Physical and Mechanical Characterization of Ti50Ni(50−X)FeX Shape Memory Alloy Fabricated by Spark Plasma Sintering Process

Metallurgical and Materials Transactions A Pub Date : 2024-09-10 DOI:10.1007/s11661-024-07562-x

Jagadish Parida, Subash Chandra Mishra, Deepak Kumar Satapathy, Kishore Kumar Behera, Ajit Behera

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Abstract

NiTi smart alloys are known for their characteristic shape memory behavior. The current work focuses on the physical and mechanical characterization of Ni_(50−X)Ti₅₀Fe_X shape memory alloys prepared by the spark plasma sintering (SPS) process and their dependence on the concentration of Fe. The physical characterization of the samples confirmed the presence of the FeNiTi phase along with the Ti- and Ni-rich phases. Enhanced mechanical properties were observed in 8 at. pct Fe samples, which contained secondary intermetallic phases such as Ti₂Ni, Ni₃Ti, Fe₂Ti, and Ni₄Ti₃. Higher fraction of NiTi phase in the 8 at. pct Fe sample resulted in better shape memory properties while showing a higher friction coefficient. Ball on disk wear tests were done to identify the mechanisms contributing to the wear in the sintered sample. It is observed that the abrasive wear as well as the adhesive wear are the most prominent contributors for the surface material removal, and the dependence of characterization is observed with the variation of Fe content in NiTiFe alloy.

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利用火花等离子烧结工艺制造的 Ti50Ni(50-X)FeX 形状记忆合金的物理和机械特性分析

镍钛智能合金以其特有的形状记忆行为而闻名。目前的研究重点是火花等离子烧结（SPS）工艺制备的 Ni(50-X)Ti50FeX 形状记忆合金的物理和机械特性及其与铁浓度的关系。样品的物理表征证实了铁镍钛相以及富钛和富镍相的存在。在 8 at. pct Fe 样品中观察到了增强的机械性能，这些样品含有二级金属间相，如 Ti2Ni、Ni3Ti、Fe2Ti 和 Ni4Ti3。8 % pct Fe 样品中 NiTi 相的比例越高，形状记忆性能越好，同时摩擦系数也越高。为了确定烧结样品的磨损机制，我们进行了球盘磨损测试。结果表明，磨料磨损和粘着磨损是造成表面材料脱落的最主要原因，而且表征还与镍钛铁合金中铁含量的变化有关。

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Metallurgical and Materials Transactions A

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