JPH07278717A - Magnesium alloy member excellent in settling resistance in pressurized part - Google Patents
Magnesium alloy member excellent in settling resistance in pressurized partInfo
- Publication number
- JPH07278717A JPH07278717A JP6073348A JP7334894A JPH07278717A JP H07278717 A JPH07278717 A JP H07278717A JP 6073348 A JP6073348 A JP 6073348A JP 7334894 A JP7334894 A JP 7334894A JP H07278717 A JPH07278717 A JP H07278717A
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- Prior art keywords
- magnesium alloy
- resistance
- alloy member
- bolt fastening
- content
- Prior art date
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Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は、機械構造物の部品、例
えば、自動車用部品として利用される軽量なマグネシウ
ム合金製部材に関し、特に、高温環境で使用される加圧
部例えばボルト締結部を有するマグネシウム合金製部品
においてそのボルト締結部における耐へたり性とくに耐
熱へたり性に優れたものとすることができるマグネシウ
ム合金製部材に関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a lightweight magnesium alloy member used as a component of a machine structure, for example, an automobile component, and more particularly to a pressure portion such as a bolt fastening portion used in a high temperature environment. The present invention relates to a magnesium alloy member that can be made to have excellent settling resistance, particularly heat settling resistance, in a bolt fastening portion of the magnesium alloy component.
【０００２】[0002]
【従来の技術】従来、自動車用部品の素材に使用される
マグネシウム合金としては、例えば、ＪＩＳ Ｈ ５２
０３に制定されるマグネシウム鋳物用合金（ＭＣ １〜
ＭＣ１０）や、ＪＩＳ Ｈ ５３０３に制定されるマグ
ネシウムダイカスト用合金（ＭＤ １Ａ，ＭＤ １Ｂ）
等があるが、特に、高温環境下での材料特性に優れたマ
グネシウム合金としては、Ｍｇ−４％Ａｌ−２％ＲＥ
（希土類元素）系合金であるＡＥ４２材（米国 Ｄｏｗ
Ｃｈｅｍｉｃａｌ社）がある。2. Description of the Related Art Conventionally, as a magnesium alloy used as a material for automobile parts, for example, JIS H 52
03 Magnesium casting alloy (MC 1-
MC10) and magnesium die casting alloys (MD 1A, MD 1B) established in JIS H 5303.
In particular, as a magnesium alloy having excellent material properties under a high temperature environment, Mg-4% Al-2% RE
(Rare earth element) alloy AE42 material (US Dow
Chemical Company).
【０００３】[0003]
【発明が解決しようとする課題】しかしながら、このよ
うなＭｇ−４％Ａｌ−２％ＲＥ（希土類元素）系合金で
あるＡＥ４２材を素材として使用した部品の場合、とく
にボルト締結部を有する部品の場合に、ボルト締結部の
耐へたり性、とくに耐熱へたり性の向上に寄与すると考
えられるＣｅ化合物の分散，生成が、ダイカストのよう
な急冷による凝固形態をとらないときに、十分な耐熱へ
たり性を得ることができないという問題点があり、この
ような問題点を解決することが課題であった。However, in the case of the parts using the AE42 material which is such Mg-4% Al-2% RE (rare earth element) alloy as a raw material, especially the parts having the bolt fastening portions are used. In this case, when the Ce compound, which is considered to contribute to the improvement of the sag resistance of the bolt fastening part, particularly the heat sag resistance, does not take a solidification form such as die casting due to rapid cooling, sufficient heat resistance is achieved. However, there is a problem that it is not possible to obtain such a tendency, and it has been a problem to solve such a problem.
【０００４】[0004]
【発明の目的】本発明は、このような従来の課題にかん
がみてなされたものであって、ダイカストのような急冷
による凝固形態をとる場合のほか、このような急冷によ
る凝固形態をとらない場合をも含めて、どのような冷却
速度の鋳造方法であっても、ボルト締結部等の加圧部で
の耐へたり性、とくに高温におけるボルト締結部等の加
圧部での耐熱へたり性に優れたマグネシウム合金製部材
を提供することを目的としており、さらにまた、場合に
よっては、加圧部における耐へたり性に優れていると共
に常温での引張り特性をも向上させることができるマグ
ネシウム合金製部材を提供することを目的としている。DISCLOSURE OF THE INVENTION The present invention has been made in view of the above-mentioned conventional problems, and in addition to the case of taking a solidification form by rapid cooling such as die casting, the case of not taking such a solidification form by rapid cooling. No matter what the cooling method, including castings, the settling resistance of the pressure parts such as the bolt fastening part, especially the heat resistance settling of the pressure parts such as the bolt fastening part at high temperature. And a magnesium alloy capable of improving tensile properties at room temperature as well as having excellent settling resistance in the pressure part in some cases. The purpose is to provide a member made.
