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SHS Processing of NiTi-Nb Smart Alloys

机译：NiTi-Nb智能合金的SHS处理

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摘要

Nb additions to NiTi smart alloys are known to lead to the PTT-hysteresis broadening and transformation temperatures raising - required in numerous applications. As Nb has a high affinity for oxygen, NiTi-Nb alloys processing by powder metallurgy, via SHS, from elemental NiTi-Nb powder mixtures, seems to be more advantageous and cost-effective than by classical one. However, its application encounters difficulties determined by the NiTi higher Gibbs Free Energy of Formation than of Ni_3Ti and NiTi_2, possible Ni-Nb compounds formation, Nb acting as diluent in SHS. This research proved the possibility to overcome these difficulties and of NiTi-Nb alloys obtaining by SHS using energetically activated powder mixture by controlled Mechanical Alloying. Also, it was proved the possibility to reduce Nb content from the common one of 9 at.% to 5 at.% without a significant effect of transformation temperatures and hysteresis decreasing.
机译：已知向NiTi智能合金中添加Nb会导致PTT滞后变宽和相变温度升高，这在许多应用中都是必需的。由于Nb对氧具有很高的亲和力，因此通过粉末冶金通过SHS从元素NiTi-Nb粉末混合物中加工NiTi-Nb合金似乎比传统方法更具优势和成本效益。然而，其应用遇到的困难在于，NiTi的形成吉布斯自由能比Ni_3Ti和NiTi_2更高，可能形成Ni-Nb化合物，Nb在SHS中充当稀释剂。这项研究证明了克服这些困难的可能性，以及通过机械控制合金化通过能量活化粉末混合物通过SHS获得的NiTi-Nb合金。同样，已经证明可以将Nb含量从9 at。％的普通含量降低到5 at。％，而对转变温度和磁滞的降低没有显着影响。

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