The effect of cyclic strain path on the properties and structure of CuAl10 aluminium bronze

Abstract

The improvement of metals formability by proper control of temperature, strain rate, and strain has been rather exhausted. The other way to obtain this goal is proper control of strain path. In the case of sheet metals the effect of strain path is widely known, but in massive metal forming processes that phenomena have been just under investigations. In the paper the effects of different cyclic strain paths on the mechanical properties and structures of CuAl10 aluminium bronze have been described. The strain paths contain various cyclic torsions. The amplitude was changed in the range of 0.01–0.6, temperature from 20 to 650°C and strain rate from 0.01 to 1s−1. The properties and structures obtained in cyclic strain paths are compared with those gained in monotonic torsion. It has been found that the flow stress in minor cyclic torsion is substantially dependent on cyclic conditions, mainly the strain amplitude used. The strain paths similar to those applied in the investigations are observed in some industrial processes.