Li Peiyou, Jia Yuefei, Wang Yongshan, Li Qing, Meng Fanying, He Zhirong
School of Materials Science and Engineering, Shaanxi University of Technology, Hanzhong 723001, China.
School of Materials Science and Engineering, Shanghai University, Shanghai 200444, China.
Materials (Basel). 2019 Sep 24;12(19):3114. doi: 10.3390/ma12193114.
Effect of Fe addition on microstructure and mechanical properties of as-cast TiNi alloy were investigated. The experimental results shows the microstructures of TiNiFe and TiNiFe alloys are mainly composed of TiNi matrix phase (body-centered cubic, BCC), TiNi and NiTi phases; the microstructure of TiNiFe alloy is mainly composed of BCC TiNi, TiNi, NiTi, and NiTi phases; the microstructure of the TiNiFe alloy is mainly composed of TiNi, TiNi and NiTi phases. The NiTi nanocrystalline precipitates at the adjacent position of NiTi phase. The TiNiFe and TiNiFe alloys have high yield strength and fracture strength, and can be as the engineering materials with excellent mechanical properties. In addition, the TiNiFe alloy with the low elastic modulus and large elastic energy is also a good biomedical alloy of hard tissue implants. The fracture mechanism of the four alloys is mainly cleavage fracture or quasi-cleavage fracture, supplemented by ductile fracture. The experimental data obtained provide the valuable references in application of as-cast alloys and heat-treated samples in the future.
研究了添加铁对铸态TiNi合金微观结构和力学性能的影响。实验结果表明，TiNiFe和TiNiFe合金的微观结构主要由TiNi基体相（体心立方，BCC）、TiNi和NiTi相组成；TiNiFe合金的微观结构主要由BCC TiNi、TiNi、NiTi和NiTi相组成；TiNiFe合金的微观结构主要由TiNi、TiNi和NiTi相组成。NiTi纳米晶体在NiTi相的相邻位置析出。TiNiFe和TiNiFe合金具有较高的屈服强度和断裂强度，可作为具有优异力学性能的工程材料。此外，具有低弹性模量和大弹性能的TiNiFe合金也是一种良好的硬组织植入生物医学合金。四种合金的断裂机制主要为解理断裂或准解理断裂，辅以韧性断裂。所获得的实验数据为铸态合金和热处理样品在未来的应用提供了有价值的参考。
