A new α plus β Ti-alloy with refined microstructures and enhanced mechanical properties in the as-cast state

SCRIPTA MATERIALIA

卷:207

Article

Zhang, Tianlong^1,2  Zhu, Jiaming¹  Yang, Tao¹  Luan, Junhua¹  Kong, Haojie¹  Liu, Weihong^1,3  Cao, Boxuan¹  Wu, Shiwei¹  Wang, Dong²  Wang, Yunzhi⁴  Liu, Chain-Tsuan¹ 

[1] City Univ Hong Kong, Coll Engn, Hong Kong Inst Adv Study, Dept Mat Sci & Engn,Kowloon Tong,Kowloon, Tat Chee Ave, Hong Kong, Peoples R China

[2] Xi An Jiao Tong Univ, Frontier Inst Sci & Technol, State Key Lab Mech Behav Mat, Xian 710049, Peoples R China

[3] Sch Mat Sci & Engn, Harbin Inst Technol Shenzhen, Shenzhen, Peoples R China

[4] Ohio State Univ, Dept Mat Sci & Engn, 2041 Coll Rd, Columbus, OH 43210 USA

关键词: Titanium alloys;    Mechanical property;    Grain refinement;    Thermodynamic calculation;    Alloy design;   

DOI  :  10.1016/j.scriptamat.2021.114260

来源: Elsevier

【 摘 要 】

A new (alpha + beta) Ti-alloy, Ti-6Al-2V-1Cr-1Fe (wt%), with fine grain sizes, fine precipitates, together with the high strength and excellent ductility in its as-cast state is developed. As compared to the as-cast commercial Ti-6Al-4V alloy, the grain size and alpha lath thickness of the new alloy are substantially refined by 50 similar to 75%, and the yield strength and ductility are increased by 19.7% and 51.8%, respectively. The grain size refinement is achieved by tuning the supercooling capacity of the alloy through alloying with the aid of CALPHAD calculations. In addition, the alloying of Cr and Fe substantially reduces the alpha lath thickness. This low-cost Ti alloy with the enhanced properties is anticipated to be highly suitable for various structural applications in its as-cast or as-printed state. (C) 2021 Published by Elsevier Ltd on behalf of Acta Materialia Inc.

【 授权许可】

Free