NiTi形状记忆合金激光增材制造研究进展

Research Progress on the Laser Additive Manufacturing Technology of NiTi Shape Memory Alloys

摘要:

NiTi形状记忆合金卓越的功能特性，生物相容性，高阻尼及低刚度，耐腐蚀等性能，深受广泛关注。NiTi形状记忆合金制备、加工困难，成为阻碍NiTi形状记忆合金应用的关键。近20年发展起来的增材制造技术，能直接成形制造复杂的NiTi形状记忆合金结构，在航空航天、医疗设备等领域具有巨大应用价值和发展前景。本文结合国内外NiTi形状记忆合金激光增材制造研究中面临的主要问题和解决方法作综合评述。具体包括NiTi形状记忆合金传统制造和激光增材制造对比；激光能量输入和热处理工艺对激光增材制造NiTi形状记忆合金微观组织、机械力学性能和功能特性的影响；及展望未来激光增材制造NiTi形状记忆合金研究方向。

Abstract:

NiTi shape memory alloys have received extensive attention due to their excellent functional properties, biocompatibility, damping properties, low stiffness, and corrosion resistance. However, the processability and machinability of NiTi shape memory alloys are of great difficulties. In the past 20 years, the additive manufacturing technology has been developed sharply, resulting in the direct fabrication for complex structure of NiTi shape memory alloys, which has a great potential value in the aerospace, medical equipment and other fields. This paper makes a comprehensive review of the key issues and solutions in the domestic and foreign NiTi shape memory alloys laser additive manufacturing researches, including comparison the traditional process manufacturing and additive manufacturing of NiTi shape memory alloys. Effect of laser additive manufacturing process parameters and post-heat treatment parameters on the microstructure, the mechanical properties and the functional properties of NiTi shape memory alloys. Based on research results, it is predicted that the future direction of NiTi shape memory alloys laser additive manufacturing.