WO2013069638A1 - 高強度Mg合金およびその製造方法 - Google Patents
高強度Mg合金およびその製造方法 Download PDFInfo
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- WO2013069638A1 WO2013069638A1 PCT/JP2012/078734 JP2012078734W WO2013069638A1 WO 2013069638 A1 WO2013069638 A1 WO 2013069638A1 JP 2012078734 W JP2012078734 W JP 2012078734W WO 2013069638 A1 WO2013069638 A1 WO 2013069638A1
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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
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C1/00—Making non-ferrous alloys
- C22C1/02—Making non-ferrous alloys by melting
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- 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
- C22C23/04—Alloys based on magnesium with zinc or cadmium 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
Definitions
- the present invention relates to a high-strength Mg alloy and a method for producing the same.
- Mg alloy is attracting attention as a structural material because of its light weight and high specific strength.
- Patent Document 1 contains Zn and a rare earth element (RE: Gd, Tb, one or more of Tm), the balance being Mg and inevitable impurities, and a long-period stacked structure (LPSO: Long Stacking Ordered Structure).
- RE rare earth element
- LPSO Long Stacking Ordered Structure
- the above proposed alloy has a problem that it is expensive as a structural material because the rare earth element RE is an essential element.
- An object of the present invention is to provide an Mg alloy capable of exhibiting high strength without using an expensive rare earth element RE and a method for producing the same.
- Ca and Zn are contained within the solid solution limit, and the balance has a chemical composition consisting of Mg and inevitable impurities, It consists of equiaxed crystal grains, and there are segregated regions of Ca and Zn along the c-axis direction of the Mg hexagonal lattice in the crystal grains, and the segregated regions are arranged at intervals of Mg3 atoms in the a-axis direction of the Mg hexagonal lattice.
- a high-strength Mg alloy characterized by having a structure is provided.
- a method for producing the high-strength Mg alloy wherein Ca and Zn are added to Mg in a blending amount corresponding to the composition, and the ingot formed by melting and casting is homogenized heat treatment.
- a method for producing a high-strength Mg alloy is provided, which is characterized by forming the above structure by hot working.
- the segregation regions are Mg 3 in the a-axis direction of the Mg hexagonal lattice.
- the alloy of the present invention contains Ca and Zn within the solid solution limit, and the balance has a chemical composition consisting of Mg and inevitable impurities. Thereby, a state in which Ca and Zn are dissolved in Mg is obtained. Since it is in a solid solution state, an intermetallic compound (ordered phase) and coarse precipitates are not generated, and ductility is not reduced thereby.
- the solid solution limit is unknown for the Mg—Ca—Zn ternary system, but in the Mg—Ca binary phase diagram (Mg solid solution region limit at 515 ° C.), the solid solution limit of Ca in Mg is 0. In the Mg—Zn binary phase diagram (Mg solid solution region limit at 343 ° C.), the solid solution limit of Zn in Mg is 3.5 at%. Taking this known fact as a guideline, in the alloy of the present invention, the content can be set to Ca: 0.5 at% or less and Zn: 3.5 at% or less in order to ensure a solid solution state.
- a feature of the alloy of the present invention is that it consists of equiaxed grains, and there is a segregation region of Ca and Zn along the c-axis direction of the Mg hexagonal lattice in the crystal grains, and the segregation region is the a-axis direction of the Mg hexagonal lattice.
- the formation of fine equiaxed crystal grains suppresses the generation of deformation twins, so that the deformation behavior in compression, particularly the yield stress, increases, and the good formability necessary for the structural material can be ensured.
- the crystal grain size is desirably less than 1 ⁇ m, that is, several hundred nm or less.
- the alloy of the present invention is characterized by an electron microscope level structure. That is, there is a segregation region of Ca and Zn along the c-axis [0001] direction of the Mg hexagonal lattice in the crystal grains, and this segregation region is the a-axis [11-20 of the Mg hexagonal lattice as described in detail in Examples.
