WO2006046320A1 - マグネシウム合金製筐体 - Google Patents
マグネシウム合金製筐体 Download PDFInfo
- Publication number
- WO2006046320A1 WO2006046320A1 PCT/JP2005/001363 JP2005001363W WO2006046320A1 WO 2006046320 A1 WO2006046320 A1 WO 2006046320A1 JP 2005001363 W JP2005001363 W JP 2005001363W WO 2006046320 A1 WO2006046320 A1 WO 2006046320A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- magnesium alloy
- superplastic
- superplastic forming
- forming
- magnesium
- Prior art date
Links
Classifications
-
- 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
-
- 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
Definitions
- the present invention relates to a magnesium alloy casing having a superplastic compact strength of a magnesium alloy plate material, and more specifically, the oxygen concentration and material composition of the magnesium alloy plate material are controlled with high accuracy.
- the present invention relates to a magnesium alloy casing made of a superplastic molded body having a high quality and a complicated shape, which suppresses the formation of cavities in superplastic molding, and a manufacturing technique thereof.
- the present invention provides, for example, a novel magnesium alloy casing that has high fracture resistance and high strength characteristics that can be used in a wide range of fields, such as space aviation materials, electronic equipment materials, and automobile parts. Is.
- many magnesium products in Japan are made by forging methods such as die casting and thixocasting. The fact that thin molding is possible by these methods is the biggest factor that promoted the industrial use of magnesium alloy materials.
- magnesium alloy forging materials are used in housings for home appliances such as a personal computer, a mobile phone, and a digital camera.
- the current method of producing magnesium alloy materials by forging requires problems such as post-processing to compensate for forging defects, low yields, and problems in strength / rigidity of components. Exists.
- the plastic working process can be said to be an effective means of expanding demand because, generally, high yield and high toughness can be achieved simultaneously with molding with a high yield.
- a molded body can be produced from a magnesium alloy plate material by deep drawing, stretch molding, blow molding, etc.
- a thin and high-strength molded body can be produced by an inexpensive process, and a housing for home appliances can be produced.
- Many demands for the body can be expected.
- the fact is that there have been few examples of magnesium alloy members produced by the plastic cache process.
- the critical decomposition shear stress of non-bottom slip of a magnesium alloy is very large at room temperature as compared with other slip systems, and the room temperature formability is low.
- the magnesium alloy rolled material has a feature that a ⁇ 0001 ⁇ plane is formed in parallel with the plate surface, and a distortion in the plate thickness direction during plastic deformation cannot be expected. It is a factor that prevents it. Due to the above problems, the fact that it is essentially difficult to carry out cold press forming is a major reason why magnesium alloy members cannot be produced by the plastic cache process.
- superplastic deformation refers to “a phenomenon in which tensile stress of a polycrystalline material exhibits high strain rate dependence with high deformation stress and exhibits a huge elongation of several hundred% or more without causing local shrinkage”.
- the shape of the crystal itself basically does not change, and the deformation is achieved by the crystals sliding between the interfaces. This phenomenon is called grain boundary sliding.
- superplastic deformation occurs when the crystal grain size of the material is reduced and the sample is heated to a temperature of about 50% or more of the liquidus temperature.
- Examples of a method for forming a magnesium alloy sheet using superplastic forming include, for example, (1) a magnesium alloy part and its manufacturing method (Patent Document 1), (2) a magnesium part and its manufacturing method (Patent Document) 2), (3) Magnesium material spindle processing method and apparatus (Patent Document 3), (4) Magnesium alloy plate material deep drawing method and molded body (Patent Document 4), and the like.
- the main focus is on producing a complicated structural member by superplastic forming by performing boss standing on a plate material, spindle processing, deep drawing forming, etc. by superplastic forming.
- Patent Document 1 Japanese Unexamined Patent Application Publication No. 2004-149841
- Patent Document 2 Japanese Patent Laid-Open No. 2003-311360
- Patent Document 3 Japanese Patent Laid-Open No. 2000-126827
- Patent Document 4 Japanese Patent Application Laid-Open No. 2004-58111
- FIG. 1 shows the principle of grain boundary sliding.
- Grain boundary sliding refers to a mechanism in which deformation is achieved by movement of crystals between grain boundaries without accompanying intra-grain deformation. When ideal grain boundary slip occurs between crystals, the crystals move between the grain boundaries without any intra-granular deformation, and inevitably cavities are created near the grain boundary triple point.
