温度和应变率历史对拉伸载荷下铁基记忆合金本构关系影响的研究

Research for temperature and strain-rate history effects on constitutive relation of Fe-base shape memory alloy under tension

在 2 0～ 5 0 0℃和 0 .0 0 2 0 8～ 193s-1的范围内研究了温度和应变率历史对拉伸载荷下铁基记忆合金本构关系的影响。实验结果表明 ,应变率历史对该材料具有强化作用 ,而且随着预应变率的提高 ,其强度提高 ,延伸率降低。

The effects of temperature and strain-rate history on the constitutive relations of Fe-base shape memory alloy under tension have been studied at temperature range from 20℃ to 500℃ and strain-rate range from 0.002?08s -1 to 193s -1 . The experimental results show that the strain-rate history strengthens this material, and the strength increases and the elongation decreases with the rising prestrain rate.The sensitivity of the material to the strain-rate history decreases with the rising temperature.