Clarification of crystallization mechanisms through evaluating a residual amorphous state

2017 Fiscal Year Final Research Report

• Project/Area Number: 16K18227
• Research Category: Grant-in-Aid for Young Scientists (B)
• Allocation Type: Multi-year Fund
• Research Field: Physical properties of metals/Metal-base materials
• Research Institution: Tohoku University
• Principal Investigator: Yamada Rui 東北大学, 学際科学フロンティア研究所, 助教 (40706892)
• Research Collaborator: TANAKA Naoyuki 東北大学, 大学院工学研究科, 院生 ; GUO Wei 東北大学, 学際科学フロンティア研究所, 教育研究支援者 ; SAIDA Junji 東北大学, 学際科学フロンティア研究所, 教授
• Project Period (FY): 2016-04-01 – 2018-03-31
• Keywords: 残留アモルファス構造 / 結晶化

Outline of Final Research Achievements

Rapid cooling system for bulk meallic glassy samples was constructed and Zr,Pd based samples with various random structures were successfully prepared. TEM observations were conducted to observe the initial nucleation and crystal growth stages in metallic glasses and viscoelastic measurements were performed to evaluate the residual amorphous states. It was difficult to clarify which relaxation regions relates to each crystallization step, but we got another new findings cocerning the crystallization of metallic glasses. We revealed for the first time that the crystallization and rejuvenation area, which are apparently oposite energy state regions, can be coexisted in the glassy structure.
Our findings will provide beneficial information for the crystallization studies of metallic glasses.

Free Research Field

金属ガラス