Probing into the Yield Plateau Phenomenon in Commercially Pure Titanium During Tensile Tests

作     者：Xiaohui Shi Zuhan Cao Zhiyuan Fan Ruipeng Guo Junwei Qiao Xiaohui Shi;Zuhan Cao;Zhiyuan Fan;Ruipeng Guo;Junwei Qiao

作者机构：College of Materials Science and EngineeringTaiyuan University of TechnologyTaiyuan030024China 

出 版 物：《Acta Metallurgica Sinica(English Letters)》 (金属学报（英文版）)

年 卷 期：2021年第34卷第5期

页      面：701-709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：financial support from the National Natural Science Foundation of China(Grant No.51801132) the China scholarship council(CSC NO.201906935013)for X.H.Shi.Specially 

主　　题：Yield plateau Commercially pure titanium Tensile test Grain size Dislocation 

摘      要：To explain the intrinsic mechanism of the yield plateau phenomenon in commercially pure titanium,the tensile behaviors of commercially pure titanium specimens after 91.6%cryorolling and subsequent annealing at 280℃,335℃,450℃and 600℃have been *** results show that the yield plateau phenomenon is a result of dislocation behaviors controlled by grain size and thus only exists within a given range of mean grain size.αgrain boundaries are the main dislocation multiplication sources of commercially pure ***-grained microstructure could offer numerous dislocation multiplication locations during *** the applied stress is above the yielding strength,dislocations multiply rapidly and the mobile dislocation density is *** retrieve the imposed strain rate,the mean dislocation velocity is bound to be ***,it takes time for them to interact with each *** a result,the movement of dislocations is hardly blocked and the deformation could continue at a nearly constant applied ***,the so-called yield plateau behavior presents in the tensile *** disappearance of yield plateau phenomenon in coarse-grained and ultrafi ne-grained microstructures is attributed to the quick realization of the mutual interactions among dislocations at the initial stage of tensile test.