JP5700005B2 - Composite magnesium alloy member and manufacturing method thereof - Google Patents

Composite magnesium alloy member and manufacturing method thereof Download PDF

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JP5700005B2
JP5700005B2 JP2012194953A JP2012194953A JP5700005B2 JP 5700005 B2 JP5700005 B2 JP 5700005B2 JP 2012194953 A JP2012194953 A JP 2012194953A JP 2012194953 A JP2012194953 A JP 2012194953A JP 5700005 B2 JP5700005 B2 JP 5700005B2
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magnesium alloy
alloy
alloy composition
composition
cast
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JP2014051688A (en
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川畑　博之
博之 川畑
加藤　元
元 加藤
岩田　靖
靖 岩田
勇 上田
勇 上田
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Toyota Central R&D Labs Inc
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    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22F—CHANGING THE PHYSICAL STRUCTURE OF NON-FERROUS METALS AND NON-FERROUS ALLOYS
    • C22F1/00—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working
    • C22F1/06—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working of magnesium or alloys based thereon
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D21/00—Casting non-ferrous metals or metallic compounds so far as their metallurgical properties are of importance for the casting procedure; Selection of compositions therefor
    • B22D21/002—Castings of light metals
    • B22D21/007—Castings of light metals with low melting point, e.g. Al 659 degrees C, Mg 650 degrees C
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C23/00—Alloys based on magnesium
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C23/00—Alloys based on magnesium
    • C22C23/02—Alloys based on magnesium with aluminium as the next major constituent

Description

本発明は、合金組成の異なるマグネシウム合金が融合してなる複合マグネシウム合金部材とその製造方法等に関する。   The present invention relates to a composite magnesium alloy member obtained by fusing magnesium alloys having different alloy compositions, a method for producing the same, and the like.

マグネシウム（Ｍｇ）は、実用金属中で最も軽量で比強度に優れ、資源も豊富である。軽量化や環境負荷の低減等が強く求められる昨今、マグネシウムは有望な金属材料であり、各種製品にマグネシウム合金が使用されつつある。   Magnesium (Mg) is the lightest and most specific metal in practical metals and has abundant resources. Recently, magnesium is a promising metal material, and weight reduction and reduction of environmental load are strongly demanded. Magnesium alloys are being used in various products.

マグネシウム合金はその合金組成により特性が異なり、各製品に適した合金組成が選択されてきた。もっとも、これまでのマグネシウム合金製品は、全体が同じ合金組成からなるか、強度や剛性等の必要な部位に鉄鋼材等からなる異種部材（被鋳込材）を鋳込んだ鋳込み部材（複合部材）であった。後者の鋳込み部材については、例えば、下記の特許文献に関連した記載がある。   Magnesium alloys have different characteristics depending on the alloy composition, and an alloy composition suitable for each product has been selected. However, conventional magnesium alloy products have the same alloy composition as a whole, or cast members (composite members) in which dissimilar members (casting materials) made of steel materials are cast in the necessary parts such as strength and rigidity. )Met. About the latter casting member, there exists description relevant to the following patent document, for example.

特開平９−１８３３７９号公報JP-A-9-183379

特許文献１にあるような鋳込み部材は、被鋳込材（鉄鋼材）と鋳造材（マグネシウム合金）の接合界面に剥離等が生じ易く、液密性や気密性等が要求される製品には用いることができない。また、その鋳込み部材では、被鋳込材へ予め抜け止め溝等を機械加工で形成しておかなければならず、製造コストが高くなる。   The cast member as in Patent Document 1 is easily peeled off at the joint interface between the cast material (steel material) and the cast material (magnesium alloy), and is required for products that require liquid-tightness or airtightness. Cannot be used. Further, in the cast member, it is necessary to form a retaining groove or the like in the cast material in advance by machining, which increases the manufacturing cost.

本発明は、このような事情に鑑みてなされたものであり、従来の鋳込み部材等とは異なり、合金組成の異なるマグネシウム合金同士が一体化した複合マグネシウム合金部材とその製造方法を提供することを目的とする。   The present invention has been made in view of such circumstances, and unlike a conventional cast member or the like, provides a composite magnesium alloy member in which magnesium alloys having different alloy compositions are integrated and a method for producing the same. Objective.

