Trial measurement of interfacial strength in multi-phase materials using micropillar compression tests

2017 Fiscal Year Final Research Report

• Project/Area Number: 16K14412
• Research Category: Grant-in-Aid for Challenging Exploratory Research
• Allocation Type: Multi-year Fund
• Research Field: Structural/Functional materials
• Research Institution: Nagoya University
• Principal Investigator: Takata Naoki 名古屋大学, 工学研究科, 准教授 (70432523)
• Research Collaborator: KOBASHI Makoto 名古屋大学, 大学院工学研究科, 教授 (90225483)
• Project Period (FY): 2016-04-01 – 2018-03-31
• Keywords: マイクロピラー / 強度 / 変形 / アルミニウム / 複合材料

Outline of Final Research Achievements

We have examined the compression response of single-crystal cylindrical micropillars with different diameters (approximately ranging from 1 to 10 micrometers) and shape parameters prepared on the sample surface of pure aluminum (Al) sheets. The compression tests for micropillars with various sizes demonstrated the flow stress of micropillars increases with decreasing pillar diameter. The compression response of micropillars with different d1/d2 (ratio of top diameter (d1) to bottom diameter (d2) of cylindrical micropillars) revealed higher d1/d2 than 0.5 is required for precisely measuring their strength. In order to evaluate the interfacial strength between metal and ceramics, the two-phase micropillars were prepared from Co/WC composites. These micropillars exhibit the strain burst at a fixed stress level.The measured stress level would correspond to the interfacial strength (stress level reqired for localized deformation in the vicinity of the interface).

Free Research Field

材料強度学