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Microstructures and mechanical properties of double hot-extruded AZ80+xSr wrought alloys 被引量:5
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作者 关绍康 朱世杰 +2 位作者 王利国 杨卿 曹文博 《中国有色金属学会会刊:英文版》 EI CSCD 2007年第6期1143-1151,共9页
The effects of Sr addition on microstructures and tensile properties of the as-cast and hot-extruded AZ80 alloys were studied by OM, SEM, EDS, XRD, DSC and Instron tester. The results show that the microstructures of ... The effects of Sr addition on microstructures and tensile properties of the as-cast and hot-extruded AZ80 alloys were studied by OM, SEM, EDS, XRD, DSC and Instron tester. The results show that the microstructures of as-cast alloys consist of α-Mg and β-Mg17Al12 phase. Sr gathers on the boundaries, and dissolves into β-Mg17Al12 phase or forms Mg17Sr2 phase. The grains of as-cast alloys are refined and discontinuous net-shaped structure is formed. The compound phases on the boundaries become thicker with increasing Sr content. The ultimate tensile stress(UTS) and elongation are improved compared with the corresponding Sr-free alloy. After preliminary hot-extruding, the UTS is up to 308?320 MPa and elongation reaches 8.0%?13.5%. After double hot-extrusion, the dynamic recrystallization completes totally, and the UTS is up to 310?355 MPa, but the elongation does not change apparently. The alloy with 0.02%Sr (mass fraction) obtains the best comprehensive performance with the UTS of 355 MPa and elongation of 13.2%. The SEM morphology of fracture surface shows that the alloys with Sr present good ductility after double hot-extrusion. 展开更多
关键词 镁合金 双倍热挤压 拉伸长度 微观结构 机械性质
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