【０００５】[0005]
【課題を解決するための手段】本発明に係わる加圧部で
の耐へたり性に優れたマグネシウム合金製部材は、Ｍｇ
−Ａｌ−ＲＥ系合金においてＲＥの含有量を減らすと共
に微量ないしは少量のＣａを添加することにより、どの
ような冷却速度の鋳造方法であっても、ボルト締結部等
の加圧部における耐へたり性を向上させることができる
ようにしたものであって、重量％で、Ａｌ：１．５〜１
０．０％、ＲＥ（希土類元素の１種または２種以上）：
２．５％以下、Ｃａ：０．２〜５．５％を含み、残部Ｍ
ｇおよび不純物よりなる成分組成としたことを特徴とし
ている。MEANS TO SOLVE THE PROBLEMS A magnesium alloy member having excellent sag resistance in a pressurizing portion according to the present invention is
-By reducing the RE content and adding a trace amount or a small amount of Ca in the Al-RE alloy, no matter what the cooling speed of the casting method, the fatigue resistance in the pressurizing portion such as the bolt fastening portion In order to improve the property, Al: 1.5-1 in weight%
0.0%, RE (one or more rare earth elements):
2.5% or less, including Ca: 0.2 to 5.5%, balance M
It is characterized in that the composition is composed of g and impurities.
【０００６】また、同じく、本発明に係わる引張り特性
および加圧部での耐へたり性に優れたマグネシウム合金
製部材は、上記マグネシウム合金製部材に微量のＣｕと
Ｚｎを同時添加あるいは単独添加することにより、常温
での引張り特性を向上させることができるようにしたも
のであって、重量％で、Ａｌ：１．５〜１０．０％、Ｒ
Ｅ：２．５％以下、Ｃａ：０．２〜５．５％、およびＣ
ｕ，Ｚｎのうちの１種または２種：０．２〜２．５％を
含み、残部Ｍｇおよび不純物よりなる成分組成としたこ
とを特徴としている。Further, similarly, in the magnesium alloy member excellent in tensile properties and settling resistance in a pressure portion according to the present invention, trace amounts of Cu and Zn are added simultaneously or individually to the magnesium alloy member. As a result, the tensile properties at room temperature can be improved, and in weight%, Al: 1.5 to 10.0%, R
E: 2.5% or less, Ca: 0.2 to 5.5%, and C
One or two types of u and Zn: 0.2 to 2.5% are contained, and the composition is characterized by the balance Mg and impurities.
【０００７】そして、本発明によるマグネシウム合金製
部材の実施態様において、加圧部での耐へたり性は、温
度１００℃から１５０℃付近での耐熱へたり性であっ
て、このような耐熱へたり性に優れたものであることを
特徴としており、また、加圧部がボルト締結部であっ
て、このようなボルト締結部での耐へたり性、とくに耐
熱へたり性に優れたものであることを特徴としている。In the embodiment of the magnesium alloy member according to the present invention, the sag resistance in the pressurizing part is the heat sag resistance in the temperature range of 100 ° C. to 150 ° C. The pressurizing part is a bolt fastening part, and the settling resistance at such a bolt fastening part, especially the heat-resistant settling property is excellent. It is characterized by being.
【０００８】次に、本発明に係わる加圧部での耐へたり
性に優れたマグネシウム合金製部材の成分組成（重量
％）の限定理由について説明する。Next, the reason for limiting the component composition (% by weight) of the magnesium alloy member having excellent sag resistance in the pressurizing portion according to the present invention will be described.
【０００９】Ａｌ：１．５〜１０．０％ 図１は、ＲＥ含有量が０．９〜１．２％であるマグネシ
ウム合金の引張り特性に及ぼすＡｌ含有量の影響を調べ
た結果を示すものであり、また、図２は、ＲＥ含有量が
０％，１．０％，２．０％であるマグネシウム合金の高
温（１００℃）でのボルト締結部における耐熱へたり性
に及ぼすＡｌ含有量の影響を後の実施例において採用し
た図５（Ａ）（Ｂ）に示す要領で軸力低下率を測定する
ことにより調べた結果を示すものであって、図２に示す
ように、Ａｌ含有量が４．０％付近でボルト締結部の熱
へたり（軸力低下率）は最小となるが、図１に示すよう
に、Ａｌ含有量が約６％で引張り強さが最大となり、約
６％よりも少なくなると引張り強さが低下し、４．０％
以下でさらに低下し、１．５％未満では実用的でなくな
る。Al: 1.5-10.0% FIG. 1 shows the results of examining the effect of Al content on the tensile properties of magnesium alloys with RE content of 0.9-1.2%. In addition, FIG. 2 shows that the Al content that affects the heat-resistant fatigue resistance in the bolt fastening portion of the magnesium alloy having RE contents of 0%, 1.0%, and 2.0% at high temperature (100 ° C.). Fig. 5 shows the results of examining the influence of the above by measuring the axial force reduction rate according to the procedure shown in Figs. 5 (A) and 5 (B) adopted in later examples. When the amount is around 4.0%, the heat settling (axial force reduction rate) of the bolt fastening part is minimum, but as shown in Fig. 1, the Al content is about 6% and the tensile strength is maximum, When it is less than 6%, the tensile strength decreases and it becomes 4.0%.
