【摘要】 通过光学显微金相定量分析、SEM扫描电镜及EDX分析、XRD分析以及抗拉强度、显微硬度测试等实验手段,研究添加量0~10%(wt)Sn的铸态Mg-Sn二元合金的显微组织与力学性能。实验结果表明,显微硬度随Sn的增加而增加,Mg2Sn的第二相强化是主要原因。Sn≤5%(wt)时,合金的抗拉强度和伸长率随Sn的增加而增加,Sn的细晶强化起到了主要作用。Mg-10%Sn的抗拉强度、特别是伸长率降低,细晶强化作用消失和脆性的Mg2Sn颗粒数量增多是主要原因。更多还原

【Abstract】 The microstructure and mechanical properties of as-cast Mg-Sn binary alloys were studied by optical microscopy,scanning electron microscopy（SEM）,Energy Dispersive X-ray（EDX） Analysis,X-ray diffraction（XRD） quantitative and qualitative analysis,tensile strength and micro-hardness testing.The results showed that Mg-Sn binary alloy is composed of α-Mg matrix and Mg₂Sn.The mechanical tests indicated that the micro-hardness of the alloy increases when Sn content raises,the main reason of which was the dispersion strengthening of Mg₂Sn and the grain refinement strengthening of Sn.The tensile strength and elongation of the alloys grow with the increase of Sn content when the content of Sn≤5%（wt）.The grain refinement of Sn acts as the leading role in this content range of Sn.The tensile strength and especially elongation decline for Mg-10%Sn alloy,which owes mainly to the disappearance of grain refinement strengthening and the increase of brittle Mg₂Sn phase.更多还原