Development of the ultra-microhardness technique for evaluating stress-strain properties of metals

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

Research output: Contribution to journalArticle

8 Citations (Scopus)

Abstract

A method is proposed for evaluating the strain-hardening exponent (n) and the 0.2% yield stress (σ0.2) for fcc metals solely through the ultra-microhardness technique. To this end, ultra-microhardness (Hum) and Vickers hardness (Hv) measurements together with tensile tests were carried out for Ni and Al with various n and σ0.2. The value of (Hv is proportional to Hum at the load P, and the proportional constant depends on P but scarcely on metals. The ratio of um(P) Hum0(P) is scaled solely by n as a linear function independent of the specific metal, where Hum0(P) is the value of Hum(P) of specimens which show no strain-hardening. Based on the results and Cahoon's relation which relates Hv, σ0.2 and n, the values of n and σ0.2 are evaluated solely through the ultra-microhardness technique. The proposed equation can be explained in terms of a constitutive equation for polycrystalline metals.

Original languageEnglish
Pages (from-to)1698-1702
Number of pages5
JournalJournal of Nuclear Materials
Volume212-215
Issue numberPART B
DOIs
Publication statusPublished - Sep 1994

All Science Journal Classification (ASJC) codes

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

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