Microstructure control of Mg-Zn-Y alloy for the improvement of mechanical properties

2015 Fiscal Year Final Research Report

• Project/Area Number: 25420770
• Research Category: Grant-in-Aid for Scientific Research (C)
• Allocation Type: Multi-year Fund
• Section: 一般
• Research Field: Material processing/Microstructural control engineering
• Research Institution: Akita University
• Principal Investigator: Saito Kaichi 秋田大学, 工学(系)研究科(研究院), 教授 (10302259)
• Co-Investigator(Renkei-kenkyūsha): HIRAGA Kenji 東北大学, 名誉教授 (30005912)
• Project Period (FY): 2013-04-01 – 2016-03-31
• Keywords: 結晶・組織制御 / マグネシウム合金

Outline of Final Research Achievements

Microstructure control for Mg-Y-Zn alloy system, by a combined technique of the addition of a few other rare earth elements (RE) such as Ce and Gd and hot-rolling treatment additionally employed, has been thoroughly investigated in an attempt to improve its mechanical properties. The Ce addition of an appropriate amount to the alloy allows GP-zones to form densely in a dual microstructure of LPSO phase and Mg-solid solution. The Gd addition, instead, allows fine precipitates of Mg7RE orthorhombic phase (’-phase) to coexist. The substitution of Al for Zn in a part or all make the existing LPSO phase more highly ordered. Furthermore, it has proved that a combination of hot-rolling and low-temperature aging treatment can cause a refinement of precipitates. It is, thus, suggested that all of these alloying and thermomechanical treatments tested in this study are substantially effective in improving the mechanical property.

Free Research Field

材料物理学