本発明者はこの課題を解決すべく鋭意研究し、試行錯誤を重ねた結果、高耐熱性のマグネシウム合金部材（被鋳込材）を高鋳造性のマグネシウム合金溶湯で鋳込むことにより、耐熱性および鋳造性を備えた複合マグネシウム合金鋳物を得ることに成功した。この複合マグネシウム合金鋳物は、被鋳込材と鋳造材との間に明瞭な接合界面がなく、両者が連続的に融合した状態となっていることがわかった。この成果を発展させることにより、以降に述べる本発明を完成するに至った。   As a result of extensive research and trial and error, the present inventor has conducted heat and heat resistance by casting a highly heat-resistant magnesium alloy member (cast material) with a highly cast magnesium alloy melt. And we succeeded in obtaining a composite magnesium alloy casting with castability. It was found that this composite magnesium alloy casting had no clear joint interface between the cast material and the cast material, and the two were continuously fused. By developing this result, the present invention described below has been completed.

《複合マグネシウム合金部材》
（１）本発明の複合マグネシウム合金部材は、第一合金組成を有する第一マグネシウム合金からなる第一部と、該第一合金組成と異なる第二合金組成を有する第二マグネシウム合金からなる第二部と、該第一合金組成と該第二合金組成の中間合金組成を有する中間マグネシウム合金からなり、該第一部と該第二部に融合して隣接する該第一部と該第二部の境界となる境界部とからなり、該第一合金組成は、全体を１００質量％（単に「％」という。）としたときに、Ａｌ：５〜１８％、Ｃａ：１〜１２％、残部：Ｍｇおよび不可避不純物からなり、該第二合金組成は、全体を１００％としたときに、Ａｌ：２．５〜１５％、残部：Ｍｇおよび不可避不純物からなることを特徴とする。 《Composite magnesium alloy member》
(1) The composite magnesium alloy member of the present invention includes a first part made of a first magnesium alloy having a first alloy composition and a second part made of a second magnesium alloy having a second alloy composition different from the first alloy composition. And an intermediate magnesium alloy having an intermediate alloy composition of the first alloy composition and the second alloy composition, the first part and the second part adjacent to each other by fusing to the first part and the second part The first alloy composition is composed of Al: 5 to 18%, Ca: 1 to 12%, and the balance when the whole is 100% by mass (simply referred to as “%”). : consists Mg and unavoidable impurities, wherein the second alloy composition, when the entirety is taken as 100%, Al: 2.5 to 15%, the balance: it made of Mg and unavoidable impurities It is characterized by.

（２）本発明の複合マグネシウム合金部材（適宜「複合部材」という。）は、合金組成の異なるマグネシウム合金が境界部を介して一体化したものである。この本発明の複合部材によれば、従来の単一合金組成からなるマグネシウム合金部材とは異なり、部位によって異なる特性を発現させることができる。例えば、鋳造性に優れるマグネシウム合金で大部分を構成して生産性を確保しつつ、高温強度等が要求される部位は耐熱性に優れるマグネシウム合金で構成することができる。 (2) The composite magnesium alloy member of the present invention (referred to as “composite member” as appropriate) is obtained by integrating magnesium alloys having different alloy compositions via a boundary portion. According to the composite member of the present invention, different from the conventional magnesium alloy member having a single alloy composition, different characteristics can be developed depending on the part. For example, a portion requiring high-temperature strength or the like can be made of a magnesium alloy having excellent heat resistance while the majority is made of a magnesium alloy having excellent castability to ensure productivity.

従って本発明によれば、適切なマグネシウム合金を適所に配置でき、機械的特性の向上等のみならず、原料コストの削減、鋳造性等の生産性の向上などを図れる複合部材が得られる。勿論、本発明の複合部材は、全体がマグネシウム合金からなるため、軽量性が損なわれることはなく、熱処理や機械加工等も従来と同様に行え、廃棄時のリサイクル性等も良好である。   Therefore, according to the present invention, it is possible to obtain a composite member that can arrange an appropriate magnesium alloy at an appropriate place and can improve not only the mechanical characteristics but also the raw material cost and the productivity such as castability. Of course, since the composite member of the present invention is entirely made of a magnesium alloy, the lightness is not impaired, heat treatment, machining, etc. can be performed in the same manner as before, and the recyclability at the time of disposal is also good.