- Figure 2 shows the temperature dependence of the grain boundary diffusion coefficient of various alloys (M. Mabuchi et al .: Tensile Properties at Room Temperature to 823K of Mg-4Y-3RE Alloy ", Mater. Trans. 43 (2002 ), pp.2063- 2068) The horizontal axis of Fig.
- the cavities seen in Fig. 3 occur when the formation of cavities near grain boundaries cannot be mitigated by the diffusion of materials. In other words, control of the deformation temperature that affects the diffusion rate and the strain rate that affects the cavity formation rate are very important factors in superplastic forming.
- the present invention has been made in view of the above problems, and specifies the composition of the magnesium alloy plate material so that the amount of internal impurities is not more than an appropriate value. As a result, it has been completed based on the new knowledge of the present inventors that it is feasible to produce and provide a magnesium alloy casing having a complicated shape while guaranteeing formability as a superplastic molded body. It has been done.
- An object of the present invention is to provide a magnesium alloy casing having a high quality and a complicated shape, which guarantees formability as a superplastic molded body.
- the present invention provides a superplastic compact of a magnesium alloy plate material in which aluminum is added as 1.0 to 10. Omass% and zinc as 0. 5-3. Consists of a superplastic formed body of magnesium alloy sheet containing Omass%, 0.1-0. 8 mass% manganese, and oxygen concentration of 300 massppm or less, and has a structure that suppresses the formation of cavities in superplastic forming.
- a magnesium alloy casing characterized by comprising: This magnesium alloy casing has (1) superplastic forming strength of magnesium alloy sheet with oxygen concentration of lOOmassppm or less, and (2) some parts of magnesium alloy sheet are formed by superplastic forming.
- the present invention is a lightweight structural member characterized by the above-mentioned magnesium alloy casing force.
- Magnesium is an element having the highest affinity for oxygen among practical metals, and is used as a deoxidizer in steel refinery and the like.
- a cover gas such as a mixed gas of SF and CO so that molten magnesium does not come into contact with the atmosphere.
- FIG. 4 shows the mechanism of cavity formation. Stress concentration occurs near the oxide during superplastic forming, and dislocations accumulate around the oxide, resulting in void formation starting from the oxide.
- the cavity formation shown in Fig. 4 occurs frequently inside the material, the cavities coalesce and become the starting point of destruction.
- the present inventors have controlled superplastic deformation while suppressing the formation of cavities by controlling the oxygen concentration of the material to an appropriate value and further adding an appropriate additive element to magnesium. It was possible to achieve this, and we obtained new knowledge that it was possible to create a case made of a high-quality, complex-shaped magnesium alloy plate.
- the oxide serves as a barrier for grain boundary diffusion, impedes relaxation of cavity formation, and remarkably deteriorates formability. For this reason, the inclusion of oxides in the magnesium alloy sheet should be avoided as much as possible. That is, the present inventors have confirmed that the phenomenon in which the oxide promotes the formation of cavities can be suppressed by suppressing the oxygen concentration to 300 ppm or less, preferably to 10 ppm. If the oxygen concentration of the magnesium alloy plate exceeds 300 ppm, the formation of the cavity and the expansion of the cavity cannot be suppressed.
- the superplastic compact is produced by using a magnesium alloy plate material that has been controlled with high accuracy within a predetermined range so that the oxygen concentration does not exceed 300 ma SS ppm. is important.
- the present invention if it has fine crystal grains having a magnesium alloy strength of 20 ⁇ m or less, preferably, if it has fine crystal grains of 15 ⁇ m or less, it is 473K or more and 723K or less. Temperature range At 1 X 10- 5 lZs least 1 X 10 _1 lZs less strain rate region, can be readily expressed superplastic phenomena.
- the definition of superplastic deformation is that the strain of a part of the magnesium alloy plate is 1.0 or more, or that part of the plate is deformed by grain boundary sliding.
- the crystal grains of the plate material do not grow during molding, or the crystal grains become finer due to dynamic recrystallization. That is, according to the present invention, it can be proved that the crystal grains at the most deformed portion of the molded body are 20 ⁇ m or less, preferably 15 m, as evidence of superplastic forming.
- the crystal grain size of the magnesium alloy plate material to be used for superplastic forming should be finer than 20 ⁇ m.
