The relationship between slip behavior and dislocation arrangement for large-size Mo-3Nb single crystal at room temperature  

作　　者：Benqi Jiao Qinyang Zhao Yongqing Zhao Laiping Li Zhongwu Hu Xuanqiao Gao Wen Zhang Jianfeng Li 

机构地区：[1]School of Materials Science and Engineering,Northeastern University,Shenyang 110819,China [2]School of Material Science and Engineering,Chang'an University,Xi’an 710064,China [3]Northwest Institute for Nonferrous Metal Research,Xi’an 710016,China

出　　处：《Journal of Materials Science & Technology》2021年第33期208-213,共6页材料科学技术（英文版）

基　　金：financially supported by the Major Science and Technology Project of Shaanxi Province,China(No.2020zdzx04-02-02);the Key Research and Development Program of Shaanxi,China(Nos.2019ZDLGY05-04 and 2019ZDLGY05-06);the National key Research and Development Program(No.2017YFB0306003)。

摘　　要：The slip behavior and mechanism of large-size Mo-3Nb single crystal have been investigated and disclosed comprehensively at room temperature by quasi-static compression with various strains.With the increase of deformation,the slip traces change from shallow non-uniform slip lines to dense and uniform slip bands.Different slip traces in the same deformation condition were observed,suggesting that the slip traces in the single crystal are controlled by different types and arrangement mechanisms of mobile dislocation.To clarify the relationship between slip behavior and dislocation arrangement,TEM and AFM analyses were performed.Significant discrepancy between the mobility of screw segments and edge segments caused by double cross-slip multiplication mechanism is the reason why different slip features were witnessed.During the whole slip deformation process,screw dislocations play a dominant role and they are inclined to form wall-substructures by interaction and entanglement.With the development of dislocation accumulation,the entangled dislocation walls evolve into dislocation cells with higher stability.

关 键 词：Mo-3Nb single crystal Slip behavior DISLOCATION CROSS-SLIP Substructure evolution mechanism 

分 类 号：TG146.412[一般工业技术—材料科学与工程]