ところで、隣接する第一部と第二部の間にある本発明に係る境界部は、第一部を構成する第一マグネシウム合金と第二部を構成する第二マグネシウム合金が融合したものであり、圧着や接着等による接合部とは異なる。具体的にいうと、境界部は、第一マグネシウム合金（第一合金組成）と第二マグネシウム合金（第二合金組成）の中間合金組成を有する中間マグネシウム合金からなる。この中間マグネシウム合金は、通常、第一マグネシウム合金から第二マグネシウム合金にかけて合金組成が連続的または傾斜的に変化したものである。逆にいうと、本発明に係る境界部は、合金組成や組織等が急変する明瞭な界面からなるものではない。このため本発明に係る境界部は、隣接するマグネシウム合金間で合金組成が比較的緩やかに変化する境界領域（幅が数〜数十μｍ程度）から構成される。このような境界部によって第一部と第二部が一体化している状態を本明細書では「融合」といっている。   By the way, the boundary part according to the present invention between the adjacent first part and the second part is a fusion of the first magnesium alloy constituting the first part and the second magnesium alloy constituting the second part. It is different from the joint by crimping or bonding. Specifically, the boundary portion is made of an intermediate magnesium alloy having an intermediate alloy composition of a first magnesium alloy (first alloy composition) and a second magnesium alloy (second alloy composition). This intermediate magnesium alloy is usually one in which the alloy composition changes continuously or in a gradient from the first magnesium alloy to the second magnesium alloy. In other words, the boundary according to the present invention does not consist of a clear interface where the alloy composition, structure, etc. change suddenly. For this reason, the boundary part which concerns on this invention is comprised from the boundary area | region (a width | variety is about several to several dozen micrometer) from which an alloy composition changes comparatively gradually between adjacent magnesium alloys. A state in which the first part and the second part are integrated by such a boundary part is referred to as “fusion” in the present specification.

いずれにしても、本発明の複合部材は、合金組成の異なるマグネシウム合金が、まるで一つのマグネシウム合金塊であるように連続的に一体化してなる。このため、従来の鋳込み部材とは異なり、境界部で剥離、液漏れ等が生じることはない。また、境界部の両側は同種金属（マグネシウム合金同士）からなるため、基本的に、異種金属間で形成され易い金属間化合物（晶出物や析出物）等がその境界部に形成されることもなく、境界部が破壊起点等になることもない。さらに、本発明に係る第一部と第二部は、境界部で一体的に融合しているため、第一部と第二部の間における熱伝導性や導電性等も良好である。   In any case, the composite member of the present invention is formed by continuously integrating magnesium alloys having different alloy compositions as if they were one magnesium alloy lump. For this reason, unlike the conventional cast member, peeling, liquid leakage, etc. do not occur at the boundary. In addition, since both sides of the boundary portion are made of the same metal (magnesium alloys), basically, intermetallic compounds (crystallized products and precipitates) that are easily formed between different metals are formed at the boundary portion. In addition, the boundary portion does not become a starting point of destruction. Furthermore, since the 1st part and 2nd part which concern on this invention are united integrally in the boundary part, the heat conductivity, electroconductivity, etc. between 1st part and 2nd part are also favorable.

《複合マグネシウム合金部材の製造方法》
（１）上述した複合マグネシウム合金部材は、その製法を問わないが、例えば、次のような本発明の製造方法により容易に得られる。すなわち、本発明の複合マグネシウム合金部材の製造方法は、第一合金組成を有する第一マグネシウム合金からなる被鋳込材を金型のキャビティ内に配置する配置工程と、該キャビティへ液相線温度が該第一マグネシウム合金より高い第二合金組成を有する第二マグネシウム合金からなる溶湯を注湯する注湯工程と、該溶湯を冷却凝固させて 該被鋳込材が該第二マグネシウム合金からなる鋳造材により鋳込まれた複合マグネシウム合金部材を得る凝固工程と、を備えることを特徴とする。 << Production Method of Composite Magnesium Alloy Member >>
(1) Although the manufacturing method is not ask | required, the composite magnesium alloy member mentioned above is easily obtained by the manufacturing method of the following this invention, for example. That is, the method for producing a composite magnesium alloy member of the present invention includes an arrangement step in which a casting material made of a first magnesium alloy having a first alloy composition is placed in a cavity of a mold, and a liquidus temperature in the cavity. Pouring a molten metal composed of a second magnesium alloy having a higher second alloy composition than the first magnesium alloy, and cooling and solidifying the molten metal so that the material to be cast is composed of the second magnesium alloy. And a solidifying step of obtaining a composite magnesium alloy member cast by a cast material.

