Origin of mechanical property improvement in bulk metallic glasses through microstructural control

2017 Fiscal Year Final Research Report

• Project/Area Number: 16K18267
• Research Category: Grant-in-Aid for Young Scientists (B)
• Allocation Type: Multi-year Fund
• Research Field: Material processing/Microstructural control engineering
• Research Institution: Toyohashi University of Technology
• Principal Investigator: Adachi Nozomu 豊橋技術科学大学, 工学(系)研究科(研究院), 助教 (00758724)
• Project Period (FY): 2016-04-01 – 2018-03-31
• Keywords: アモルファス / 金属ガラス / 巨大ひずみ加工 / 延性 / 活性化体積

Outline of Final Research Achievements

In this study, we succeed to fabricated a bulk metallic glass having tensile plastic elongation with pronounced free volume and beta relaxation, which is thought to be important structural factor for ductility improvement by employing plastic deformation and annealing processes. From a perspective of plastic deformation behavior in both tensile and nanoindentation tests, it was found that the activation volume for plastic deformation is close to that for beta relaxation, implying that the plastic deformation in the sample is governed by the beta relaxation. Furthermore, it was suggested that inhomogeneous structure with nano to micrometer size having free volume and compositional fluctuation, which is closely related to beta relaxation, through microstructural analysis using quantum beams

Free Research Field

金属材料組織学