Formation behavior of basal texture under the high temperature plane strain compression deformation in AZ80 magnesium alloy

17th International Conference on Textures of Materials

材料科学;物理学

Kim, K.^1 ; Okayasu, K.^2 ; Fukutomi, H.^2

Department of Metallurgical Engineering, Pukyong National University, Busan

608-739, Korea, Republic of^1

Department of Solid State Materials and Engineering, Yokohama National University, Yokohama

240-8501, Japan^2

关键词: AZ80 magnesium alloy;    Deformation conditions;    Electron back scatter diffraction;    High temperature deformation;    Plane strain compression;    Plane strain compression tests;    Schulz reflection method;    True stress;    true strain curves;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/82/1/012049/pdf
DOI  :  10.1088/1757-899X/82/1/012049

学科分类：材料科学（综合）

来源: IOP

【 摘 要 】

The formation behavior of basal texture during high temperature deformation of AZ80 magnesium alloys in single phase was investigated by plane strain compression deformation. Three kinds of specimens with different initial textures were machined out from an extruded bar having atexture. Plane strain compression tests were conducted at temperatures of 623K and 723K and a strain rate of 5.0×10-2s-1, with a strain range of between - 0.4 and -1.0. After deformation, the specimens were immediately quenched in oil. Texture measurement was carried out on the compression planes by the Schulz reflection method using nickel filtered Cu Kα radiation. Electron backscatter diffraction (EBSD) measurements were also conducted in order to examine the spatial distribution of orientations. Three kinds of specimens named A, B and C were prepared from the same extruded bar. In the specimens A, B and C, {0001} was distributed preferentially parallel to ND, TD, and RD, respectively. After deformation, texture evaluation was conducted on the mid-plane section. At the plane strain compression deformation, peaks appeared in the true stress-true strain curves irrespective of the kinds of specimen used. It was found that the main components and the pole densities of the textures vary depending on deformation condition and initial texture. Six kinds of texture components were observed after deformation. The (0001) has formed regardless of the initial texture. There are two types of texture components; one exists before the deformation, and the other does not. Either types are considered to have stable orientations for plane strain compression. Also, the basal texture is composed of two crystal orientation components - (0001) and (0001). When (0001) existed before deformation, an extremely sharp (0001) (compression plane) texture is formed.