（２）本発明の製造方法によれば、被鋳込材を構成する第一マグネシウム合金の液相線温度が、溶湯を構成する第二マグネシウム合金の液相線温度よりも低いため、注湯工程から凝固工程にかけて、被鋳込材の表面近傍で溶融した第一マグネシウム合金と第二マグネシウム合金の溶湯が混在した状態となる。この部分がその状態のまま凝固することにより、被鋳込材と鋳造材が融合して接合された状態となり、上述した本発明の複合マグネシウム合金部材が得られる。 (2) According to the manufacturing method of the present invention, since the liquidus temperature of the first magnesium alloy constituting the cast material is lower than the liquidus temperature of the second magnesium alloy constituting the molten metal, From the process to the solidification process, a molten state of the first magnesium alloy and the second magnesium alloy melted in the vicinity of the surface of the material to be cast is mixed. By solidifying this portion as it is, the cast material and the cast material are fused and joined, and the above-described composite magnesium alloy member of the present invention is obtained.

なお、本発明の製造方法では、被鋳込材の形態、キャビティの形状、鋳造条件等は問わない。また、注湯工程前に、被鋳込材の少なくとも一部を加熱して、被鋳込材と鋳造材の間に形成される接合部（境界部）の形態を調整してもよい。さらに、凝固工程後に得られた複合マグネシウム合金部材へ、別途、熱処理や塑性加工等の後工程を少なくとも一つ施してもよい。   In addition, in the manufacturing method of this invention, the form of a to-be-casting material, the shape of a cavity, casting conditions, etc. are not ask | required. Moreover, you may adjust the form of the junction part (boundary part) formed between a to-be-casting material and a casting material by heating at least one part of a to-be-casting material before a pouring process. Further, at least one post-process such as heat treatment or plastic working may be separately performed on the composite magnesium alloy member obtained after the solidification process.

《その他》
（１）本明細書でいう「マグネシウム合金部材」には、鋳物製品（鋳造のままでも、それに熱処理や加工を加えたものでもよい）の他、インゴット、バルク材、棒状、管状、板状等の素材も含まれる。「鋳物」は、その鋳造方法を問わず、重力鋳造でも加圧鋳造（ダイカスト鋳造等）でもよく、鋳型は金型でも砂型でもよい。 <Others>
(1) The “magnesium alloy member” as used in the present specification includes cast products (as cast or may be heat-treated or processed), ingots, bulk materials, rods, tubes, plates, etc. Is also included. The “cast” may be gravity casting or pressure casting (such as die casting) regardless of the casting method, and the mold may be a mold or a sand mold.

（２）本明細書でいう「第一」、「第二」は、本発明を説明するための便宜的な表記に過ぎず、境界部を挟んで隣接するマグネシウム合金は二種に限らず、三種以上でもよい。例えば、合金組成の異なる第一マグネシウム合金と第二マグネシウム合金が第一境界部により融合しており、合金組成の異なる第二マグネシウム合金と第三マグネシウム合金が第二境界部により融合している場合でもよい。 (2) The “first” and “second” in the present specification are merely a convenient notation for explaining the present invention, and the magnesium alloys adjacent to each other across the boundary are not limited to two types. Three or more types may be used. For example, when a first magnesium alloy and a second magnesium alloy having different alloy compositions are fused at the first boundary, and a second magnesium alloy and a third magnesium alloy having different alloy compositions are fused at the second boundary. But you can.

（３）本明細書中でいう「改質元素」は、Ａｌ、Ｃａなどの他、Ｚｎ、Ｍｎ、Ｒ.Ｅ.（希土類元素）、Ｂｅ、Ｓｎ、Ｓｉ、Ｓｒ、Ｂｉ、Ｚｒ等であって、マグネシウム合金の特性改善に有効な元素である。改善される特性の種類は問わないが、強度、靱性、延性、耐熱性、鋳造性などがある。各元素の組合せは任意であり、通常その含有量は微量である。また「不可避不純物」は、Ｃｕ、Ｎｉ、Ｆｅ等であって、原料中に含まれる不純物や製造工程時に混入等する不純物などであって、コスト的または技術的に除去困難な元素である。 (3) The “reforming element” in the present specification includes Al, Ca and the like, Zn, Mn, RE (rare earth element), Be, Sn, Si, Sr, Bi, Zr and the like. Thus, it is an effective element for improving the characteristics of magnesium alloys. There are no limitations on the types of properties to be improved, but there are strength, toughness, ductility, heat resistance, castability and the like. The combination of each element is arbitrary, and its content is usually very small. Further, “inevitable impurities” are Cu, Ni, Fe, and the like, which are impurities contained in the raw material, impurities mixed in during the manufacturing process, and the like, and are elements that are difficult to remove in terms of cost or technology.

