Abstract NiTi alloys have recently attracted significant attention in aerospace and biomedical applications due to their excellent properties such as high corrosion resistance, proper biocompatibility, superior mechanical properties, and particular functional features like their shape memory effect and superelasticity. Among different manufacturing processes, special attention has been paid to powder metallurgy (PM) techniques such as additive manufacturing (AM) methods due to their advantages. A summary of all PM methods and their pros and cons are provided. This paper provides a comprehensive review of effective parameters on the microstructure and final properties of NiTi manufactured parts through PM methods. The warm and cold green compactions are compared, whereas the effect of alloying elements on the properties is discussed. Besides, the results of employing different processing parameters such as sintering time, temperature, atmosphere, heating rate, building orientation, and energy density are reviewed. In the end, two novel functional structures are considered, and the corresponding studies are summarized. The main objective of this research is to wrap up the main and novel achievements of the recent works on the correlation between process parameters and properties of NiTi parts manufactured by PM processes to give the readers a better understanding of this issue.

中文翻译：

---

粉末冶金方法制造的 NiTi 基合金最终性能的有效参数：综述

摘要 NiTi合金由于其优异的性能，如高耐腐蚀性、适当的生物相容性、优异的机械性能以及形状记忆效应和超弹性等特殊功能特性，近年来在航空航天和生物医学应用中引起了广泛关注。在不同的制造工艺中，增材制造 (AM) 等粉末冶金 (PM) 技术因其优势而受到特别关注。提供了所有 PM 方法及其优缺点的摘要。本文通过 PM 方法全面回顾了 NiTi 制造零件的微观结构和最终性能的有效参数。比较了热压坯和冷压坯，同时讨论了合金元素对性能的影响。除了，回顾了采用不同工艺参数（如烧结时间、温度、气氛、加热速率、建筑方向和能量密度）的结果。最后，考虑了两种新的功能结构，并总结了相应的研究。本研究的主要目的是总结近年来关于PM工艺制造的NiTi零件的工艺参数与性能之间的相关性的主要和新颖的成果，以使读者更好地了解这一问题。