Origin of temperature memory effect of stress releasing in amorphous alloys

2017 Fiscal Year Final Research Report

• Project/Area Number: 15K06418
• Research Category: Grant-in-Aid for Scientific Research (C)
• Allocation Type: Multi-year Fund
• Section: 一般
• Research Field: Physical properties of metals/Metal-base materials
• Research Institution: Hokkaido University
• Principal Investigator: Ohnuma Masato 北海道大学, 工学研究院, 教授 (90354208)
• Project Period (FY): 2015-04-01 – 2018-03-31
• Keywords: 凍結弾性ひずみ / 非晶質構造の不均質性 / 熱膨張 / 粘性の空間不均質性

Outline of Final Research Achievements

Temperature memory effect of stress releasing in amorphous ribbons was studied by transmission XRD, thermal expansion, and nano-indentation. The amount of quenched strain becomes large with increasing annealing temperature. The deviation to higher temperature occurs with increasing the holding time in the first stage, while the opposite happens with decreasing the holding time. Those results can be explained by newly proposed model with hetero-structure of viscousity in the amorphous ribbons. The predicted size of those heterostructure can be relatively large, in the scale from a few 10 to a few 100 nm, suggested by nano-dentation results.

Free Research Field

散乱・回折、非晶質合金、金属材料