Threshold Stress for High-Temperature Deformation of Dispersion-Strengthened Alloys.

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概要

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• In order to identify the mechanism originating the threshold stress for the high-temperature deformation of dispersion-strengthened alloys, stress-change tests were conducted during deformation of an Al-1.5 vol%Be alloy. It was found that the instantaneous strain on the increase in applied stress was absolutely elastic when the stress-increment Δσ was below a certain value Δσc, an instantaneous plastic strain was observed for Δσ>Δσc, whereas the strain was always elastic for a stress-decrement. The critical stress Δσc depended on temperature and showed a maximum in a temperature range from 570K to 620K. From these findings it is discussed that the threshold stress should be determined by the Srolovitz mechanism.

• 日本学士院の論文

著者

• NAKASHIMA Hideharu

  Department of Electrical and Material Sciences, Faculty of Engineering Sciences, Kyushu University

• NOGUCHI Kunihiro

  Graduate School of Science and Technology, Kumamoto University

• Yoshinaga Hideo

  Department Of Materials Science And Technology Graduate School Of Engineering Sciences Kyushu Univer

• Nakashima Hideharu

  Department of Materials Science and Technology, Graduate School of Engineering Sciences, Kyushu University

• YOSHIDA Fuyuki

  Department of Materials Science and Technology, Graduate School of Engineering Sciences, Kyushu University

• NOGUCHI Kunihiro

  Graduate School Student, Kyushu University

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• Threshold Stress for High-Temperature Deformation of Dispersion-Strengthened Alloys.

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