Superplasticity in a Mg-8 mass%Li Two-Phase Alloy Processed by an ECAP Method

• Furui Mitsuaki

  Department of System Engineering of Materials and Life Science, Faculty of Engineering, University of Toyama

• Xu Cheng

  Departments of Aerospace & Mechanical Engineering and Materials Science, University of Southern California

• Aida Tetsuo

  Department of Mechanical and Intelligent System Engineering, Faculty of Engineering, University of Toyama

• Inoue Makoto

  Department of Ecomaterials Engineering, Toyama National College of Technology

• Anada Hiroshi

  Department of System Engineering of Materials and Life Science, Faculty of Engineering, University of Toyama

• Langdon Terence G.

  Departments of Aerospace & Mechanical Engineering and Materials Science, University of Southern California

Bibliographic Information

Other Title

• ＥＣＡＰ加工を施したＭｇ‐８ｍａｓｓ％Ｌｉ２相合金の超塑性
• ECAP加工を施したMg-8 mass%Li2相合金の超塑性
• ECAP カコウ オ ホドコシタ Mg 8 massパーセントLi2 ソウ ゴウキン ノ チョウソセイ

Abstract

  Significant phase refinement and dispersion were achieved in a cast Mg-8 mass%Li alloy through processing by equal-channel angular pressing (ECAP) using a die having an internal channel angle of 110° and a pressing temperature of 473 K. Following extrusion and subsequent ECAP through 2 passes, the alloy exhibited superplasticity over the temperature range from 423 to 473 K. A maximum fracture elongation of >950% was attained at 473 K with an initial strain rate of 1.0×10^-4 s^-1. The measured strain rate sensitivity was of the order of 0.6. The maximum elongation is high in comparison with other Mg alloys tested in tension at the same temperature and strain rate. The activation energy for superplastic flow was essentially equal to the value for grain boundary diffusion of Mg. The use of ECAP gives a significant improvement in strength and ductility at room temperature.<br>

Journal

• Journal of the Japan Institute of Metals and Materials

  Journal of the Japan Institute of Metals and Materials 70 (9), 729-734, 2006

  The Japan Institute of Metals and Materials

Keywords

• equal-channel angular pressing
• magnesium-lithium alloy
• strain rate sensitivity
• superplasticity

Details

• CRID: 1390282681456637056
• NII Article ID: 10018249582
• NII Article ID: 130004455757
• NII Book ID: AN00187860
• DOI: 10.2320/jinstmet.70.729
• ISSN: 18806880
• ISSN: 24337501
• ISSN: 00214876
• NDL BIB ID: 8524494
• Web Site: https://ndlsearch.ndl.go.jp/books/R000000004-I8524494
• Web Site: https://www.jstage.jst.go.jp/article/jinstmet/70/9/70_9_729/_pdf
• Text Lang: ja
• Data Source:
  • JaLC
  • NDL
  • Crossref
  • CiNii Articles
  • KAKEN
• Abstract License Flag: Disallowed