《China Foundry》
Title:High-strength Ti-Al-V-Zr cast alloys designed using α and β cluster formulas
Author:Zhi-hao Zhu1, Yu-han Liu1, Zhi-peng Chen1, Tian-yu Liu2, Shuang Zhang3, *Dan-dan Dong4, and Chuang Dong1, 3
Address: 1. Key Laboratory for Materials Modification by Laser, Ion, and Electron Beams and School of Materials Science and Engineering, Dalian University of Technology, Dalian 116024, Liaoning, China 2. State Key Laboratory of Light Alloy Casting Technology for High-end Equipment, Shenyang Research Institute of Foundry Co., Ltd., Shenyang 110022, China 3. School of Materials Science and Engineering, Dalian Jiaotong University, Dalian 116028, Liaoning, China 4. College of Physical Science and Technology, Dalian University, Dalian 116622, Liaoning, China
Key words:titanium alloy; cluster-plus-glue-atom model; composition design; microstructure; mechanical properties
CLC Nmuber:TG146.23
Document Code:A
Article ID:1672-6421(2023)01-023-06
Abstract:
Ti-Al-V-Zr quaternary titanium alloys were designed following α-{[Al-Ti12](AlTi2)}17-n+β-{[Al-Ti12Zr2](V3)}n, where n=1-7 (the number of β units), on the basis of the dual-cluster formula of popular Ti-6Al-4V alloy. Such an alloying strategy aims at strengthening the alloy via Zr and V co-alloying in the β-Ti unit, based on the original β formula [Al-Ti14](V2Ti) of Ti-6Al-4V alloy. The microstructures of the as-cast alloys by copper-mold suction-casting change from pure α (n=1) to α+α' martensite (n=7). When n is 6, Ti-5.6Al-6.8V-8.1Zr alloy reaches the highest ultimate tensile strength of 1,293 MPa and yield strength of 1,097 MPa, at the expense of a low elongation of 2%, mainly due to the presence of a large amount of acicular α' martensite. Its specific strength far exceeds that of Ti-6Al-4V alloy by 35%.