期刊
MATERIALS RESEARCH EXPRESS
卷 6, 期 3, 页码 -出版社
IOP PUBLISHING LTD
DOI: 10.1088/2053-1591/aaf345
关键词
magnesium alloys; asymmetric rolling; microstructure; texture; mechanical properties
资金
- Babol Noshirvani University of Technology [BNUT/393044/97]
In this study, the effect of asymmetric cold rolling on microstructure, texture, and mechanical properties of AZ91 magnesium alloy investigated. Optical microscopy (OM), scanning electron microscopy (SEM), x-ray diffraction (XRD), tensile, and hardness tests performed. The homogenization process significantly increased the grain size of the as-cast sample. During 8% rolling, continuous dynamic recrystallization (CDRX) mechanism resulted in a relatively sharp drop in average grain size. The results indicated that the formation of extension twins during rolling led to a rotation of {0001}parallel to RD primary oriented grains toward {0001}parallel to ND texture. After 15% deformation, the created basal texture with the intensity of 4.6 mrd has almost 10-degree deviation from the normal direction. With increasing the rolling reduction, the hardness increased due to increasing the fraction of twins and intensity of basal texture. The 8% deformed sample had the maximum tensile strength and microhardness owing to the saturation of twins as well as the absence of microcracks in the microstructure. Findings showed that the as-homogenized and 8% rolled samples had the highest and lowest inhomogeneity factor (18.5 and 10.6), respectively. The failure mode was a mixture of cleavage and ductile fracture. With increasing the thickness reduction, the cleavage mode became severe due to the formation of microcracks.
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