Effect of Ti on the Structure and Mechanical Properties of Ti x Zr2.5- xTa Alloys

Bin Zhang; Yu Tang; Shun Li; Yicong Ye; Li'an Zhu; Zhouran Zhang; Xiyue Liu; Zhen Wang; Shuxin Bai

doi:10.3390/e23121632

Effect of Ti on the Structure and Mechanical Properties of Ti _x Zr_{2.5- x}Ta Alloys

Entropy (Basel). 2021 Dec 4;23(12):1632. doi: 10.3390/e23121632.

Authors

Bin Zhang¹, Yu Tang¹, Shun Li¹, Yicong Ye¹, Li'an Zhu¹, Zhouran Zhang¹, Xiyue Liu¹, Zhen Wang¹, Shuxin Bai¹

Affiliation

¹ Department of Materials Science and Engineering, College of Aerospace Science and Engineering, National University of Defense Technology, Changsha 410073, China.

Abstract

To determine the effects of Ti and mixing entropy (ΔS_mix) on the structure and mechanical proper-ties of Zr-Ta alloys and then find a new potential energetic structural material with good me-chanical properties and more reactive elements, Ti_xZr_2.5-xTa (x = 0, 0.5, 1.0, 1.5, 2.0) alloys were investigated. The XRD experimental results showed that the phase transformation of Ti_xZr_2.5-xTa nonequal-ratio ternary alloys depended not on the value of ΔS_mix, but on the amount of Ti atoms. With the addition of Ti, the content of the HCP phase decreased gradually. SEM analyses revealed that dendrite morphology and component segregation increasingly developed and then weakened gradually. When x increases to 2.0, Ti_xZr_2.5-xTa with the best mechanical properties can be ob-tained. The yield strength, compressive strength and fracture strain of Ti_2.0Zr_0.5Ta reached 883 MPa, 1568 MPa and 34.58%, respectively. The dependence of the phase transformation and me-chanical properties confirms that improving the properties of Zr-Ta alloys by doping Ti is feasible.

Keywords: Ti-Zr-Ta alloys; lattice structure; mechanical properties; mixing entropy; morphology.