（４）特に断らない限り本明細書でいう「ｘ〜ｙ」は下限値ｘおよび上限値ｙを含む。本明細書に記載した種々の数値または数値範囲に含まれる任意の数値を新たな下限値または上限値として「ａ〜ｂ」のような範囲を新設し得る。 (4) Unless otherwise specified, “x to y” in this specification includes a lower limit value x and an upper limit value y. A range such as “a to b” can be newly established with any numerical value included in various numerical values or numerical ranges described in the present specification as a new lower limit value or upper limit value.

試料１に係る複合部材の接合部（境界部）およびその近傍を示す金属組織写真である。2 is a metallographic photograph showing a joint part (boundary part) of the composite member according to Sample 1 and its vicinity. 試料Ｃ１に係る複合部材の接合部（界面）およびその近傍を示す金属組織写真である。It is a metallographic photograph which shows the junction part (interface) of the composite member concerning sample C1, and its neighborhood. 試料Ｃ２に係る複合部材の接合部（境界層）およびその近傍を示す金属組織写真である。It is a metallographic photograph which shows the junction part (boundary layer) of the composite member which concerns on the sample C2, and its vicinity.

発明の実施形態を挙げて本発明をより詳しく説明する。本明細書で説明する内容は、複合マグネシウム合金部材のみならず、その製造方法にも適宜適用される。製造方法に関する構成要素は、プロダクトバイプロセスクレームとして理解すれば物に関する構成要素ともなり得る。上述した本発明の構成要素に、本明細書中から任意に選択した一つまたは二つ以上の構成要素を付加し得る。いずれの実施形態が最良であるか否かは、対象、要求性能等によって異なる。   The present invention will be described in more detail with reference to embodiments of the invention. The contents described in the present specification are appropriately applied not only to the composite magnesium alloy member but also to the manufacturing method thereof. A component related to a manufacturing method can be a component related to an object if understood as a product-by-process claim. One or two or more components arbitrarily selected from the present specification may be added to the above-described components of the present invention. Which embodiment is the best depends on the target, required performance, and the like.

《合金組成》
（１）本発明に係る境界部が形成される限り、隣接するマグネシウム合金の合金組成は問わない。もっとも、本発明者の研究により、隣接するマグネシウム合金の液相線温度差が一定以上であるときに、良好な境界部が形成されることがわかっている。例えば、隣接するマグネシウム合金は、第一マグネシウム合金の液相線温度（ＴＬ１）と第二マグネシウム合金の液相線温度（ＴＬ２）との温度差（｜ＴＬ１−ＴＬ２｜）が１０℃以上、１５℃以上、３０℃以上さらには４０℃以上となる合金組成（第一合金組成と第二合金組成）であると好ましい。なお、いうまでもないが、本明細書でいう液相線温度は合金組成に応じて状態図から定まる温度であって、当該合金が完全に溶解する最小温度である。 <Alloy composition>
(1) As long as the boundary part which concerns on this invention is formed, the alloy composition of an adjacent magnesium alloy is not ask | required. However, the study of the present inventor has shown that a good boundary is formed when the liquidus temperature difference between adjacent magnesium alloys is a certain level or more. For example, in the adjacent magnesium alloy, the temperature difference (| TL1-TL2 |) between the liquidus temperature (TL1) of the first magnesium alloy and the liquidus temperature (TL2) of the second magnesium alloy is 10 ° C. or more, 15 It is preferable that the alloy composition (first alloy composition and second alloy composition) is at least 30 ° C., at least 30 ° C., and even at least 40 ° C. Needless to say, the liquidus temperature in the present specification is a temperature determined from a phase diagram according to the alloy composition, and is the minimum temperature at which the alloy is completely dissolved.

このような液相線温度差を生じる限り、具体的な合金組成は問わないが、例えば、第一合金組成は、全体を１００質量％（単に「％」という。）としたときに、Ａｌ：５〜１８％、Ｃａ：１〜１２％、残部：Ｍｇおよび改質元素若しくは不可避不純物からなると好ましい。この合金組成を有するマグネシウム合金は、高価な希少元素等を用いるまでもなくＣａにより優れた耐熱性を発現し、また、その液相線温度（ＴＬ１）を相対的に低くする。合金組成によるが、その液相線温度は５３０〜６００℃程度となる。   The specific alloy composition is not limited as long as such a liquidus temperature difference is generated. For example, when the total composition of the first alloy is 100 mass% (simply referred to as “%”), Al: It is preferable that it consists of 5 to 18%, Ca: 1 to 12%, balance: Mg and modifying elements or inevitable impurities. A magnesium alloy having this alloy composition exhibits excellent heat resistance with Ca without using expensive rare elements and the like, and relatively lowers its liquidus temperature (TL1). Although it depends on the alloy composition, the liquidus temperature is about 530 to 600 ° C.

