【摘 要】
：
The microstructure,texture,residual stress,and tensile properties of Mg-6Zn-2Y-1La-0.5Zr (wt％) magnesium alloy were investigated before and after extrusion process,which performed at 300 ℃ and 400 ℃.The microstructural characterizations indicated that the
【机 构】
：
Department of Metallurgical and Materials Engineering, Karabuk University, Baliklarkayasi Mevkii Dem
论文部分内容阅读
The microstructure,texture,residual stress,and tensile properties of Mg-6Zn-2Y-1La-0.5Zr (wt％) magnesium alloy were investigated before and after extrusion process,which performed at 300 ℃ and 400 ℃.The microstructural characterizations indicated that the as-cast alloy was comprised of α-Mg,Mg-Zn,Mg-Zn-La,and Mg-Zn-Y phases.During homogenization at 400 ℃ for 24 h,most of the secondary phases exhibited partial dissolution.Extrusion process led to a remarkable grain refinement due to dynamic recrystallization (DRX).The degree of DRX and the DRXed grain size increased with increasing extrusion temperature.The homogenized alloy did not show a preferential crystallographic orientation,whereas the extruded alloys showed strong basal texture.The extrusion process led to a significant improvement on the compressive residual stress and mechanical properties.The alloy extruded at 300 ℃ exhibited the highest basal texture intensity,the compressive residual stress and hardness,and yield and tensile strengths among the studied alloys.
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