- a magnesium alloy plate having a relatively coarse particle size of about 40 m can be used for superplastic forming.
- a magnesium alloy plate material with a coarse particle size of about m is used for superplastic forming, it is possible to refine the crystal grains of the plate material by using dynamic recrystallization during processing and to achieve effective superplasticity. Molding can be applied to the magnesium alloy plate.
- the amount of aluminum added is preferably 1. Omass% or more and 10 mass% or less.
- addition of zinc is necessary to maintain the strength of the recycled material.
- the addition of zinc with Omass% or more is not preferable because it may deteriorate the corrosion characteristics.
- Manganese can mitigate the effects of iron, an impurity element that reduces corrosion resistance. By adding manganese within the above range, the effect can be exhibited most.
- the addition of manganese is indispensable for controlling the crystal grain size of the magnesium alloy plate material. If an appropriate amount of manganese is not added, crystal grains inside the material grow during superplastic forming, and it becomes difficult to maintain fine crystals that can cause grain boundary sliding. Specifically, it is desirable to add manganese at least 0.1 lmass%. On the other hand, when manganese is added in an amount of 0.8 mass% or more, coarse manganese 'aluminum intermetallic compounds are formed inside the material, which adversely affects the ductility' strength of the material. Manganese addition! ] Is preferred.
- the magnesium alloy casing obtained by superplastic forming the magnesium alloy plate material of the present invention does not depend on the type of superplastic forming.
- Examples of forming a magnesium alloy plate by superplastic forming include deep drawing, stretch forming, and blow forming.
- the present invention guarantees formability as a superplastic molded body by controlling the material of the magnesium alloy plate material with high accuracy, and produces a casing having a high quality and a complicated shape.
- the present invention can be applied to a case made of a magnesium alloy produced by any method.
- the magnesium alloy casing of the present invention is manufactured through superplastic forming, a specific amount of anorium, zinc, and manganese may be added to the magnesium alloy sheet as part of the additive elements. For example, fine crystals can be retained by superplastic forming. Specifically, a magnesium alloy casing that has superplastic forming strength with a part of crystal grains of 20 ⁇ m or less by high-precision control of the addition amount and oxygen concentration of these additive elements. A body can be produced. The yield strength (hardness) of magnesium alloys has a strong correlation with the crystal grain size, and it is possible to produce a high-strength housing by refining the crystal grains to 20 m or less.
- a magnesium alloy casing having a complicated shape can be produced by superplastic forming by controlling the oxygen concentration and material composition of the magnesium alloy sheet.
- AZ31 magnesium alloy rolled materials having various oxygen concentrations were prepared, and their superplastic formability was evaluated.
- the composition of AZ31 magnesium alloy is Mg-3mass% Al-lmass% Zn-0.5mass% Mn, which is a typical magnesium alloy for extension.
- An AZ31 magnesium alloy sheet with a width of 50 mm and a thickness of 5 mm with different internal oxygen concentrations was prepared.
- the magnesium alloy sheet was subjected to hot rolling at a sample temperature of 673K to produce a rolled magnesium alloy sheet having a thickness of 1 mm. In hot rolling, roll heating was not performed, and the rolling reduction per pass was 12%.
- Table 1 summarizes the oxygen concentration of the specimen and the average crystal grain size of the sample.
- the oxygen concentration was measured by a glow discharge mass spectrometer (GDMS), and the crystal grain size was measured by observing the structure of a plane parallel to the rolling direction with an optical microscope and by a section method.
- GDMS glow discharge mass spectrometer
- a rectangular magnesium alloy sheet having a length of 70 mm, a width of 70 mm, and a thickness of 1 mm was cut out from the rolled material and subjected to superplastic blow molding.
- blow molding the press die and molding die shown in Fig. 5 were used.
- a magnesium alloy sheet is fixed between both molds, and the mold and test piece are heated to 673K.
- Blow molding was performed by applying a pressure of 0.2 MPa or 0.5 MPa to the material.
- the strain rate of the material during the strain rate of the material at the time of applying a pressure of 0. 2 MPa is obtained by applying a pressure of about 1 X 10- 5 s- 0. 5MPa to about 1 X 10- 4 s- 1 Equivalent to. Molding was completed when a part of the plate broke.
- Table 2 summarizes the results of subjecting various AZ31 magnesium alloy sheet materials to blow molding.
