Orientation Dependence of the Deformation Microstructure of Ta-4%W after Cold-Rolling

38th Risø International Symposium on Materials Science

Zhang, J.^1 ; Ma, G.Q.^1 ; Godfrey, A.^2 ; Shu, D.Y.^3 ; Chen, Q.^3 ; Wu, G.L.^1

College of Materials Science and Engineering, Chongqing University, Chongqing

400045, China^1

Key Laboratory of Advanced Materials (MoE), School of Materials Science and Engineering, Tsinghua University, Tsinghua

100084, China^2

Southwest Technology and Engineering Research Institute, Chongqing

400039, China^3

关键词: Body-centered cubic crystals;    Deformation microstructure;    Dislocation boundaries;    Electron backscattering diffraction;    Face-centered cubic metals;    Geometrically necessary dislocations;    Orientation dependence;    Stacking fault energies;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/219/1/012051/pdf
DOI  :  10.1088/1757-899X/219/1/012051

来源: IOP

【 摘 要 】

One of the common features of deformed face-centered cubic metals with medium to high stacking fault energy is the formation of geometrically necessary dislocation boundaries. The dislocation boundary arrangements in refractory metals with body-centered cubic crystal structure are, however, less well known. To address this issue a Ta-4%W alloy was cold rolled up to 70% in thickness in the present work. The resulting deformation microstructures were characterized by electron back-scattering diffraction and the dislocation boundary arrangements in each grain were revealed using sample-frame misorientation axis maps calculated using an in-house code. The maps were used to analyze the slip pattern of individual grains after rolling, revealing an orientation dependence of the slip pattern.