文献类型：期刊文献

英文题名：Understanding deformation and fracture mechanism of Ti-55531 alloy under complex loading conditions: a case of pre-tensioned torsion

作者：Hu, Kong-Liang Huang, Chao-Wen Zeng, Hong-Tao Yang, Jiang Liu, Dan Li, Tian-Xin Wan, Ming-Pan Zhao, Yong-Qing

第一作者：Hu, Kong-Liang

通信作者：Huang, CW[1];Huang, CW[2];Zeng, HT[3];Zhao, YQ[4]

机构：[1]Guizhou Univ, Natl & Local Joint Engn Lab High Performance Met S, Guiyang 550025, Peoples R China;[2]Guizhou Univ, Key Lab Mat Struct & Strength Guizhou Prov, Guiyang 550025, Peoples R China;[3]Hebei Univ Engn, Coll Mech & Equipment Engn, Handan 056038, Peoples R China;[4]Guizhou Inst Technol, Sch Mat & Energy Engn, Guiyang 550003, Peoples R China;[5]Northwest Inst Nonferrous Met Res, Xian 710016, 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, Natl & Local Joint Engn Lab High Performance Met S, Guiyang 550025, Peoples R China;corresponding author), Guizhou Univ, Key Lab Mat Struct & Strength Guizhou Prov, Guiyang 550025, Peoples R China;corresponding author), Hebei Univ Engn, Coll Mech & Equipment Engn, Handan 056038, Peoples R China;corresponding author), Northwest Inst Nonferrous Met Res, Xian 710016, Peoples R China.

年份：2024

外文期刊名：RARE METALS

收录：;EI(收录号：20242916727922);Scopus(收录号：2-s2.0-85198841315);WOS:【SCI-EXPANDED(收录号:WOS:001271797400007)】；

基金：This work was financially supported by the National Natural Science Foundation of China (Nos. 52061005 and 52261025), the Science and Technology Program of Guizhou Province (Nos. YQK[2023]009 and [2023]278). We also thank Dr. Xuehao Zheng from ZKKF (Beijing) Science & Technology Company for supporting of TEM analysis and Jinhua Dai from Northwestern Polytechnical University for supporting of EBSD analysis.

语种：英文

外文关键词：Metastable beta titanium alloy; Pre-tension strain; Tension and torsion composite loads; Deformation behavior; Fracture mechanism

摘要：The deformation and fracture failure of aerospace structural components are primarily affected by complex loading conditions. This study aims to investigate how various pre-tension strains (0%, 4% and 6%) influence the torsional properties, deformation and fracture mechanism of the Ti-5Al-5Mo-5V-3Cr-1Zr (Ti-55531) alloy with the bimodal microstructure. The results indicate that increasing the pre-tension strain gradually decreases the torsional strength of specimens. However, their torsional ductility initially increases (from 0 to 4% pre-tension strain) and then decreases (from 4 to 6% pre-tension strain). This can be attributed to the significant influence of different pre-tension strains on the deformation mechanism of each phase in the alloy. Under pure torsion loading, the primary alpha (alpha(p)) phase mainly undergoes the {0002} basal slip for deformation. However, at a pre-tension strain of 4%, the torsional deformation mechanism of alpha(p) transforms into crossing reaction between the {10 (1) over bar0} prismatic slips. As the pre-tension strain further increases to 6%, {10 (1) over bar1} pyramidal slips were further activated. Moreover, with an increase in pre-tension strain, there is a significant rise multiple slips probability within the ap during torsional deformation. On contrary, for the secondary a (as) phase, the probability of {10 (1) over bar1}(alpha) twins formation during torsional deformation firstly rises and then reduces. These findings indicate that alpha phase, particularly alpha(p), plays a crucial role in accommodating deformation. This discovery offers valuable insights for further adjustments and optimizations of material microstructure and properties. Additionally, modifying external load can alter the stress state of components and enhance their fracture resistance during service, thereby broadening their range of applications and improving material reliability.