High-strength Ti-Al-V-Zr cast alloys designed using α and β cluster formulas

作     者：Zhi-hao Zhu Yu-han Liu Zhi-peng Chen Tian-yu Liu Shuang Zhang Dan-dan Dong Chuang Dong Zhi-hao Zhu;Yu-han Liu;Zhi-peng Chen;Tian-yu Liu;Shuang Zhang;Dan-dan Dong;Chuang Dong

作者机构：Key Laboratory for Materials Modification by LaserIonand Electron Beams and School of Materials Science and EngineeringDalian University of TechnologyDalian 116024LiaoningChina State Key Laboratory of Light Alloy Casting Technology for High-end EquipmentShenyang Research Institute of Foundry Co.Ltd.Shenyang 110022China School of Materials Science and EngineeringDalian Jiaotong UniversityDalian 116028LiaoningChina College of Physical Science and TechnologyDalian UniversityDalian 116622LiaoningChina 

出 版 物：《China Foundry》 (中国铸造（英文版）)

年 卷 期：2023年第20卷第1期

页      面：23-28页

核心收录：

学科分类：08[工学] 0806[工学-冶金工程] 0805[工学-材料科学与工程（可授工学、理学学位）] 080502[工学-材料学] 

基　　金：financially supported by the Key Discipline and Major Project of Dalian Science and Technology Innovation Foundation(Grant No.2020JJ25CY004) the National Basic Research Program of China(Grant No.2020JCJQZD165)。 

主　　题：titanium alloy cluster-plus-glue-atom model composition design microstructure mechanical properties 

摘      要：Ti-Al-V-Zr quaternary titanium alloys were designed followingα-{[Al-Ti12](AlTi2)}17-n+β-{[Al-Ti12Zr2](V3)}n,where n=1-7(the number ofβunits),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 theβ-Ti unit,based on the originalβformula[Al-Ti14](V2Ti)of Ti-6Al-4V alloy.The microstructures of the as-cast alloys by copper-mold suction-casting change from pureα(n=1)toα+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 acicularα’martensite.Its specific strength far exceeds that of Ti-6Al-4V alloy by 35%.