J. Japan Inst. Metals, Vol. 34, No. 8 (1970),
pp. 791-797

The Effect of Strain Rate on Intermediate Temperature Embrittlement of Copper (Study on the Dependence of Mechanical Properties of Metals upon the Strain Rate, 8th Report)

Masanobu Ohmori¹, Yoshitoyo Yoshinaga¹ and Hideyo Maniwa²

Abstract:

Two kinds of copper specimens, a pure copper for industrial use and an OFHC copper, were deformed under various stress states and strain rates at temperatures between room temperature and 600°C. Both of the coppers showed an intermediate temperature embrittlement (less ductility) when deformed slowly, but showed no embrittlement when deformed rapidly. Grain boundary slidings or cracks along boundaries were produced on the surfaces of the specimens deformed in a brittle manner. On the contrary, no boundary sliding and crack were found in the specimens deformed rapidly over a temperature range in which the slowly deformed specimens revealed slidings or cracks.
From the present study, it has been concluded that the intermediate temperature embrittlement of copper may be attributed to a viscous behaviour of grain boundaries.

(Received 1970/4/18)

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