Microstructure and Texture Evolution of AZ31 Magnesium Alloy Thin Sheet Processed by Hot?Rolling?Shearing?Bending

Laixin Shi; Li Hu; Huyuan Lv; Mingao Li; Tao Zhou; Mingbo Yang

doi:10.1007/s12540-021-01002-w

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자료유형: 학술저널

저자정보: Laixin Shi (Chongqing University of Technology) Li Hu (Chongqing University of Technology) Huyuan Lv (Chongqing University of Technology) Mingao Li (Chongqing University of Technology) Tao Zhou (Chongqing University of Technology) Mingbo Yang (Chongqing University of Technology)

저널정보: 대한금속·재료학회 Metals and Materials International Metals and Materials International Vol.28 No.5

발행연도: 2022.5

수록면: 1,224 - 1,231 (8page)

DOI: 10.1007/s12540-021-01002-w

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A novel and efficient deformation methodology, viz., hot-rolling?shearing?bending (HRSB), to introduce a large amount of{10?12} extension twins (ETs) and control the texture of the AZ31 magnesium alloy thin sheet was proposed. Microstructureand texture within various regions of the thin sheet fabricated by the HRSB method were investigated by means of electronback-scattered diffraction measurement. The experimental results indicated that using only single pass of HRSB, grains withc-axis//normal direction (ND) in as-received sheet are nearly twinned totally (about 91% volume fraction of {10?12} ET),leading to the formation of c-axis//rolling direction (RD) texture component and the disappearance of c-axis//ND texturecomponent. As for the HRS sample which has suffered from rolling?shearing deformation, both a tensile stress componentderiving from the shearing deformation and a compressive stress component resulting from the impediment effect of themould structure are beneficial to activate {10?12} ET, the volume fraction of which is about 72%. With respect to the HRSBsample which has undergone rolling?shearing?bending deformation, the further increase in volume fraction of {10?12} ETmight be mainly related to the resultant compressive stress of the tensile stress derived from the bending deformation andthe compressive stress resulting from the impediment effect of mould structure. It would hinder the activation of {10?12} ETwithin twinned areas and promote the migration of existing boundaries of {10?12} ET into un-twinned areas.

#AZ31 magnesium alloy · Hot-rolling?shearing?bending · Texture · Microstructure · Extension twin

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