TY - JOUR

T1 - Development of the ultra-microhardness technique for evaluating stress-strain properties of metals

AU - Yasuda, K.

AU - Shinohara, K.

AU - Kinoshita, C.

AU - Yamada, M.

AU - Arai, M.

N1 - Funding Information:
In carrying out this work, one of the authors (KY) was supported by JSPS Fellowships for Japanese Junior Scientists and Inoue Foundation for Science.
Copyright:
Copyright 2014 Elsevier B.V., All rights reserved.

PY - 1994/9

Y1 - 1994/9

N2 - 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.

AB - 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.

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U2 - 10.1016/0022-3115(94)91116-9

DO - 10.1016/0022-3115(94)91116-9

M3 - Article

AN - SCOPUS:0028497214

VL - 212-215

SP - 1698

EP - 1702

JO - Journal of Nuclear Materials

JF - Journal of Nuclear Materials

SN - 0022-3115

IS - PART B

ER -