- Figure 6 shows the typical outline of the plate after blow molding. Focusing on the outer shapes of Example 1 and Example 7 in FIG. 6, it can be confirmed that in Example 1, a complete cup shape can be formed. On the other hand, in Example 7, the cup shape could not be molded, but the dome shape could be molded.
- Examples 1 and 7 are the results of the plate material with the lowest internal oxygen concentration (14 mass ssppm). According to various examples, the formability tended to decrease as the oxygen concentration increased.
- the symbols shown in the column of “formability” in Table 2 are the results of visual comparison between the results of Example 1 or Example 7 and the results of this example.
- O indicates a condition in which a visual difference can hardly be confirmed.
- ⁇ indicates a condition where a part of the deterioration of formability was visually observed.
- X represents a condition where deterioration of formability was clearly confirmed after multiple moldings under the same conditions.
- Example 3 and Example 11 the parts marked with ⁇ are molded The deterioration of the property was almost unnoticeable visually.
- Example 7 and Example 15 when the oxygen concentration was higher than 300 mas S ppm, it was confirmed that the moldability was clearly degraded.
- Table 2 also shows the crystal grain size of the sample after blow molding.
- the measurement location is the central part of the plate, which is the most deformed part of the plate.
- V and misaligned crystal grains were also kept fine (less than 20 m), suggesting that the sample was deformed by superplastic forming.
- FIG. 7 shows the result of observing the cross section of the sample subjected to blow molding in Example 3 and Example 11 and measuring the plate thickness distortion of each part.
- the X-axis shows the strain measurement location, and the central part of the plate is defined as Omm, showing the thickness strain distribution on a concentric circle.
- the Y axis shows the thickness strain distribution at each measurement point.
- a plate thickness strain of 1.0 or more was confirmed at some measurement points, indicating that superplastic forming was achieved. In other words, it was confirmed that superplastic forming was manifested in the sample in which the oxygen concentration was controlled with high accuracy.
- the present invention relates to a magnesium alloy casing, and according to the present invention, the impurities and composition of the magnesium alloy plate material are precisely defined, so that the superplastic forming is performed.
- a magnesium alloy casing having a complicated shape which has a structure in which the formation of cavities is suppressed, imparts high fracture resistance and high strength characteristics.
- the present invention enables the practical application and mass production of an ultralight magnesium alloy casing that can be actively applied to the casing of home appliances such as digital cameras, notebook computers, and PDAs. Useful as.
- FIG. 1 A diagram showing the principle of grain boundary sliding. It shows that the material is deformed by moving the crystal between grain boundaries without deforming the crystal grains.
- FIG. 2 is a graph showing the temperature dependence of grain boundary diffusion coefficients of magnesium, iron, and aluminum.
- the grain boundary diffusion coefficient of magnesium is significantly higher than that of aluminum and iron over the entire temperature range.
- the horizontal axis represents the dimensionless temperature specified by the melting point, and the vertical axis represents the dimensionless grain boundary diffusion coefficient.
- FIG. 6 is a diagram showing a state of an internal cavity generated when deformation is applied. It shows the formation of fine cavities smaller than 1 ⁇ m and relatively coarse cavities larger than 5 ⁇ m. The initial crystal grain size is 10 m.
- FIG. 4 A diagram showing the principle of cavity formation during superplastic forming when impurities exist inside the material. It is shown that stress concentration occurs near the oxide during superplastic forming, and further, dislocations accumulate around the oxide, resulting in the formation of cavities starting from the oxide. Yes.
- FIG. 5 is a view showing the shape of a mold used for blow molding in an example.
- FIG. 6 is a view of the appearance of a magnesium alloy sheet after blow molding, observed from the side. The results are shown when the applied gas pressure is 0.5 MPa and 0.2 MPa. This shows that the formability of the plate deteriorates as the internal oxygen concentration of the magnesium alloy plate increases.
- FIG. 7 is a view showing a plate thickness strain distribution of samples subjected to blow molding in Example 3 and Example 11. This indicates that a thickness distortion of 1.0 or more has developed in some parts of the sample.
- the X-axis shows the measurement point of strain.
- the center part of the plate is defined as Omm, and the thickness strain distribution on the concentric circle is shown! /.
- the Y axis shows the thickness strain distribution at each measurement point.