また第二合金組成は、全体を１００％としたときに、Ａｌ：２．５〜１５％、残部：Ｍｇおよび改質元素若しくは不可避不純物からなると好ましい。この合金組成を有するマグネシウム合金は、汎用性があり鋳造性に優れ、マグネシウム合金製品をダイカスト等によって効率的に低コストで生産できる。その液相線温度（ＴＬ２）は相対的に高く、合金組成によるが５８０〜６４０℃程度となる。   Further, the second alloy composition is preferably composed of Al: 2.5 to 15%, balance: Mg and a modifying element or inevitable impurities when the whole is taken as 100%. A magnesium alloy having this alloy composition has versatility and excellent castability, and a magnesium alloy product can be efficiently produced at low cost by die casting or the like. The liquidus temperature (TL2) is relatively high and is about 580 to 640 ° C. depending on the alloy composition.

（２）境界部を構成する中間マグネシウム合金は、上述した第一合金組成と第二合金組成の中間である中間合金組成からなる限り、その具体的な合金組成を問わない。中間合金組成は、通常、一定ではなく、第一合金組成と第二合金組成を上下限とする範囲内で変化する。ちなみに、本明細書でいう合金組成は、金属組織を構成するミクロ的（局所的な）な領域の合金組成ではなく、ある程度の広がりをもつマクロ的な領域の合金組成である。なお、境界部の合金組成や幅は、液相線温度（ＴＬ１、ＴＬ２）、複合部材の製造条件（溶湯温度、溶湯保持時間、凝固速度等）により調整可能である。 (2) As long as the intermediate magnesium alloy which comprises a boundary part consists of the intermediate alloy composition which is the intermediate | middle of the 1st alloy composition and the 2nd alloy composition mentioned above, the specific alloy composition is not ask | required. The intermediate alloy composition is usually not constant and varies within a range where the upper and lower limits are the first alloy composition and the second alloy composition. Incidentally, the alloy composition referred to in this specification is not an alloy composition in a microscopic (local) region constituting a metal structure, but an alloy composition in a macroscopic region having a certain extent. Note that the alloy composition and width of the boundary can be adjusted by the liquidus temperature (TL1, TL2) and the manufacturing conditions of the composite member (molten metal temperature, molten metal holding time, solidification rate, etc.).

《用途》
本発明の複合部材は、その用途を問わない。もっとも、本発明の複合部材は、部位により要求される特性が異なる部材に適している。例えば、他部材と連結される部位のみに耐熱性や強度が要求される各種のケースや容器等である。 <Application>
The composite member of the present invention may be used for any purpose. But the composite member of this invention is suitable for the member from which the characteristic requested | required by a site | part differs. For example, there are various cases and containers in which heat resistance and strength are required only for a portion connected to another member.

《試料の製造》
表１に示すように、種々の合金組成（第一合金組成）からなる被鋳込材を、それとは異なる合金組成（第二合金組成）からなる鋳造材で鋳込んだ複合部材を複数製造し、これらを試料とした。 <Production of sample>
As shown in Table 1, a plurality of composite members were produced by casting a material to be cast having various alloy compositions (first alloy composition) with a cast material having a different alloy composition (second alloy composition). These were used as samples.

被鋳込材は、鋼舟型で重力鋳造して得られた鋳塊から切り出した円柱状片（φ２０×１０ｍｍ）である。なお、鋳造時の溶湯調製には、市販されている合金または純金属を原料とした。これは後述する鋳造材についても同様である。表１の合金組成欄に示した記号は、各合金組成を示すＡＳＴＭ規格またはＪＩＳ規格である。   The material to be cast is a cylindrical piece (φ20 × 10 mm) cut out from an ingot obtained by gravity casting with a steel boat mold. Note that a commercially available alloy or pure metal was used as a raw material for the melt preparation at the time of casting. The same applies to the cast material described later. The symbols shown in the alloy composition column of Table 1 are ASTM standards or JIS standards indicating the respective alloy compositions.