If it is less than 1.5%, it becomes unpractical.
【００１０】そして、Ａｌ含有量を増加させていくと、
引張り強さは約６％まで増加の傾向を示し、１０．０％
までは耐力も増加するが、引張り強さはむしろ低下して
くる。また、この傾向は、ＲＥ含有量が２．５％以下の
範囲で確認された。したがって、このような理由から、
Ａｌ含有量は１．５〜１０．０％、より好ましくは２．
０〜８．０％の範囲とするのが良い。Then, when the Al content is increased,
Tensile strength tends to increase up to about 6%, 10.0%
Although the proof stress increases, the tensile strength rather decreases. Further, this tendency was confirmed in the range where the RE content was 2.5% or less. Therefore, for this reason,
The Al content is 1.5 to 10.0%, more preferably 2.
It is preferable to set it in the range of 0 to 8.0%.
【００１１】ＲＥ（希土類元素のうちから選ばれる１種
または２種以上の合計）：２．５％以下 ＲＥは、添加量を多くする方が、高温でのボルト締結部
等の加圧部における耐熱へたり性を改善する効果が大き
いことが確認された。そして、２．０％以上含有させた
ときにボルト締結部等の加圧部における耐熱へたり性の
向上に寄与すると考えられるＣｅ化合物を分散，生成さ
せるためには、ダイカストのような急冷による凝固形態
をとる鋳造方法を用いる必要がある。もちろん、本発明
ではダイカストを用いることは可能であるのでＲＥ含有
量を２．５％以下としている。RE (total of one or more selected from rare earth elements): 2.5% or less RE is more in the pressurizing portion such as a bolt fastening portion at high temperature as the addition amount is increased. It was confirmed that the effect of improving the heat settling property is great. Then, in order to disperse and generate the Ce compound which is considered to contribute to the improvement of the heat resistance settling property in the pressurizing portion such as the bolt fastening portion when it is contained at 2.0% or more, solidification by rapid cooling such as die casting is performed. It is necessary to use a morphological casting method. Of course, in the present invention, it is possible to use die casting, so the RE content is set to 2.5% or less.
【００１２】したがって、ＲＥ含有量は２．０％以下で
添加されることが好ましく、１．０％ぐらいが最適であ
る。また、２．０％以上では歩留まりが悪くなるととも
に、ＲＥの多量添加は最終的にコストは高くなるが、Ｒ
Ｅを２．０％以上添加したうえで、さらに微量ないしは
少量のＣａを添加しても高温でのボルト締結部等の加圧
部における耐熱へたり性を改善する効果が確認できた。
このような理由により、ＲＥの含有量を２．５％以下、
より好ましくは０．５〜２．０％の範囲とするのが良
い。Therefore, the RE content is preferably 2.0% or less, and optimally about 1.0%. Further, when the content is 2.0% or more, the yield becomes poor, and addition of a large amount of RE ultimately increases the cost, but R
It has been confirmed that even if a small amount or a small amount of Ca is added after adding E in an amount of 2.0% or more, the effect of improving the heat resistance settling property in the pressurizing portion such as the bolt fastening portion at high temperature is improved.
For this reason, the RE content is 2.5% or less,
It is more preferable to set it in the range of 0.5 to 2.0%.
【００１３】Ｃａ：０．２〜５．５％ 図３は、ＲＥ含有量が０．９〜１．２％であるマグネシ
ウム合金の引張り特性に及ぼすＣａ含有量の影響を調べ
た結果を示すものであり、また、図４は、ＲＥ含有量が
１．０％，２．０％であるマグネシウム合金の高温（１
００℃）でのボルト締結部における耐熱へたり性に及ぼ
すＣａ含有量の影響を後の実施例において採用した図５
（Ａ）（Ｂ）に示す要領で軸力低下率を測定することに
より調べた結果を示すものであって、図４に示すよう
に、Ｃａは少量添加した場合であっても高温でのボルト
締結部の耐熱へたり性を改善するが、０．２％未満では
その特性はあまり改善されない。そして、Ｃａ含有量を
さらに増加させていくと高温でのボルト締結部の耐熱へ
たり性はさらに改善され、０．５０〜０．７５％で最も
改善される特性を示し、１％を超え６％ぐらいまではそ
の効果を示すが、図３に示すように、５．５％を超える
と靭性（伸び）が劣るものとなり、鋳造時には鋳造割れ
も発生するようになるので実用的でなくなる。また、こ
の傾向は、ＲＥ含有量が２．５％以下の範囲で確認され
た。したがって、このような理由から、Ｃａの含有量を
０．２〜５．５％、より好ましくは０．２〜４．０％の
範囲とするのが良い。Ca: 0.2-5.5% FIG. 3 shows the results of examining the effect of Ca content on the tensile properties of magnesium alloys with RE content of 0.9-1.2%. In addition, FIG. 4 shows that the high temperature (1
The effect of the Ca content on the heat settling resistance of the bolt fastening part at 00 ° C) was adopted in the subsequent examples.
