利用金相显微镜（OM）、X射线衍射（XRD）、扫描电镜（SEM）和高温拉伸对时效态ZM61‐xSn（x＝0，6，8，10，质量分数／％，下同）合金的高温拉伸性能及断裂机制进行了研究。结果表明：ZM61‐xSn（x＝6，8，10）合金的物相由α‐Mg ，α‐Mn ，MgZn2，Mg2 Sn相组成。添加Sn元素可有效细化ZM61合金组织，提高合金高温强度，但降低合金塑性。ZM61‐xSn（x＝6，8，10）合金在300℃下拉伸的抗拉强度分别为149，140，145MPa ，较相同温度下拉伸的ZM61合金的抗拉强度分别提高了26％，17％，23％。ZM61‐xSn（x＝0，6，8，10）合金在300℃下拉伸的伸长率分别为39．95％，5．65％，7．01％和6．33％。拉伸温度对ZM61‐xSn（x＝6，8，10）合金的断裂机制产生显著影响。当拉伸温度低于220℃，合金为穿晶断裂；高于220℃时，合金变为沿晶断裂。
The elevated temperature mechanical properties and fracture mechanisms of as‐aged ZM61‐xSn(x=0 ,6 ,8 ,10 ,mass fraction/% )alloys are investigated by optical microscope (OM ) ,X‐ray dif‐fraction(XRD) ,scanning electron microscope (SEM ) and high temperature tensile test .The results show that the phase compositions of ZM61‐xSn(x=6 ,8 ,10)alloys areα‐Mg ,α‐Mn ,MgZn2 and Mg2Sn phases .The Sn element can refine the microstructure ,improve the high temperature tensile strength , but deteriorate the elongation of ZM61 alloy .The ultimate tensile strength of ZM61‐xSn(x=6 ,8 ,10) alloys with tensile test at 300℃are 149 ,140 ,145MPa ,compared with ZM61 alloy which is carried out tensile test at the same temperature ,the tensile strength increased 26% ,17% and 23% ,respectively . The elongation of ZM61‐xSn(x= 0 ,6 ,8 ,10)alloys with tensile test at 300℃ are 39 .95% ,5 .65% , 7 .01% and 6 .33% .The tensile temperature exerts dominating effect for ZM 61‐xSn(x=6 ,8 ,10)al‐loys on the fracture mechanism .As tensile temperature lower than 220℃ ,the alloys show transgran‐ular fracture characteristics .The alloys show intergranular fracture characteristics when the tensile temperature is higher than 220℃ .
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