Materials Transactions Online

Transactions of the Japan Institute of Metals, Vol. 22 No. 5 (1981) pp.326-336
© 1981 The Japan Institute of Metals

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

Yoshinari Kaieda** and Atsushi Oguchi**

Bending tests at atmospheric pressure and at 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 the bending load-deflection relation and fracture surface, the fractue modes in the pressure and temperature ranges tested have been grouped into five types, 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 influenced remarkably by hydrostatic pressure, and the specimens could be bent without crack formation by the application of hydrostatic pressure of the same order of intensity as the flow stress of the material.

(Received October 18, 1980)


*This paper was originally published in Japanese in J. Japan Inst. Metals, 43 (1979), 1158.
**National Research Institute for Metals, 2-3-12, Nakameguro Meguro-ku, Tokyo 153, Japan.

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