Microstructure and Properties of Mg-9Al-1Mn Alloy Sheets Processed by Hot Rolling
MA Shida1, TANG Aitao1,2, PENG Peng1, ZHANG Gen1, SHE Jia1,2, HUANG Guangsheng1,2, PAN Fusheng1,2
1 College of Materials Science and Engineering, Chongqing University, Chongqing 400045; 2 National Engineering Research Center for Magnesium Alloys, Chongqing University,Chongqing 400044
Abstract: In this paper, the microstructure and mechanical properties of Mg-9Al-1Mn (AM91) alloy sheets, which processed by hot extrusion in 3 mm followed by single pass large strain hot rolling (LSR) and multi pass small strain hot rolling (SSR) were investigated. And the microstructure and properties of the sheets were examined by X-ray diffraction (XRD), optical microscope, electron back scatter diffraction (EBSD) and tensile test, respectively. The results showed that, compared with the SSR method, the finer grains and more weaken texture could be achieved via using the LSR method in the as-extruded AM91 alloy. Moreover, compared with the SSR sheet, the yield strength (YS), ultimate tensile strength (UTS) and fracture elongation (FE) of LSR AM91 sheet were 193 MPa, 284 MPa and 20.5%, respectively. The plastic deformation capacity had been significantly improved. The mechanical anisotropy of the as-extruded sheet can be improved obviously by LSR method. The In-plane Anisotropy (IPA) of SSR and LSR AM91 sheet after annealing were 5% and 8.8%, respectively.
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2018, Vol. 32 
