文献类型：期刊文献

英文题名：Gradient microstructure-mediated superior torsional properties in a metastable β Ti-55531 alloy

作者：Zhao, Yanyan Huang, Chaowen Yang, Jiang Li, Tianxin Liu, Dan Chen, Junyu Wan, Mingpan Ran, Xing

第一作者：Zhao, Yanyan

通信作者：Huang, CW[1]

机构：[1]Guizhou Univ, Natl & Local Joint Engn Lab High Performance Met S, Guiyang 550025, Peoples R China;[2]Nanyang Technol Univ, Sch Mech & Aerosp Engn, Nanyang 639798, Singapore;[3]Guizhou Inst Technol, Sch Mat & Energy Engn, Guiyang 550003, Peoples R China;[4]AVIC Heavy Machinery Co Ltd, Guiyang 550005, Peoples R China

第一机构：Guizhou Univ, Natl & Local Joint Engn Lab High Performance Met S, Guiyang 550025, Peoples R China

通信机构：corresponding author), Guizhou Univ, Guiyang 550025, Peoples R China.

年份：2025

卷号：1042

外文期刊名：JOURNAL OF ALLOYS AND COMPOUNDS

收录：;EI(收录号：20253919227646);Scopus(收录号：2-s2.0-105016788065);WOS:【SCI-EXPANDED(收录号:WOS:001585752200001)】；

基金：This work was supported by the National Natural Science Foundation of China (Nos. 52261025 and 52474402), the Science and Technology Programs of Guizhou Province (Nos. Talents Associated with Qiankehe Platform YQK[2023]009 and CXTD[2023]009). The SEM technical support from Shaanxi Qingyan Youce Technology Co., Ltd is acknowledged.

语种：英文

外文关键词：Ti-55531 alloy; High-frequency electromagnetic induction quenching; Gradient microstructure; Torsion properties; Deformation mechanism

摘要：This study explores a gradient microstructure design strategy for Ti-5Al-5Mo-5V-3Cr-1Zr (Ti-55531) alloy, utilizing high-frequency electromagnetic induction quenching (HFEIQ) to establish a surface-to-core microstructural gradient that optimizes torsional properties. Through synergistic integration of HFEIQ and aging treatments, we fabricated a hierarchical gradient microstructure characterized by nanoscale secondary alpha (alpha(s)) lamellae at the surface to enhance strength, while retaining semi-equiaxed primary alpha (alpha(p)) phases in the core to preserve ductility. The optimized gradient structure achieved remarkable mechanical improvements, with the HFEIQ-5.6 s specimen demonstrating a maximum shear stress (tau(max)) of 1158.08 MPa-representing an 8.75 % enhancement over conventional bimodal microstructures-while retaining 9.63 % shear ductility, thereby achieving an exceptional strength-ductility balance. Microstructural analysis reveals that the gradient structure promotes dislocation accumulation at alpha(s)/beta(r) (retained beta matrix) interfaces and deformation twinning within alpha(s) lamellae, enabling coordinated plastic deformation. These mechanisms, tailored by the gradient design, are critical for the enhanced properties. However, prolonged HFEIQ time (5.7 s) results in the coarsening of alpha(s) lamellae, which alleviates stress concentration and consequently reduces twin formation, thereby diminishing the strengthening effect. This work demonstrates that precisely controlled gradient microstructures can optimize the mechanical response of Ti-55531 alloy, offering a promising pathway for advanced structural applications.