The effects of tensile rate and rate shift point on tensile test of Nb47Ti alloy were studied by universal testing machine.The mechanical behavior of Nb47Ti alloy was analyzed by calculating true stress-strain curve,work hardening coefficient(n)and strain rate sensitivity coefficient(m).The results show that the work hardening ability of Nb47Ti alloy is very limited,and the ratio of yield strength to tensile strength approaching 1.With the increase of tensile rate,the work hardening effect decreases further.The tensile rate has a significant effect on strength,the strain rate sensitivity coefficient calculated by constant rate tensile method is 0.0263.In the two-stage tensile test,the stress value changes abruptly with the conversion of tensile rate,and the amplitude of abrupt change is relatively constant when transitions rate at different strains in work hardening stage,but it decreases with the increase of strain on the whole.This study can provide references for the selection of tensile rate and rate shift point during tensile test of Nb47Ti alloy.
关键词
Nb47Ti合金/应变速率敏感系数/拉伸速率/加工硬化指数/转速位置
Key words
Nb47Ti alloy/strain rate sensitivity coefficient/tensile rate/work hardening coefficient/rate shift point
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