上記の円柱状片を、円筒形状（φ５０×３０ｍｍ）のキャビティを有するダイキャスト金型の中央部にセットした（配置工程）。このキャビティへ、表１に示した鋳造材の溶湯を、同表に示す溶湯温度で注湯した（注湯工程）。この後、金型を冷却し、その鋳造材を凝固させることにより円柱状片を鋳込んだ複合部材を得た（凝固工程）。   The columnar piece was set in the center of a die-cast mold having a cylindrical (φ50 × 30 mm) cavity (arrangement step). The cast metal melt shown in Table 1 was poured into this cavity at the melt temperature shown in the same table (pouring process). Then, the metal mold | die was cooled and the cast material was solidified, and the composite member which cast the cylindrical piece was obtained (solidification process).

この際のダイカスト条件は、射出速度：０．４ｍ／ｓ、射出圧力：６４ＭＰａとした。   The die casting conditions at this time were injection speed: 0.4 m / s and injection pressure: 64 MPa.

《観察》
得られた複合部材の中央部を切断し、その切断面を光学顕微鏡により組織観察した。これにより得られた被鋳込材と鋳造材の接合部を示す金属組織写真を図１Ａ〜図１Ｃに示した。なお、試料２の金属組織は試料１の金属組織（図１Ａ）とほぼ同様な形態であった。 << Observation >>
The center part of the obtained composite member was cut, and the cut surface was observed with an optical microscope. The metal structure photograph which shows the to-be-cast material obtained by this and the junction part of a cast material was shown to FIG. 1A-FIG. 1C. Note that the metal structure of Sample 2 was almost the same as the metal structure of Sample 1 (FIG. 1A).

《評価》
図１Ａ（試料１）からわかるように、液相線温度が低い被鋳込材（第一マグネシウム合金／第一部）を、それよりも液相線温度が高い鋳造材（第二マグネシウム合金／第二部）で鋳込むと、ある幅の領域内で両マグネシウム合金が融合し、連続的に合金組成が変化した溶融接合部（境界部）が形成されることが確認できた。 <Evaluation>
As can be seen from FIG. 1A (sample 1), a casting material having a low liquidus temperature (first magnesium alloy / first part) is casted with a casting material having a higher liquidus temperature (second magnesium alloy / When casting was performed in the second part), it was confirmed that both magnesium alloys were fused within a certain width region, and a melt-bonded part (boundary part) in which the alloy composition was continuously changed was formed.

一方、図１Ｂ（試料Ｃ１）からわかるように、被鋳込材と鋳造材がマグネシウム合金同士でも、被鋳込材の液相線温度が鋳造材の液相線温度よりも高いと、非融合的な未溶融接合部（界面）が形成されることがわかった。また表１から明らかなように、鋳込み時の鋳造材の溶湯温度が、被鋳込材の液相線温度よりも高いときでも、図１Ｂに示すような金属組織となることもわかった。なお、このことから、溶湯温度が被鋳込材の液相線温度よりも低いとき、接合部の金属組織は当然に図１Ｂと同様なものになると考えられる。   On the other hand, as can be seen from FIG. 1B (sample C1), even if the cast material and the cast material are magnesium alloys, the liquidus temperature of the cast material is higher than the liquidus temperature of the cast material. It was found that a typical unmelted joint (interface) was formed. Further, as is apparent from Table 1, it was also found that the metal structure shown in FIG. 1B was obtained even when the molten metal temperature of the cast material at the time of casting was higher than the liquidus temperature of the material to be cast. From this, when the molten metal temperature is lower than the liquidus temperature of the material to be cast, it is considered that the metal structure of the joint is naturally the same as in FIG. 1B.

図１Ｃ（試料Ｃ２）から明らかなように、被鋳込材の液相線温度が鋳造材の液相線温度より低くても、両者の主成分（系統）が異なる場合、図１Ａに示すような接合部（境界部）とはならないこともわかった。そして、被鋳込材と鋳造材の接合部には、それら主成分に基づく金属間化合物（Ａｌ−Ｍｇ化合物）からなる境界層が出現することもわかった。このような境界層は、複合部材の強度を低下させる原因となる。   As is clear from FIG. 1C (sample C2), even when the liquidus temperature of the material to be cast is lower than the liquidus temperature of the casting material, when the main components (systems) of the two are different, as shown in FIG. 1A It was also found that it was not a good joint (boundary part). It was also found that a boundary layer made of an intermetallic compound (Al-Mg compound) based on these main components appears at the joint between the cast material and the cast material. Such a boundary layer causes a reduction in the strength of the composite member.