The results obtained by measuring the axial force reduction rate in the manner shown in (A) and (B) are shown. As shown in FIG. 4, even when a small amount of Ca is added, bolts at high temperature are shown. Although the heat resistance of the fastening portion is improved, if it is less than 0.2%, the characteristics are not improved so much. When the Ca content is further increased, the heat-resistant fatigue resistance of the bolted portion at high temperature is further improved, showing the most improved property at 0.50 to 0.75%, and exceeding 6% exceeds 6%. %, The effect is exhibited, but as shown in FIG. 3, if it exceeds 5.5%, the toughness (elongation) becomes inferior, and casting cracks also occur during casting, which is not practical. Further, this tendency was confirmed in the range where the RE content was 2.5% or less. Therefore, for such a reason, the Ca content is preferably in the range of 0.2 to 5.5%, more preferably 0.2 to 4.0%.
【００１４】Ｃｕ，Ｚｎのうちの１種または２種：０．
２〜２．５％ Ｃｕ，Ｚｎは、Ｃａ含有量が少ない場合に、常温でのマ
グネシウム合金製部材の引張り特性を向上させるために
適宜添加することができる元素であり、０．２〜２．５
％の範囲で複合添加あるいは単独添加した場合にその効
果を発揮するが、２．５％超過ではその効果が失われる
ので、０．２〜２．５％の範囲とするのが良い。また、
１５０℃でのボルト締結部における耐熱へたり性評価か
らも同様なことがいえる。One or two of Cu and Zn: 0.
2 to 2.5% Cu and Zn are elements that can be appropriately added to improve the tensile properties of the magnesium alloy member at room temperature when the Ca content is low, and 0.2 to 2. 5
The effect is exhibited in the case of composite addition or single addition in the range of%, but the effect is lost if it exceeds 2.5%, so the range of 0.2 to 2.5% is preferable. Also,
The same can be said from the thermal fatigue resistance evaluation at the bolt fastening portion at 150 ° C.
【００１５】このような成分組成を有するボルト締結部
等の加圧部を有するマグネシウム合金製部材は、一般的
なマグネシウム合金製自動車用部品の溶解，鋳造方法に
よって製造することができる。A magnesium alloy member having a pressurizing portion such as a bolt fastening portion having such a composition can be manufactured by a general melting and casting method of magnesium alloy automobile parts.
【００１６】例えば、Ｎｉ成分を含まないスチール製の
坩堝を使用し、ＳＦ６／ＣＯ２／Ａｉｒの混合ガスに代
表される酸化防止用のガスを用いて溶解，鋳造すること
ができる。For example, a crucible made of steel containing no Ni component can be used, and melting and casting can be performed by using an antioxidant gas represented by a mixed gas of SF 6 / CO 2 / Air.
【００１７】また、本発明に係わるボルト締結部等の加
圧部を有するマグネシウム合金製部材は、各種の鋳造方
法、例えば、砂型鋳造法，金型鋳造法，ダイカスト法，
石膏型鋳造法，等を採用することが可能であり、特に限
定はされない。Further, the magnesium alloy member having the pressurizing portion such as the bolt fastening portion according to the present invention can be subjected to various casting methods, for example, a sand casting method, a die casting method, a die casting method,
It is possible to adopt a plaster-type casting method or the like, and there is no particular limitation.
【００１８】[0018]
【発明の作用】本発明によるボルト締結部等の加圧部を
有するマグネシウム合金製部材は、重量％で、Ａｌ：
１．５〜１０．０％、ＲＥ：２．５％以下、Ｃａ：０．
２〜５．５％を含み、残部Ｍｇおよび不純物の成分組成
よりなっているものであり、ＲＥ含有量を減らすととも
に、微量ないしは少量のＣａを添加するものとなってい
るので、Ｃｅ化合物が樹枝状晶の間隙に連続した形態で
晶出したものとなっていて、これが、変形の際にすべり
を発生しにくくして加圧部での耐へたり性、とくに高温
において加圧部での耐熱へたり性が改善されたものとな
る。また、１００℃〜１５０℃での特性が優れることに
より、１５０℃を超える温度でも優れる特性であること
はいうまでもない。The magnesium alloy member having the pressurizing portion such as the bolt fastening portion according to the present invention has a weight percentage of Al:
1.5 to 10.0%, RE: 2.5% or less, Ca: 0.
2 to 5.5%, the composition of the balance Mg and impurities, and the composition of the Ce compound because it reduces the RE content and adds a trace amount or a small amount of Ca. It is crystallized in a continuous form in the interstices of the crystalline crystals, which is less likely to cause slip during deformation and is resistant to settling at the pressure part, especially at high temperatures. The sagging property is improved. Further, it goes without saying that the excellent characteristics at 100 ° C. to 150 ° C. are excellent even at temperatures exceeding 150 ° C.