- the periodic structure is formed in the direction of Mg3 atoms.
- a linear segregation region D is schematically shown in FIG. Since the Mg lattice is distorted by the presence of the linear segregation region D along the c-axis direction, the segregation region acts as a barrier against the movement of dislocations on the bottom surface (0001), and high strength is achieved.
- it is necessary to perform hot working after casting and solution treatment (homogenization). Thereby, high strength can be realized without using an expensive rare earth element RE.
- the Mg alloy of the present invention was produced according to the following procedures and conditions.
- Each component was blended corresponding to the composition of Table 1 and melted in a mixed atmosphere of carbon dioxide and flame retardant gas.
- FIG. 2 plots the 0.2% specific strength against the breaking elongation on the horizontal axis for all the samples 1 to 14 in Table 1.
- the present invention is characterized in that the strength is improved in the same ductility.
- Sample Nos. 1 to 6 have the highest specific strength with respect to the breaking elongation on the horizontal axis in FIG. The ⁇ (circle) plots of these sample numbers are in the dotted area shown at the top in the figure.
- the periodic structure of the present invention was obtained, and an excellent combination of ductility and strength was obtained as described above.
- Sample No. 7 has the Ca, Zn content and content ratio, and the first extrusion temperature within the desirable range of the present invention, as in Sample Nos. 1 to 6 above. However, as shown by the ⁇ (square) plot in FIG. 2, the Ca content is 0.15 at% which is lower than 0.3 at% of the sample numbers 1 to 6, so that the sample numbers 1 to 6 are obtained. Lower than specific strength. A periodic structure is obtained in the crystal structure. As described above, since the strength varies depending on the contents of the alloy elements Ca and Zn, it is necessary to strictly compare the combination of ductility and strength at the same alloy element content. Except for the sample number 7, all have the same Ca content of 0.3 at%.
- Sample Nos. 8 to 11 have a content ratio Ca: Zn outside the desirable range of 1: 2 to 1: 3 of the present invention. As indicated by a ⁇ (triangle) plot in FIG. 2, these samples are located in a region of lower intensity than the region of the ⁇ plots of sample numbers 1 to 6. There is no periodic structure in the crystal structure.
- Sample numbers 12 to 14 were different from other samples in that hot working by extrusion was performed only once at a temperature of less than 300 ° C. These samples are in the lowest position, as shown by the x (cross) plot in FIG.
- the Ca: Zn ratio is out of range (sample numbers 12, 14)
- the hot working (extrusion) temperature is less than 300 ° C. (sample numbers 12, 13, 14)
- crystals There is no periodic structure in the tissue (sample numbers 12, 13, 14).
- Table 1 shows the average crystal grain size and the presence / absence of a periodic structure measured by observation of the structure with a transmission electron microscope (TEM).
- Sample name 0309CZ-1 composition: Mg-0.3 at% Ca-0.9 at% Zn, second extrusion temperature: 238 ° C.
- sample name 0306CZ-1 composition: Mg-0.3 at% Ca-0.6 at % Zn, second extrusion temperature: 236 ° C.
- FIG. 3 shows (a) a Fourier transform pattern of a lattice image (corresponding to an electron diffraction image) and (b) a lattice image, as a typical example of electron microscope observation, for sample name 0309CZ-1.
- sample name 0309CZ-1 and sample name 0306CZ-1 among the samples manufactured in this example satisfy the provisions of the present invention.
- the average crystal grain size of these two samples was 300 nm, and they were equiaxed crystal grains.
- the mechanical properties of sample name 0309CZ-1 were 18% elongation at break with a specific strength of 375 kNm / kg, and sample name 0306CZ-1 was 6% elongation at break with a specific strength of 482 kNm / kg. .
- the formation of the periodic structure depends on the second extrusion temperature for each composition.
- the presence or absence of the periodic structure is determined by a combination with other hot working conditions such as the first extrusion condition.