以上のことから、被鋳込材と鋳造材の間で融合的な境界部が形成される場合は限られていることが確認できた。すなわち、被鋳込材と鋳造材が共にマグネシウム合金からなり、被鋳込材の液相線温度より鋳造材の液相線温度が高い場合に本発明でいう良好な境界部が形成されることがわかった。   From the above, it has been confirmed that the case where a fusional boundary portion is formed between the cast material and the cast material is limited. That is, both the casting material and the casting material are made of a magnesium alloy, and when the liquidus temperature of the casting material is higher than the liquidus temperature of the casting material, the good boundary portion referred to in the present invention is formed. I understood.

Claims (5)

第一合金組成を有する第一マグネシウム合金からなる第一部と、
該第一合金組成と異なる第二合金組成を有する第二マグネシウム合金からなる第二部と、
該第一合金組成と該第二合金組成の中間合金組成を有する中間マグネシウム合金からなり、該第一部と該第二部に融合して隣接する該第一部と該第二部の境界となる境界部とからなり、
該第一合金組成は、全体を１００質量％（単に「％」という。）としたときに、Ａｌ：５〜１８％、Ｃａ：１〜１２％、残部：Ｍｇおよび不可避不純物からなり、
該第二合金組成は、全体を１００％としたときに、Ａｌ：２．５〜１５％、残部：Ｍｇおよび不可避不純物からなることを特徴とする複合マグネシウム合金部材。 A first portion comprising a first magnesium alloy having a first alloy composition;
A second part comprising a second magnesium alloy having a second alloy composition different from the first alloy composition;
An intermediate magnesium alloy having an intermediate alloy composition of the first alloy composition and the second alloy composition, the first part and the boundary between the first part and the second part adjacent to and fused to the second part Consisting of the boundary part
Said first alloy composition, when the total 100% by mass (simply "%".), Al: 5 to 18%, Ca: from Mg and unavoidable impurities: from 1 to 12%, the balance Become
The said second alloy composition, when the entirety is taken as 100%, Al: 2.5~15%, balance: Mg and composite magnesium alloy member, characterized in that it consists of unavoidable impurities. 前記第一合金組成と前記第二合金組成は、前記第一マグネシウム合金の液相線温度（ＴＬ１）と前記第二マグネシウム合金の液相線温度（ＴＬ２）との温度差（｜ＴＬ１−ＴＬ２｜）が１０℃以上となる組成である請求項１に記載の複合マグネシウム合金部材。   The first alloy composition and the second alloy composition are the temperature difference (| TL1-TL2 |) between the liquidus temperature (TL1) of the first magnesium alloy and the liquidus temperature (TL2) of the second magnesium alloy. 2) The composite magnesium alloy member according to claim 1, which has a composition of 10 ° C. or higher. 第一合金組成を有する第一マグネシウム合金からなる被鋳込材を金型のキャビティ内に配置する配置工程と、
該キャビティへ液相線温度が該第一マグネシウム合金より高い第二合金組成を有する第二マグネシウム合金からなる溶湯を注湯する注湯工程と、
該溶湯を冷却凝固させて該被鋳込材が該第二マグネシウム合金からなる鋳造材により鋳込まれた複合マグネシウム合金部材を得る凝固工程と、
を備えることを特徴とする複合マグネシウム合金部材の製造方法。 An arrangement step of arranging a casting material made of a first magnesium alloy having a first alloy composition in a cavity of a mold;
A pouring step of pouring a molten metal comprising a second magnesium alloy having a second alloy composition having a liquidus temperature higher than that of the first magnesium alloy into the cavity;
A solidification step of cooling and solidifying the molten metal to obtain a composite magnesium alloy member in which the material to be cast is cast with a cast material made of the second magnesium alloy;
A method for producing a composite magnesium alloy member, comprising: 前記注湯工程前に、前記被鋳込材の少なくとも一部は加熱されている請求項３に記載の複合マグネシウム合金部材の製造方法。   The method for producing a composite magnesium alloy member according to claim 3, wherein at least a part of the cast material is heated before the pouring step. さらに、前記凝固工程後の複合マグネシウム合金部材へ熱処理または塑性加工の少なくとも一方を施す請求項３または４に記載の複合マグネシウム合金部材の製造方法。   Furthermore, the manufacturing method of the composite magnesium alloy member of Claim 3 or 4 which performs at least one of heat processing or plastic working to the composite magnesium alloy member after the said solidification process.
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