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Evolution of texture gradient and microstructure of high purity tantalum in clock-rolling process

MAO Yu-cheng;LIU Shi-feng;FAN Hai-Yang;LIU Qing;College of Materials Science and Engineering,Chongqing University;  
The samples of high-pure tantalum were obtained by controlling roll-passes with deformation at 70%,82% and 87% in the clock-rolling process. X-ray diffraction( XRD) technology was applied to measure the macro-texture of high-pure tantalum at the surface layer,a quarter of layer and the middle tier. At the same time,the electron back scattered diffraction( EBSD) technology was used to reveal the evolution of the deformation texture and microstructure along the thickness-direction. The results show that the degrees of orientation-divide in the { 111} 〈uvw〉and { 100} 〈uvw〉textures both increase with the accumulation of cross-rolling deformation,and the degree of orientation-divide in the { 111} 〈uvw〉texture is higher than that in the { 100} 〈uvw〉texture. When the rolling reduction reaches to 87%,the { 100} 〈uvw〉texture and { 111} 〈uvw〉texture at the surface and center layers are in strip shape and interactive distribution in each other,which can reduce the texture gradient of tantalum-plate along the thickness-direction and obtain the uniform grain size.
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