【００１９】また、同じく本発明によるボルト締結部等
の加圧部を有するマグネシウム合金製部材は、上記発明
に係わるマグネシウム合金製部材において、さらに、Ｃ
ｕ，Ｚｎのうちの１種または２種を合計で０．２〜２．
５％含有させたものであるから、加圧部での耐へたり
性、とくに高温において加圧部での耐熱へたり性が改善
されると共に、常温での引張り特性がより一層向上した
ボルト締結部等の加圧部を有するマグネシウム合金製部
材となる。A magnesium alloy member having a pressurizing portion such as a bolt fastening portion according to the present invention is the same as the magnesium alloy member according to the above invention, further comprising C
One or two of u and Zn in total of 0.2 to 2.
Since it contains 5%, the bolt resistance is improved in the sag resistance in the pressurization part, especially in the pressurization part at high temperature, and the tensile property at room temperature is further improved. A magnesium alloy member having a pressurizing portion such as a portion.
【００２０】また、合金元素であるＲＥ（希土類元素）
は、高価であるため、ボルト締結部等の加圧部での耐へ
たり性、とくに高温において加圧部での耐熱へたり性を
低下させることなく少しでもその添加量を減らすことが
できるようにすることが望まれており、本発明では、Ｒ
Ｅ含有量を減らしたときでもボルト締結部等の加圧部で
の耐へたり性、とくに高温において加圧部での耐熱へた
り性が優れたものとなり、高価なＲＥの添加量減少によ
って低コスト化ももたらされる。RE (rare earth element) which is an alloy element
Is expensive, so the addition amount can be reduced as much as possible without deteriorating the sag resistance in the pressurizing part such as the bolt fastening part, especially at high temperature. In the present invention, R
Even when the E content is reduced, the sag resistance in the pressurizing part such as the bolt fastening part is excellent, and especially in the pressurizing part at high temperatures, the sag resistance is excellent. It also brings cost.
【００２１】[0021]
【実施例】以下、本発明に係わる加圧部での耐へたり性
の優れたマグネシウム合金製部材の実施例を示す。EXAMPLES Examples of magnesium alloy members having excellent sag resistance in the pressing portion according to the present invention will be shown below.
【００２２】本発明に係わるボルト締結部等の加圧部を
有するマグネシウム合金製部材は、一般的なマグネシウ
ム合金製自動車用部品の溶解，鋳造方法によって製造す
ることができるが、この実施例では、Ｎｉ成分を含まな
いスチール製の坩堝を使用し、ＳＦ６／ＣＯ２／Ａｉｒ
の混合ガスを主成分とする酸化防止用のガスを用いて溶
解，鋳造した。The magnesium alloy member having a pressurizing portion such as a bolt fastening portion according to the present invention can be manufactured by a general melting and casting method of magnesium alloy automobile parts. In this embodiment, Using a steel crucible containing no Ni component, SF 6 / CO 2 / Air
It was melted and cast by using an antioxidative gas whose main component was the mixed gas of.
【００２３】表１ないし表３には、溶製，鋳造して製造
した３８種類（実施例１〜２３，比較例１〜１５）の鋳
造品の合金成分の分析結果を示す。次いで、これらの鋳
物よりマグネシウム合金製引張り試験片および耐熱へた
り性測定用マグネシウム合金製部材を作成し、ＪＩＳ
Ｚ ２２０１とＪＩＳ Ｚ ２２４１に準拠した引張り
試験と図５（Ａ）（Ｂ）に示した要領による耐熱へたり
性試験を行った。Tables 1 to 3 show the results of analysis of alloy components of 38 kinds of cast products (Examples 1 to 23 and Comparative Examples 1 to 15) produced by melting and casting. Then, a magnesium alloy tensile test piece and a magnesium alloy member for measuring the heat settling property were prepared from these castings, and JIS
A tensile test based on Z 2201 and JIS Z 2241 and a heat resistance sag test according to the procedure shown in FIGS. 5A and 5B were performed.
【００２４】この耐熱へたり性試験においては、図５
（Ａ）に示すように、円筒形状をなす耐熱へたり性測定
用マグネシウム合金製部材１と同じく円筒形状をなす異
種部材（スチール製）２とを並べた状態にし、両端にワ
ッシャ３，４を当てて、ボルト５およびナット６で締め
付けた場合と、図５（Ｂ）に示すように、円筒形状をな
す耐熱へたり性測定用マグネシウム合金製部材１１と同
じく円筒形状をなしかつ内周にめねじ１２ａを形成した
異種部材（スチール製）１２とを重ねた状態とし、マグ
ネシウム合金製部材１１にワッシャ１３を当てて、ボル
ト１５をめねじ１２ａにねじ込んで締め付けた場合とに
ついて、ボルト５，１５による締め付け時の軸力低下率
で耐熱へたり性を評価し、この場合、所定軸力３０ＭＰ
ａ，保持時間２００時間，保持温度１００℃と１５０℃
の試験を実施した。なお、この締結部においては、一般
的に用いられている電食防止方法を用いることも出来
る。In this heat resistance sag resistance test, FIG.
