EFFECTS OF TEMPERATURE AND DISPERSE PHASE OF DISORDERED-GAMMA ON STRAIN-HARDENING RATE OF NI3AL

Investigations have been made on the effects of temperature and fine d isperse phase of disordered gamma on strain hardening rate of Ni3Al ba sed alloy. The result is found that there exists a peak temperature fo r the strain hardening rate of Ni3Al based alloy below the peak temper ature of its yield strength. Analysis shows that the appearance of the peak temperature of strain hardening rate is caused by both the decre asing of the movability of <101> superdislocations on {111} slip plane and the increasing of the dynamic recovery in Ni3Al with increasing t emperature. A Ni3Al based alloy hardened by disperse phase of disorder ed gamma has been obtained by controlling chemical composition and tre ating processes. The peak temperature of strain hardening rate of this alloy is increased due to the fine disperse phase of disordered gamma , which causes the reductions of the movability of the superdislocatio ns and the dynamic recovery in Ni3Al.