Mechanical properties and deformation mechanisms in microscale Ti-55531 alloy

State Key Laboratory for Mechanical Behavior of Materials, Xi’an Jiaotong University, Xi’an, Shaanxi 710049, P. R. China

^* Corresponding authors. E-mail address: qysun@mail.xjtu.edu.cn (Qiaoyan Sun), lxiao@mail.xjtu.edu.cn (Lin Xiao).

Abstract

The mechanical behaviors and deformation mechanisms of solution treated and 450°C aged Ti-55531 alloy microsamples are investigated by the micro-compression and micro-bending. The results show that the dislocation slip is a concentrated movement in the solution treated microsamples which containing nanoscale ω phase. Under the tensile and compressive stress, there were serious strain bursts occurred in the plastic deformation of solution treated microsamples. But the dislocation slip is transmit at the phase interface in the 450°C aged microsamples which containing high density of α phase. The deformation behavior exhibits high strength and excellent stability in the micro-compression and micro-bending process. The different mechanical behaviors and deformation mechanisms of Ti-55531 alloy containing different second phase have significant guidance for tailoring the microstructure and mechanical properties.

Key words: Titanium, Micro-compression, Micro-bending, Dislocation, Mechanical behavior