As shown in (A), a cylindrical magnesium alloy member 1 for measuring thermal fatigue resistance and a cylindrical heterogeneous member (made of steel) 2 are placed side by side, and washers 3 and 4 are provided at both ends. As shown in FIG. 5 (B), when it is abutted and tightened with the bolt 5 and the nut 6, it has the same cylindrical shape as the cylindrical heat-resistant settling property measuring magnesium alloy member 11 and has an inner circumference. In the case where the dissimilar member (made of steel) 12 having the screw 12a formed thereon is overlapped, the washer 13 is applied to the magnesium alloy member 11, and the bolt 15 is screwed into the female screw 12a and tightened. The thermal fatigue resistance is evaluated based on the rate of decrease in axial force when tightening with the specified axial force of 30MP.
a, holding time 200 hours, holding temperature 100 ℃ and 150 ℃
The test was carried out. In addition, in this fastening part, a commonly used electrolytic corrosion preventing method can be used.
【００２５】このようにして、引張り試験より得られた
引張り強さ，耐力，伸びは、表４ないし表６の「引張り
強さ」，「耐力」，「伸び］の欄に示す結果であった。
また、耐熱へたり性試験により得られた耐熱へたり性評
価（軸力低下率）についても、同じく表４ないし表６に
示す結果であった。The tensile strength, proof stress, and elongation thus obtained by the tensile test were the results shown in the columns of "tensile strength", "proof stress", and "elongation" in Tables 4 to 6. .
Also, the heat sag evaluation (axial force reduction rate) obtained by the heat sag test was also the results shown in Tables 4 to 6.
【００２６】[0026]
【表１】 [Table 1]
【００２７】[0027]
【表２】 [Table 2]
【００２８】[0028]
【表３】 [Table 3]
【００２９】[0029]
【表４】 [Table 4]
【００３０】[0030]
【表５】 [Table 5]
【００３１】[0031]
【表６】 [Table 6]
【００３２】表１ないし表６に示した結果より明らかな
ように、本発明実施例のマグネシウム合金製部材では、
引張り強さ，耐力，伸び等の機械的性質が良好であると
共に、軸力低下率が小さいものとなっており、温度１０
０℃と１５０℃でのボルト締結部の耐熱へたり性に優れ
たものとなっていることが認められた。As is clear from the results shown in Tables 1 to 6, in the magnesium alloy member of the embodiment of the present invention,
Mechanical properties such as tensile strength, proof stress, and elongation are good, and the axial force reduction rate is small.
It was confirmed that the bolt fastening portion at 0 ° C. and 150 ° C. was excellent in heat settling property.
【００３３】これに対して、本発明を満足しない比較例
のマグネシウム合金製部材では、引張り強さ，耐力，伸
びなどの機械的性質に劣ったものがあると共に、軸力低
下率が大きい値を示すものとなっており、温度１００℃
と１５０℃でのボルト締結部の耐熱へたり性に劣るもの
となっていた。On the other hand, the magnesium alloy members of the comparative examples which do not satisfy the present invention have inferior mechanical properties such as tensile strength, proof stress and elongation, and have a large axial force reduction rate. The temperature is 100 ° C.
And, the heat resistance of the bolt fastening part at 150 ° C was inferior.
【００３４】[0034]
【発明の効果】本発明に係わるマグネシウム合金製部材
は、重量％で、Ａｌ：１．５〜１０．０％、ＲＥ：２．
５％以下、Ｃａ：０．２〜５．５％、場合によってはさ
らに、Ｃｕ，Ｚｎのうちの１種または２種：０．２〜
２．５％を含み、残部Ｍｇおよび不純物よりなる成分組
成を有するものであるから、ダイカストのような急冷に
よる凝固形態をとる場合のほか、このような急冷による
凝固形態をとらない場合をも含めて、どのような冷却速
度となる鋳造方法を採用した場合であっても、ボルト締
結部等の加圧部での耐へたり性、とくに高温におけるボ
ルト締結部等の加圧部での耐熱へたり性に優れたものと
することが可能であり、ボルト等の締結手段による良好
な締結状態を長期にわたって維持することが可能になる
という著大なる効果がもたらされる。The magnesium alloy member according to the present invention has a weight percentage of Al: 1.5 to 10.0% and RE: 2.
5% or less, Ca: 0.2 to 5.5%, and in some cases, one or two of Cu and Zn: 0.2 to
Since it has a composition of 2.5% and the balance Mg and impurities, it includes not only the case of solidification by rapid cooling such as die casting but also the case of not taking such solidification by rapid cooling. Therefore, no matter what cooling method is used, the resistance to sag in the pressure parts such as the bolt fastening parts, especially the heat resistance in the pressure parts such as the bolt fastening parts at high temperatures. It is possible to make it easy to loosen, and it is possible to maintain a good fastening state by fastening means such as bolts for a long period of time, which brings about a remarkable effect.
