日本金属学会誌

J. Japan Inst. Metals, Vol. 43, No. 12 (1979),
pp. 1158-1163

Brittle to Ductile Transition of a γ -Brass under High Hydrostatic Pressure and High Temperature

Yoshinari Kaieda1 and Atsushi Oguchi1

1National Research Institute for Metals, Tokyo

Abstract:

Bending tests at atmospheric pressure and under high hydrostatic pressures up to 800 MPa have been carried out in the temperature range above room temperature to 1000 K in order to make clear the influence of hydrostatic pressure on the brittle to ductile transition phenomenon of a very brittle Cu-Zn alloy (γ -Brass). From the observations of bending load-deflection relation and fracture surface, the fracture modes in the pressure and temeprature ranges tested have been grouped into five classes, and the change in mode due to pressure and temperature has been discussed. As a result, it was observed that the transition temperature from the transgranular cleavage type fracture to the other more ductile types was hardly influenced by hydrostatic pressure. However, the modes of fracture at higher temperatures were affected remarkably by hydrostatic pressure, and the spesimens became to be deformed largely without occurence of cracks by the application of hydrostatic pressure of the same order of magnitude as the flow stress of the material.


(Received 1979/05/4)

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