- hot working conditions suitable for the generation of the periodic structure can be set by preliminary experiments. This preliminary experiment can be easily performed by a person skilled in the art by a well-known technique.
- the periodic structure by the above superlattice is the most important feature of the alloy of the present invention. That is, as shown in FIG. 1, the segregation region D of Ca and Zn extends linearly in the c-axis direction.
- FIG. 4A shows the periodic structure of the present invention observed from the a-axis [-1-120] direction shown in FIG. 4B.
- the segregation region D of Ca and Zn exists every three atomic planes in the a-axis [1-100] direction. This corresponds to the fact that there are two diffraction spots between the diffraction spot of the ⁇ 01-10 ⁇ plane shown in FIG. 3A and (0000).
- the prior art LPSO (Long Period Stack) structure is completely different from the present invention in that it is periodically stacked along the c-axis [0001] direction as shown in FIG.
- FIG. 3 and 4 show a state observed from the a-axis [-1-120] direction.
- FIG. 5 shows a state where the same crystal lattice is observed from the c-axis [000-1] direction (FIG. 5C). Even if it looks the same from the a-axis, a typical case of having periodicity in only one direction as shown in FIG. 5A and having periodicity in all three directions as shown in FIG. Two cases are assumed.
- the alloy of the present invention since the addition amount of Ca and Zn as segregation elements is very small, it is considered that the alloy has a periodic structure with periodicity in three directions as shown in FIG.
- an Mg alloy that can exhibit high strength without the need to use an expensive rare earth element RE and a method for producing the same are provided.
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Abstract
Description
CaおよびZnを固溶限度内で含有し、残部がMgおよび不可避的不純物から成る化学組成を有し、
等軸結晶粒から成り、該結晶粒内にMg六方格子のc軸方向に沿ったCaおよびZnの偏析領域があり、該偏析領域はMg六方格子のa軸方向にMg3原子間隔で並んでいる組織を有する
ことを特徴とする高強度Mg合金が提供される。
表1に示した各組成のMg-Ca-Zn合金を溶製した。
上記にて作製したインゴットに二酸化炭素雰囲気中で480~520℃×24hrの熱処理を施し、均質化(溶体化)した。
表1に示した温度、押出し比で1段階または2段階の熱間押出し加工を行った。
《機械的性質》
押出し方向に平行な方向について引張試験を行いった。破断伸び、0.2%耐力、0.2%比強度を表1に示す。全体として、押出し温度および押出し比に応じて、0.2%耐力280~482MPaおよび0.2%比強度160~275kNm/kgの高強度と6%~23%の良好な破断伸びが得られた。
透過電子顕微鏡(TEM)により組織観察を行なって測定した平均結晶粒径と周期構造の有無を表1に示す。試料名0309CZ-1(組成:Mg-0.3at%Ca-0.9at%Zn、第2押出し温度:238℃)および試料名0306CZ-1(組成:Mg-0.3at%Ca-0.6at%Zn、第2押出し温度:236℃)の場合に、明瞭な周期構造が観察された。
Claims (5)
- CaおよびZnを固溶限度内で含有し、残部がMgおよび不可避的不純物から成る化学組成を有し、
等軸結晶粒から成り、該結晶粒内にMg六方格子のc軸方向に沿ったCaおよびZnの偏析領域があり、該偏析領域はMg六方格子のa軸方向にMg3原子間隔で並んでいる組織を有する
ことを特徴とする高強度Mg合金。 - 請求項1において、Ca:0.5at%以下およびZn:3.5at%以下を含有することを特徴とする高強度Mg合金。
- 請求項1または2において、上記CaおよびZnの含有量が原子比でCa:Zn=1:2~1:3の範囲内であることを特徴とする高強度Mg合金。
- 請求項1から3のいずれか1項に記載の高強度Mg合金を製造する方法であって、Mgに上記組成に対応する配合量でCaおよびZnを添加し、溶解および鋳造して形成したインゴットを均質化熱処理した後、熱間加工を施すことにより請求項1記載の組織とすることを特徴とする高強度Mg合金の製造方法。
- 請求項4において、上記熱間加工を少なくとも1回300℃以上の温度で行うことを特徴とする高強度Mg合金の製造方法。
Priority Applications (3)
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JP2013542987A JP5787380B2 (ja) | 2011-11-07 | 2012-11-06 | 高強度Mg合金およびその製造方法 |
