Development of Mg alloy with both high strength and high damping capacity through introducing twinning boundaries

2014 Fiscal Year Final Research Report

• Project/Area Number: 24760591
• Research Category: Grant-in-Aid for Young Scientists (B)
• Allocation Type: Multi-year Fund
• Research Field: Material processing/treatments
• Research Institution: Tohoku University
• Principal Investigator: LI Yunping 東北大学, 金属材料研究所, 助教 (80546862)
• Project Period (FY): 2012-04-01 – 2015-03-31
• Keywords: Mg合金 / 制振性 / 双晶 / 変形 / 熱処理 / 転移

Outline of Final Research Achievements

Enhancing both the mechanical property and damping capacity is of great importance for a wider usage of magnesium alloys. However, the current research of high damping magnesium alloys is carried out on the basis of dislocation/matrix interactions, which is not capable of solving the above mentioned problem. In the present research, a novel concept of “high damping magnesium alloy of twin type”is proposed for the first time. This is based on the fact that boundaries oftensile twin in magnesium alloys are movable and they can shrink and grow even at extremely low stress. Magnesium alloys with high damping capacity are achieved via introducing high density of tensile twin boundaries through pre-deformation and optimizing the twin boundary mobility by a subsequent heat treatment yet withoutsacrificing the mechanical properties.

Free Research Field

材料工学