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Mechanical Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Shaping Metal By Deep-Drawing, Or The Like (AREA)
- Laminated Bodies (AREA)
- Casings For Electric Apparatus (AREA)
Abstract
Description
Claims
Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US11/718,285 US20090060776A1 (en) | 2004-10-29 | 2005-01-31 | Case made of magnesium alloy |
EP05709520A EP1826284A4 (en) | 2004-10-29 | 2005-01-31 | MAGNESIUM ALLOY HOUSING |
CN2005800375868A CN101103131B (zh) | 2004-10-29 | 2005-01-31 | 镁合金制筐体 |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2004-316330 | 2004-10-29 | ||
JP2004316330A JP2006124795A (ja) | 2004-10-29 | 2004-10-29 | マグネシウム合金製筐体 |
Publications (1)
Publication Number | Publication Date |
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WO2006046320A1 true WO2006046320A1 (ja) | 2006-05-04 |
Family
ID=36227571
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
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PCT/JP2005/001363 WO2006046320A1 (ja) | 2004-10-29 | 2005-01-31 | マグネシウム合金製筐体 |
Country Status (6)
Country | Link |
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US (1) | US20090060776A1 (ja) |
JP (1) | JP2006124795A (ja) |
KR (1) | KR20070122443A (ja) |
CN (1) | CN101103131B (ja) |
TW (1) | TW200615384A (ja) |
WO (1) | WO2006046320A1 (ja) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
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CN114669651A (zh) * | 2022-04-13 | 2022-06-28 | 中国航空制造技术研究院 | 镁铝金属复合结构的制造方法 |
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CN115029594A (zh) * | 2022-06-20 | 2022-09-09 | 重庆大学 | 一种变形镁合金及其制备方法 |
Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2003239033A (ja) * | 2001-12-14 | 2003-08-27 | Matsushita Electric Ind Co Ltd | マグネシウム合金素形材とその鋳造方法 |
Family Cites Families (3)
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CN1132951C (zh) * | 2001-12-11 | 2003-12-31 | 戴建林 | 触变注射成形用镁合金粒的熔炼及加工方法 |
CN1296502C (zh) * | 2001-12-14 | 2007-01-24 | 松下电器产业株式会社 | 镁合金型材毛坯、其连续铸造方法及连续铸造装置 |
JP3771203B2 (ja) * | 2002-07-30 | 2006-04-26 | 独立行政法人産業技術総合研究所 | マグネシウム合金製板材の深絞り成形方法およびその成形体 |
-
2004
- 2004-10-29 JP JP2004316330A patent/JP2006124795A/ja active Pending
-
2005
- 2005-01-31 CN CN2005800375868A patent/CN101103131B/zh active Active
- 2005-01-31 KR KR1020077012047A patent/KR20070122443A/ko not_active Application Discontinuation
- 2005-01-31 WO PCT/JP2005/001363 patent/WO2006046320A1/ja active Application Filing
- 2005-01-31 US US11/718,285 patent/US20090060776A1/en not_active Abandoned
- 2005-09-12 TW TW094131326A patent/TW200615384A/zh unknown
Patent Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2003239033A (ja) * | 2001-12-14 | 2003-08-27 | Matsushita Electric Ind Co Ltd | マグネシウム合金素形材とその鋳造方法 |
Non-Patent Citations (2)
Title |
---|
FUJII H.: "Magnesium Seizo Gijutsu to Press Kako Gijutsu", ALUTOPIA, vol. 32, no. 2, 2002, pages 16 - 20, XP002999306 * |
SENNO Y. ET AL: "Magnesium Gokin In-house Scrap-zai no Kotai Recycle", MATERIA JAPAN, vol. 43, no. 4, 20 April 2004 (2004-04-20), pages 270 - 274, XP002999305 * |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN114669651A (zh) * | 2022-04-13 | 2022-06-28 | 中国航空制造技术研究院 | 镁铝金属复合结构的制造方法 |
Also Published As
Publication number | Publication date |
---|---|
KR20070122443A (ko) | 2007-12-31 |
CN101103131A (zh) | 2008-01-09 |
US20090060776A1 (en) | 2009-03-05 |
CN101103131B (zh) | 2010-04-21 |
TWI367951B (ja) | 2012-07-11 |
JP2006124795A (ja) | 2006-05-18 |
TW200615384A (en) | 2006-05-16 |
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