US14/356,502 US9523141B2 (en) | 2011-11-07 | 2012-11-06 | High strength Mg alloy and method for producing same |
CN201280054636.3A CN104011238B (zh) | 2011-11-07 | 2012-11-06 | 高强度Mg合金及其制造方法 |
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JP2011243183 | 2011-11-07 | ||
JP2011-243183 | 2011-11-07 |
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JP (1) | JP5787380B2 (ja) |
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WO2016038892A1 (ja) * | 2014-09-09 | 2016-03-17 | 国立大学法人神戸大学 | 生体軟組織固定用デバイスおよびその作製方法 |
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ES2797499T3 (es) | 2012-06-26 | 2020-12-02 | Biotronik Ag | Esta solicitud de patente se refiere a un implante hecho de una aleación de magnesio y a un método para la producción del mismo |
SG11201406026TA (en) | 2012-06-26 | 2014-10-30 | Biotronik Ag | Magnesium-zinc-calcium alloy, method for production thereof, and use thereof |
SG11201406024QA (en) | 2012-06-26 | 2014-10-30 | Biotronik Ag | Magnesium alloy, method for the production thereof and use thereof |
US9994935B2 (en) * | 2013-09-26 | 2018-06-12 | Northwestern University | Magnesium alloys having long-period stacking order phases |
EP3741880B1 (en) * | 2019-05-20 | 2023-06-28 | Volkswagen AG | Sheet metal product with high bendability and manufacturing thereof |
KR102095813B1 (ko) * | 2019-11-28 | 2020-04-03 | 유앤아이 주식회사 | 생체분해성 금속합금 제조방법 |
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- 2012-11-06 JP JP2013542987A patent/JP5787380B2/ja active Active
- 2012-11-06 CN CN201280054636.3A patent/CN104011238B/zh not_active Expired - Fee Related
- 2012-11-06 US US14/356,502 patent/US9523141B2/en active Active
- 2012-11-06 WO PCT/JP2012/078734 patent/WO2013069638A1/ja active Application Filing
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Cited By (6)
Publication number | Priority date | Publication date | Assignee | Title |
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WO2016038892A1 (ja) * | 2014-09-09 | 2016-03-17 | 国立大学法人神戸大学 | 生体軟組織固定用デバイスおよびその作製方法 |
JPWO2016038892A1 (ja) * | 2014-09-09 | 2017-04-27 | 国立大学法人神戸大学 | 生体軟組織固定用デバイスおよびその作製方法 |
KR20170053640A (ko) | 2014-09-09 | 2017-05-16 | 고쿠리츠다이가쿠호진 고베다이가쿠 | 생체 연조직 고정용 디바이스 및 그 제작방법 |
RU2688064C2 (ru) * | 2014-09-09 | 2019-05-17 | Нэшнл Юниверсити Корпорейшн Кобэ Юниверсити | Устройство для фиксации мягкой биологической ткани и способ его производства |
AU2015313647B2 (en) * | 2014-09-09 | 2020-04-09 | National University Corporation Kobe University | Device for fixing biological soft tissue, and method for producing same |
US10994056B2 (en) | 2014-09-09 | 2021-05-04 | National University Corporation Kobe University | Device for fixing biological soft tissue, and method for producing same |
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JP5787380B2 (ja) | 2015-09-30 |
US20150047756A1 (en) | 2015-02-19 |
CN104011238A (zh) | 2014-08-27 |
JPWO2013069638A1 (ja) | 2015-04-02 |
CN104011238B (zh) | 2016-06-01 |
US9523141B2 (en) | 2016-12-20 |
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