Microstructural strengthening and toughening mechanisms in Fe-containing Ti-6Al-4V:A comparison between homogenization and aging treated states

作     者：Yu Liao Junhua Bai Fuwen Chen Guanglong Xu Yuwen Cui Yu Liao;Junhua Bai;Fuwen Chen;Guanglong Xu;Yuwen Cui

作者机构：Tech Institute for Advanced Materials&College of Materials Science and EngineeringNanjing Tech UniversityNanjing 211816China 

出 版 物：《Journal of Materials Science & Technology》 (材料科学技术（英文版）)

年 卷 期：2022年第99卷第4期

页      面：114-126页

核心收录：

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

基　　金：sponsored by the National Natural Science Foundation of China(Grant No.51801101) the Natural Science Foundation of Jiangsu Province(Grant No.BE2019119) 

主　　题：Ti-6Al-4V Fe microalloying Homogenization Yield strength Fracture toughness Microstructural strengthening/toughening factors 

摘      要：Microalloying of Ti–6Al–4V alloy by Fe addition has attracted interest as a promising way to improve castability and comprehensive mechanical *** mission of this work is twofold by employing the experimental examination and the phenomenological analysis,(1)to investigate the effect of Fe addition on the microstructure features and mechanical properties of the Fe-containing Ti–6Al–4V(TC4-xF)alloys subjected to casting and homogenization treatment,and(2)to unveil the critical microstructure features in homogenization,hot-worked and aging treated alloys,respectively,that benefit the yield strength and the fracture *** observations evidence that the addition of 0.5 wt.%Fe is most effective in enhancing the tensile ductility and the modeⅠfracture *** Fe addition up to 0.7–0.9 wt.%results in plateau values of yield and ultimate strengths with some *** analyses screen out the microstructural strengthening and toughening determinants which exhibit distinct sensitivities on Fe content under different processing *** solid solution strengthening is confirmed as the primary effect that governs the yield strength of the homogenization treated TC4-xF alloys,followed by the refined size of colony andαlamella,so does it for the hot-worked and the aging-treated *** strengthening effect of Fe could be further promoted by hot-working but impaired by a prolonged annealing time or a lowered cooling *** type of crack propagation path and theαmorphology are discerned to play their own leading roles in different cases to influence the performance of fracture toughness.A long crack propagation distance that traverses broadα/βlamellae embraces a high crack propagation resistance and gives rise to enhanced fracture *** experimental results enrich the dataset of microstructure features and mechanical properties of Ti–6Al–4V relevant *** upon the phenomenological analysis,the discove