【図１】ＲＥ含有量が０．９〜１．２％であるマグネシ
ウム合金の引張り特性に及ぼすＡｌ含有量の影響を調べ
た結果を示すグラフである。FIG. 1 is a graph showing the results of examining the effect of Al content on the tensile properties of magnesium alloys with RE content of 0.9-1.2%.
【図２】ＲＥ含有量が０％，１．０％，２．０％である
マグネシウム合金の高温（１００℃）でのボルト締結部
における耐熱へたり性（軸力低下率）に及ぼすＡｌ含有
量の影響を調べた結果を示すグラフである。FIG. 2 is an Al content that affects the thermal fatigue resistance (axial force reduction rate) of a bolted portion of a magnesium alloy having RE contents of 0%, 1.0% and 2.0% at high temperature (100 ° C.). It is a graph which shows the result of having investigated the influence of quantity.
【図３】ＲＥ含有量が０．９〜１．２％であるマグネシ
ウム合金の引張り特性に及ぼすＣａ含有量の影響を調べ
た結果を示すグラフである。FIG. 3 is a graph showing the results of examining the effect of Ca content on the tensile properties of magnesium alloys with RE content of 0.9-1.2%.
【図４】ＲＥ含有量が１．０％，２．０％であるマグネ
シウム合金の高温（１００℃）でのボルト締結部におけ
る耐熱へたり性（軸力低下率）に及ぼすＣａ含有量の影
響を調べた結果を示すグラフである。FIG. 4 Effect of Ca content on heat-resistant settling property (axial force reduction rate) of a bolted portion of a magnesium alloy having RE contents of 1.0% and 2.0% at high temperature (100 ° C.) It is a graph which shows the result of having investigated.
【図５】本発明の実施例で採用したボルト締結部の構造
を示す断面説明図である。FIG. 5 is an explanatory cross-sectional view showing the structure of a bolt fastening portion adopted in the embodiment of the present invention.
フロントページの続き (72)発明者 金 光 亨 輔 山口県宇部市西本町１丁目12番32号 宇部 興産株式会社宇部本社内 (72)発明者 渡 辺 浩 児 神奈川県横浜市神奈川区宝町２番地 日産 自動車株式会社内 (72)発明者 松 長 正 治 神奈川県横浜市神奈川区宝町２番地 日産 自動車株式会社内 (72)発明者 鞘 師 守 神奈川県横浜市神奈川区宝町２番地 日産 自動車株式会社内Front page continuation (72) Inventor Torusuke Kanemitsu 12-12-32 Nishimotomachi, Ube City, Ube Yamaguchi Prefecture Ube Head Office Ube Headquarters (72) Inventor Hiroko Watanabe 2 Takaracho, Kanagawa-ku, Yokohama, Kanagawa Prefecture Nissan Motor Co., Ltd. (72) Inventor Masaharu Matsunaga 2 Takara-cho, Kanagawa-ku, Yokohama, Kanagawa Nissan Motor Co., Ltd. (72) Inventor Mamoru Mamoru 2 Takara-cho, Kanagawa-ku, Yokohama, Kanagawa Nissan Motor Co., Ltd.
Claims (7)
ＲＥ：２．５％以下、Ｃａ：０．２〜５．５％を含み、
残部Ｍｇおよび不純物よりなることを特徴とする加圧部
での耐へたり性に優れたマグネシウム合金製部材。1. Al: 1.5 to 10.0% by weight,
RE: 2.5% or less, including Ca: 0.2 to 5.5%,
A magnesium alloy member excellent in sag resistance in a pressurizing part, characterized by comprising the balance Mg and impurities.
１に記載の加圧部での耐へたり性に優れたマグネシウム
合金製部材。2. A magnesium alloy member excellent in settling resistance in a pressurizing part according to claim 1, wherein Ca: 0.25 to 5.5%.
〜２．０％、Ｃａ：０．５〜４．０％である請求項１に
記載の加圧部での耐へたり性に優れたマグネシウム合金
製部材。3. Al: 2.0 to 8.0%, RE: 0.5
The magnesium alloy member having excellent sag resistance in the pressurizing part according to claim 1, wherein the magnesium content is ˜2.0% and Ca: 0.5-4.0%.
ＲＥ：２．５％以下、Ｃａ：０．２〜５．５％、および
Ｃｕ，Ｚｎのうちの１種または２種：０．２〜２．５％
を含み、残部Ｍｇおよび不純物よりなることを特徴とす
る引張り特性および加圧部での耐へたり性に優れたマグ
ネシウム合金製部材。4. Al: 1.5 to 10.0% by weight,
RE: 2.5% or less, Ca: 0.2 to 5.5%, and one or two of Cu and Zn: 0.2 to 2.5%
A magnesium alloy member having excellent tensile properties and settling resistance in a pressurizing part, characterized in that it comprises the balance Mg and impurities.
