纺织学报 ›› 2010, Vol. 31 ›› Issue (3): 15-19.

• 纤维材料 • 上一篇    下一篇

Ni-Ti形状记忆合金纤维相变的电阻特性

徐 磊;王 瑞;张淑洁

  

  1. 天津工业大学纺织学院
  • 收稿日期:2009-04-07 修回日期:2009-07-30 出版日期:2010-03-15 发布日期:2010-03-15
  • 通讯作者: 王瑞

Electrical resistance properties of Ni-Ti shape memory alloy fiber in phase transformation

XU Lei; WANG Rui; ZHANG Shujie

  

  1. School of Textiles, Tianjin Polytechnic University
  • Received:2009-04-07 Revised:2009-07-30 Online:2010-03-15 Published:2010-03-15

摘要: 相变温度是决定形状记忆合金纤维的加工与使用的重要性能参数。以Ni-Ti合金纤维为例,为研究其相变过程中温度与电阻之间的关系,基于纤维内部马氏体生长模型和电阻的混合定律,建立了Ni-Ti合金的电阻特性模型,研究了自由状态下Ni-Ti纤维电阻率与温度之间的关系。设计电阻法温度测量装置及信号采集系统,对自由状态下的Ni-Ti纤维进行测试,通过对纤维电阻率-温度曲线求导,测得Ni含量为55.5 a.t.%纤维试样的四个相变温度分别为Ms=34.4℃,Mf=25.6℃,As=39.4℃,Af=51.1℃,与纤维DSC法测试结果对比发现:通过电阻、温度的同步测量可以有效地探测纤维的相变,相变温度可通过电阻率-温度导函数准确标定。

Abstract: Phase transition temperatures are the key parameters that decide the processing and operating temperatures. In this paper, Transformation of Ni-Ti shape memory alloy fiber was investigated by electrical resistance method. The relationship between the resistivity and temperature was derived by logistic’s martensite volume growth model and mixing rule. A signal acquisition system is established to measure the resistance and temperature of the Ni-Ti fiber. By the derivation of resistance-temperature curves, the measured phase transition temperatures of the Ni% 55.5a.t.% fiber sample are Ms = 34.4 ℃, Mf = 25.6 ℃, As = 39.4 ℃and Af = 51.1℃, respectively. Compare with the DSC testing method, the electrical resistance method is more accurate, thus can detect the fiber phase transformation more effectively.

中图分类号: 

  • TP242
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