摘要
Activation volume V , activation enthalpy Δ H , activation free enthalpy Δ G and activation entropy Δ S of tensile deformation of Ti 47Al 2Mn 2Nb alloy with near lamellar microstructure were measured at yield point using strain rate jumping method in a temperature range from 77 K to 1 373 K. Based on the measured values of activation parameters and temperature dependence of tensile properties, different thermally activated dislocation motion mechanisms were speculated to control tensile deformation of the alloy in three temperature regions: in low temperature region (77～398 K), the mechanism is mainly characterized by the overcoming of Peierls Nabarro friction; in intermediate temperature region (398～1 073 K), the mechanism is an abnormally weak thermal activated motion; in high temperature region (1 073～1 373 K), dislocation climbing is the controlling mechanism.
Activation volume V , activation enthalpy Δ H , activation free enthalpy Δ G and activation entropy Δ S of tensile deformation of Ti 47Al 2Mn 2Nb alloy with near lamellar microstructure were measured at yield point using strain rate jumping method in a temperature range from 77 K to 1 373 K. Based on the measured values of activation parameters and temperature dependence of tensile properties, different thermally activated dislocation motion mechanisms were speculated to control tensile deformation of the alloy in three temperature regions: in low temperature region (77～398 K), the mechanism is mainly characterized by the overcoming of Peierls Nabarro friction; in intermediate temperature region (398～1 073 K), the mechanism is an abnormally weak thermal activated motion; in high temperature region (1 073～1 373 K), dislocation climbing is the controlling mechanism.
出处
《中国有色金属学会会刊：英文版》
CSCD
1999年第S1期290-297,共8页
Transactions of Nonferrous Metals Society of China