〜２．０％、Ｃａ：０．２〜４．０％である請求項４に
記載の引張り特性および加圧部での耐へたり性に優れた
マグネシウム合金製部材。5. Al: 2.0 to 8.0%, RE: 0.5
~ 2.0%, Ca: 0.2-4.0%, the magnesium alloy member having excellent tensile properties and sag resistance in a pressed part according to claim 4.
へたり性である請求項１ないし５のいずれかに記載の加
圧部での耐へたり性に優れたマグネシウム合金製部材。6. The magnesium alloy having excellent sag resistance in a pressurizing part according to claim 1, wherein the sag resistance in the pressurizing part is heat resisting sag in a high temperature. Made parts.
ないし６のいずれかに記載の加圧部での耐へたり性に優
れたマグネシウム合金製部材。7. The pressurizing portion is a bolt fastening portion.
7. A magnesium alloy member having excellent sag resistance in the pressure part according to any one of items 1 to 6.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP6073348A JPH07278717A (en) | 1994-04-12 | 1994-04-12 | Magnesium alloy member excellent in settling resistance in pressurized part |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP6073348A JPH07278717A (en) | 1994-04-12 | 1994-04-12 | Magnesium alloy member excellent in settling resistance in pressurized part |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH07278717A true JPH07278717A (en) | 1995-10-24 |
Family
ID=13515573
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP6073348A Pending JPH07278717A (en) | 1994-04-12 | 1994-04-12 | Magnesium alloy member excellent in settling resistance in pressurized part |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH07278717A (en) |
Cited By (13)
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|---|---|---|---|---|
| JPH07331375A (en) * | 1994-06-06 | 1995-12-19 | Toyota Motor Corp | Heat resistant magnesium alloy for casting |
| EP0791662A1 (en) * | 1996-02-27 | 1997-08-27 | Honda Giken Kogyo Kabushiki Kaisha | Heat-resistant magnesium alloy |
| EP0799901A1 (en) * | 1996-04-04 | 1997-10-08 | Mazda Motor Corporation | Heat-resistant magnesium alloy member |
| EP1044742A2 (en) * | 1999-03-29 | 2000-10-18 | Kurimoto Limited | Threaded fastener and a method of making the same |
| WO2000063452A1 (en) * | 1999-04-03 | 2000-10-26 | Volkswagen Aktiengesellschaft | Highly ductile magnesium alloys, method for producing them and use of the same |
| WO2000060131A3 (en) * | 1999-04-03 | 2001-01-11 | Volkswagen Ag | Highly ductile magnesium alloys, method of preparing same and their use |
| US6342180B1 (en) | 2000-06-05 | 2002-01-29 | Noranda, Inc. | Magnesium-based casting alloys having improved elevated temperature properties |
| WO2004113742A1 (en) * | 2003-06-19 | 2004-12-29 | Sumitomo (Sei) Steel Wire Corp. | Magnesium-base alloy screw and method of manufacturing the same |
| WO2005028691A1 (en) * | 2003-09-18 | 2005-03-31 | Toyota Jidosha Kabushiki Kaisha | Heat resistant magnesium die casting alloys |
| JP2011141032A (en) * | 2003-06-19 | 2011-07-21 | Sumitomo Electric Ind Ltd | Magnesium-base alloy screw |
| CN103966494A (en) * | 2014-04-16 | 2014-08-06 | 太原华银泰合金有限公司 | Highly heat-resistant magnalium containing calcium and rare earth |
| WO2020082780A1 (en) * | 2018-10-23 | 2020-04-30 | 重庆大学 | Copper-containing, high-toughness and rapidly degradable magnesium alloy, preparation method therefor and use thereof |
| WO2020183980A1 (en) | 2019-03-12 | 2020-09-17 | 本田技研工業株式会社 | Flame-retardant magnesium alloy and method for producing same |
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| WO2005028691A1 (en) * | 2003-09-18 | 2005-03-31 | Toyota Jidosha Kabushiki Kaisha | Heat resistant magnesium die casting alloys |
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| CN103966494A (en) * | 2014-04-16 | 2014-08-06 | 太原华银泰合金有限公司 | Highly heat-resistant magnalium containing calcium and rare earth |
| WO2020082780A1 (en) * | 2018-10-23 | 2020-04-30 | 重庆大学 | Copper-containing, high-toughness and rapidly degradable magnesium alloy, preparation method therefor and use thereof |
| US11299797B2 (en) | 2018-10-23 | 2022-04-12 | Chongqing University | Copper-containing, high-toughness and rapidly degradable magnesium alloy, preparation method therefor and use thereof |
| WO2020183980A1 (en) | 2019-03-12 | 2020-09-17 | 本田技研工業株式会社 | Flame-retardant magnesium alloy and method for producing same |
| EP3940101A4 (en) * | 2019-03-12 | 2022-11-23 | Honda Motor Co., Ltd. | Flame-retardant magnesium alloy and method for producing same |
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