Fabrication of magnesium alloys with high workability based on systematic understanding of twin-dislocation interaction

• Project/Area Number: 26289257
• Research Category: Grant-in-Aid for Scientific Research (B)
• Allocation Type: Partial Multi-year Fund
• Section: 一般
• Research Field: Structural/Functional materials
• Research Institution: Kyoto University
• Principal Investigator: MABUCHI Mamoru 京都大学, エネルギー科学研究科, 教授 (00358061)
• Co-Investigator(Kenkyū-buntansha): 中野 裕美 豊橋技術科学大学, 学内共同利用施設等, 教授 (00319500) ; 千野 靖正 国立研究開発法人産業技術総合研究所, その他部局等, 研究員 (50357498)
• Project Period (FY): 2014-04-01 – 2017-03-31
• Project Status: Completed (Fiscal Year 2016)
• Budget Amount: ¥16,900,000 (Direct Cost: ¥13,000,000、Indirect Cost: ¥3,900,000); Fiscal Year 2016: ¥1,950,000 (Direct Cost: ¥1,500,000、Indirect Cost: ¥450,000); Fiscal Year 2015: ¥2,340,000 (Direct Cost: ¥1,800,000、Indirect Cost: ¥540,000); Fiscal Year 2014: ¥12,610,000 (Direct Cost: ¥9,700,000、Indirect Cost: ¥2,910,000)
• Keywords: マグネシウム / マグネシウム合金 / 双晶

Outline of Final Research Achievements

Interaction between twin and dislocation in Mg alloys and the effect of element addition have been investigated for the improvement in workability. Commercially available AZ31 extrusions were multidirectionally compressed for twin generation in the material with high density. The microstructural observations suggested that the geometric compatibility between two types of twins is the determinant for the variant selection. Also, the first-principles calculations and experimental results on the Mg-Zn-X alloys with high Erichsen value revealed that the ratio of general stacking fault energy for basal slip to that for prismatic slip determines macroscopic workability of Mg alloys (with minor exception). Atomic models including double twins and screw dislocation indicated that segregation of added elements critically disturbs the interaction between the twin and dislocation.

Research Products

• [Journal Article] An atomistic study of Y segregation at a {10-11}-{10-12} double twin in Mg (2017)
  • Author(s): N. Miyazawa, S. Suzuki, M. Mabuchi, Y. Chino
  • Journal Title: AIP advances Volume: 7 Issue: 3 Pages: 035308-035308
  • DOI: 10.1063/1.4978534
  • Peer Reviewed / Open Access
• [Journal Article] Effect of segregated elements on the interactions between twin boundaries and screw dislocations in Mg (2015)
  • Author(s): T. Yoshida, M. Yuasa, M. Mabuchi, Y. Chino
  • Journal Title: J. Appl. Phys. Volume: 118 Issue: 3
  • DOI: 10.1063/1.4926947
  • Peer Reviewed
• [Journal Article] Effects of group II elements on the cold stretch formability of Mg-Zn alloys (2014)
  • Author(s): Motohiro Yuasa, Naoki Miyazawa, Makoto Hayashi, Mamoru Mabuchi and Yasumasa Chino
  • Journal Title: Acta Materialia Volume: 83 Pages: 294-303
  • DOI: 10.1016/j.actamat.2014.10.005
  • Peer Reviewed / Acknowledgement Compliant
• [Journal Article] Mechanical and chemical effects of solute elements on generalized stacking fault energy of Mg (2014)
  • Author(s): Motohiro Yuasa, Yasumasa Chino and Mamoru Mabuchi
  • Journal Title: Journal of Materials Research Volume: 29 Issue: 21 Pages: 2576-2586
  • DOI: 10.1557/jmr.2014.270
  • Peer Reviewed
• [Journal Article] Twinning behaviour of AZ31 Mg alloy alternately compressed in two orthogonal directions (2014)
  • Author(s): Hyukjoon Kwon, Hiromi Nakano, Mamoru Mabuchi and Yasumasa Chino
  • Journal Title: Philosophical Magazine Volume: 94 Issue: 34 Pages: 3960-3977
  • DOI: 10.1080/14786435.2014.973920
  • NAID: 120005657919
  • Peer Reviewed / Acknowledgement Compliant
• [Journal Article] {10-12} twins in the rolled Mg–Zn–Ca alloy with high formability (2014)
  • Author(s): H. Nakano, M. Yuasa, M. Mabuchi and Y. Chino
  • Journal Title: J. Mater. Res. Volume: 29 Issue: 24 Pages: 3024-3031
  • DOI: 10.1557/jmr.2014.358
  • Peer Reviewed
• [Presentation] Mgの二重双晶に及ぼすＹ偏析の影響の原子シミュレーション (2016)
  • Author(s): 鈴木俊也、宮澤直己、袴田昌高 、馬渕守、千野靖正
  • Organizer: 日本機械学会M&M2016材料力学カンファレンス
  • Place of Presentation: 神戸
  • Year and Date: 2016-10-09
• [Presentation] Mg-Y合金における双晶転位に及ぼす偏析の影響のMC/MDシミュレーション (2016)
  • Author(s): 鈴木俊也，宮澤直己，袴田昌高，馬渕守
  • Organizer: 日本塑性加工学会平成28年度塑性加工春季講演会
  • Place of Presentation: 京都
  • Year and Date: 2016-05-22
• [Presentation] Stretch formability of Mg-Zn-X alloys (X=Ca, Sr and Ba)：experimental and first-principles studies (2016)
  • Author(s): Motohiro Yuasa, Naoki Miyazawa, Mamoru Mabuchi and Yasumasa Chino
  • Organizer: International Symposium on Plasticity 2016
  • Place of Presentation: Sheraton Kona Resort and Spa（ハワイ、米国）
  • Year and Date: 2016-01-05
  • Int'l Joint Research
• [Presentation] マグネシウムの双晶生成に及ぼす添加元素の影響の分子動力学計算 (2015)
  • Author(s): 宮澤直己, 袴田昌高, 馬渕守
  • Organizer: 軽金属学会2015年冬期若手研究者・院生による研究発表会
  • Place of Presentation: 大阪府立大学中百舌鳥キャンパス（大阪府堺市）
  • Year and Date: 2015-12-26
• [Presentation] マグネシウムの粒界エネルギーに及ぼす偏析元素の影響の第一原理計算 (2015)
  • Author(s): 宮澤直己、湯浅元仁、袴田昌高、千野靖正、馬渕守
  • Organizer: 日本金属学会2015年秋期講演大会
  • Place of Presentation: 九州大学伊都キャンパス（福岡県福岡市）
  • Year and Date: 2015-09-18
• [Presentation] マグネシウムの粒界エネルギーと自由体積の関係：第一原理解析 (2014)
  • Author(s): 宮澤直己，湯浅元仁，袴田昌高，馬渕守，千野靖正
  • Organizer: 日本機械学会 M&M2014材料力学カンファレンス
  • Place of Presentation: 福島大学金谷川キャンパス
  • Year and Date: 2014-07-18 – 2014-07-21