热处理对Ni_(47)Ti_(44)Nb_9记忆合金约束态恢复力的影响  

Effect of Heat-treatment on Constrained Recovery Stress of Ni_(47)Ti_(44)Nb_9 Shape Memory Alloys

作　　者：杨根林[1] 王晓震[1] 王二敏[1] 韩劲[1] 倪志铭[1] 

机构地区：[1]北京航空材料研究院,北京100095

出　　处：《航空材料学报》2010年第4期16-20,共5页Journal of Aeronautical Materials

摘　　要：研究了热处理对Ni47Ti44Nb9记忆合金温度和应变对恢复应力的影响。利用变温拉伸机和微机热膨胀仪等研究了温度和应变对恢复应力的影响。Ni47Ti44Nb9合金相变应变随着变形温度的降低而明显升高,残余应变随着变形温度的降低而降低,弹性恢复应变随着变形温度的降低而略微升高。Ni47Ti44Nb9合金变形后约束加热至较高温度(150℃)后仍残留有马氏体相;超过As′温度后恢复力迅速增加,到150℃时恢复力已经接近最高值。加热温度对恢复力的大小有明显影响,随温度降低,恢复力下降。热循环对恢复力大小影响不明显。The effects of heat-treatment on constrained recovery stress of Ni47Ti44Nb9 shape memory alloys were investigated.The influence of temperature and the strain on recovery stress was studied by the mechanical tester and the PC controlled dilatometer.Transition strain of Ni47Ti44Nb9 alloys increases remarkably with the decreasing temperature.The residual strain decreases and the elastic recovery strain increases slightly with decreasing the deformation temperature.Residual martensite phase appears when heating the constrained Ni47Ti44Nb9 to 150℃.The recovery stress increases rapidly when the temperature reaches the As′ temperature,and maximizes at 150℃.The recovery stress depends on the temperature：the decrease of temperature lead to the decay of the recovery stress.Thermal cycling treatment has on significant effect on the recovery stress.

关 键 词：热处理 NI47TI44NB9 记忆合金 恢复应力 

分 类 号：TG156[金属学及工艺—热处理]