Effect of Fe Addition on Microstructure and Mechanical Properties of As-cast Ti49Ni51 Alloy

Peiyou Li; Yuefei Jia; Yongshan Wang; Qing Li; Fanying Meng; Zhirong He

doi:10.3390/ma12193114

Effect of Fe Addition on Microstructure and Mechanical Properties of As-cast Ti₄₉Ni₅₁ Alloy

Materials (Basel). 2019 Sep 24;12(19):3114. doi: 10.3390/ma12193114.

Authors

Peiyou Li¹, Yuefei Jia², Yongshan Wang³, Qing Li⁴, Fanying Meng⁵, Zhirong He⁶

Affiliations

¹ School of Materials Science and Engineering, Shaanxi University of Technology, Hanzhong 723001, China. lipeiyou@snut.edu.cn.
² School of Materials Science and Engineering, Shanghai University, Shanghai 200444, China. YuefeiJia@shu.edu.cn.
³ School of Materials Science and Engineering, Shaanxi University of Technology, Hanzhong 723001, China. hanwangyongshan@163.com.
⁴ School of Materials Science and Engineering, Shaanxi University of Technology, Hanzhong 723001, China. liqing20190208@163.com.
⁵ School of Materials Science and Engineering, Shaanxi University of Technology, Hanzhong 723001, China. aboying@yahoo.com.
⁶ School of Materials Science and Engineering, Shaanxi University of Technology, Hanzhong 723001, China. hezhirong01@163.com.

Abstract

Effect of Fe addition on microstructure and mechanical properties of as-cast Ti₄₉Ni₅₁ alloy were investigated. The experimental results shows the microstructures of Ti_48.5Ni₅₁Fe_0.5 and Ti₄₈Ni₅₁Fe₁ alloys are mainly composed of TiNi matrix phase (body-centered cubic, BCC), Ti₃Ni₄ and Ni_2.67Ti_1.33 phases; the microstructure of Ti₄₇Ni₅₁Fe₂ alloy is mainly composed of BCC TiNi, Ti₃Ni₄, Ni_2.67Ti_1.33, and Ni₃Ti phases; the microstructure of the Ti₄₅Ni₅₁Fe₄ alloy is mainly composed of TiNi, Ti₃Ni₄ and Ni₃Ti phases. The Ni₃Ti nanocrystalline precipitates at the adjacent position of Ni_2.67Ti_1.33 phase. The Ti_48.5Ni₅₁Fe_0.5 and Ti₄₈Ni₅₁Fe₁ alloys have high yield strength and fracture strength, and can be as the engineering materials with excellent mechanical properties. In addition, the Ti_48.5Ni₅₁Fe_0.5 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.

Keywords: Ti–Ni–Fe alloys; mechanical properties; microstructures; shape memory alloy.