The effects of wide range of compositional changes on the martensitic transformation characteristics of NiTiHf shape memory alloys
The effects of wide range of compositional changes on the martensitic transformation characteristics of NiTiHf shape memory alloys
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DOI：
10.1016/j.scriptamat.2018.10.008
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发表时间：
2019-03
影响因子：
6
通讯作者：
T. Umale;D. Salas;B. Tomes;R. Arróyave;I. Karaman
中科院分区：
文献类型：
--
作者：
T. Umale;D. Salas;B. Tomes;R. Arróyave;I. Karaman
系统探讨了成分对NiTiHf形状记忆合金马氏体相变特性的影响。转变温度 (TT) 表现出对 Ni 和 Hf 浓度的非单调依赖性。对于 Ni>50at%，TT 会随着少量 Hf 添加而降低，达到最小值或完全被抑制，具体取决于 Ni 含量，然后随着 Hf 含量的增加而显着增加。随着 Ni 含量的增加，TT 的初始下降变得更加明显，这归因于镍反位缺陷的增加以及大体积取代 Hf 导致局部晶格畸变的增加以及 Ti 和 Hf 的重新分布。
The effects of composition on the martensitic transformation characteristics of NiTiHf shape memory alloys are systematically explored. Transformation temperatures (TTs) demonstrate a non-monotonic dependence on Ni and Hf concentrations. For Ni > 50 at%, TTs decrease with small Hf additions, attain a minimum or are completely suppressed, depending on Ni content, followed by a significant increase with Hf content. This initial drop in TTs becomes more pronounced with higher Ni contents and is attributed to the increase in nickel anti-site defects along with bulky substitutional Hf contributing to the increase in local lattice distortions along with the re-distribution of Ti and Hf.