A new method for evaluating stress-strain properties of metals using ultra-microhardness technique

K. Yasuda, K. Shinohara, M. Yamada, M. Kutsuwada, C. Kinoshita

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Abstract

A new method for evaluating the yield stress σ0.2 and the strain-hardening exponent n of metals is proposed through ultra-microhardness (UMH) technique with an application to fcc metals. UMH measurements with a triangular-base pyramidal indenter have been conducted on copper and copper-aluminum alloys under cold-rolled and annealed conditions at loads ranging from 0.05 g (4.9 × 10-2 mN) to 50 g (49 mN), and their results are compared with those of the Vickers hardness (Hv) at 200 g (1.96 N) and of tensile tests. The method is based on Cahoon et al.'s relation that σ0.2(MPa) = 3.27Hv (0.1)n and is composed of (i) the determination of the relationship between Hv and ultra-microhardness (Hum), (ii) the evaluation of n through analyzing the load dependence of Hum and (iii) the evaluation of σ0.2 from Cahoon et al.'s relation together with the results on (i) and (ii). The value of n can be extracted through the UMH test, and the value of σ0.2 evaluated from the present method, shows good coincidence with that obtained by tensile tests.

Original languageEnglish
Pages (from-to)109-116
Number of pages8
JournalJournal of Nuclear Materials
Volume187
Issue number2
DOIs
Publication statusPublished - Apr 1992

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All Science Journal Classification (ASJC) codes

  • Nuclear and High Energy Physics
  • Materials Science(all)
  • Nuclear Energy and Engineering

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