Effect of Nb content on martensitic transformation temperatures and mechanical properties of Ti-Ni-Nb shape memory alloys for pipe joint applications
Effect of Nb content on martensitic transformation temperatures and mechanical properties of Ti-Ni-Nb shape memory alloys for pipe joint applications
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DOI：
10.2320/matertrans.48.445
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发表时间：
2007-03-01
影响因子：
1.2
通讯作者：
Yamauchi, Kiyoshi
中科院分区：
文献类型：
--
作者：
Uchida, Kazunari;Shigenaka, Naoto;Yamauchi, Kiyoshi
研究了几种不同Nb含量(0~15mot%)或不同Ni/Ti原子比(1.0~1.1)的Ti-Ni-Nb形状记忆合金的马氏体相变温度和力学性能。Ni/Ti比为1.0,1173 K，300秒固溶处理的Ti-Ni-Nb合金的马氏体相变温度(ms、mR、A和A(F))随Nb含量的增加而降低。这些转变温度还取决于Ni/Ti比、热处理条件和冷加工率。在Nb含量为6mol%，Ni/Ti原子比小于1.05的合金中，断裂应力和断裂应变分别达到约1000 Mpa和20%以上。在此基础上，对Ti-Ni-Nb形状记忆合金的化学成分、制备工艺、热处理等工艺条件进行了优化，以开发形状记忆合金管接头。
Several Ti-Ni-Nb shape memory alloys (SMAs) with various Nb contents (0 similar to 15 mot%) or Ni/Ti atomic ratios (1.0 similar to 1.1) were tested to investigate the martensitic transformation temperatures and mechanical properties. The martensitic transformation temperatures (Ms, Mr,A, and A(f)) of the solution-treated Ti-Ni-Nb alloys at 1173 K for 300 seconds with Ni/Ti ratio of 1.0 decrease with increasing the Nb content. These transformation temperatures also depend on the Ni/Ti ratio, heat treatment condition and cold working rate. Furthermore, in the alloy with Nb content of 6 mol% and Ni/Ti atomic ratio being less than 1.05, the fracture stress and fracture strain reached about 1,000 MPa and over 20%, respectively. Based on the obtained results, several processing conditions such as the chemical composition, fabrication process and heat treatment are optimized for the Ti-Ni-Nb SMAs to develop SMA pipe joints.