恒载荷下TiNi和TiNiCu形状记忆合金弹簧的热稳定性  

Thermal stability of TiNi and TiNiCu alloy memory springs under constant loads

作　　者：石美玉[1] 孟祥龙[2] 

机构地区：[1]黑龙江工程学院汽车工程系,黑龙江哈尔滨150050 [2]哈尔滨工业大学材料科学与工程学院,黑龙江哈尔滨150001

出　　处：《哈尔滨工程大学学报》2008年第4期416-419,共4页Journal of Harbin Engineering University

基　　金：黑龙江省教育厅科学技术研究资助项目(11511308)

摘　　要：TiNi基形状记忆合金弹簧是一种有广阔应用前景的形状记忆合金驱动元件.研究了在电流加热方式下,不同加热温度,不同恒载荷作用下TiNi和TiNiCu记忆合金弹簧的热稳定性.研究表明,恒定载荷下,最初的几次循环后,弹簧的行程变小,而在循环次数超过一定次数后,弹簧的行程不随着循环次数的增加而发生明显变化.对于TiNi和TiNiCu记忆合金弹簧,过热和过载均会向弹簧中引入不可逆的塑性变形,导致其热稳定性的下降.由于Ti3Ni4相粒子的析出强化了基体,在恒载荷下,TiNi合金弹簧较TiNiCu合金弹簧显示出更加良好的热稳定性.TiNi alloy based memory springs are promising actuators for engineering apphcatlons. This paper discusses the thermal stability of TiNi and TiNiCu alloy memory springs under different loads and at various temperatures, heated by direct current. The research results showed that, in the first few thermal cycles under constant load, the stroke of the spring decreases, but it remains almost constant with further thermal cycles. For TiNi and TiNiCu alloy memory springs, over-heating and over-loading leads to the deterioration of thermal stability due to plastic deformation. Under the same constant load, TiNi alloy springs showed better thermal stability than TiNiCu alloy springs because precipitation of Ti3Ni4 particles strengthens the matrix.

关 键 词：TINI合金 TINICU合金 形状记忆 弹簧 热稳定性 

分 类 号：TG131[一般工业技术—材料科学与工程]