Sn对AZ61镁合金微观组织与力学性能的影响

Effects of Sn on Microstructure and Mechanical Properties of AZ61 Magnesium Alloy

研究了Sn对AZ61镁合金显微组织和力学性能的影响。对显微组织的观察表明,当加入Sn之后,在铸态和热处理态合金中均发现了球形颗粒状的Mg2Sn。对合金力学性能的试验表明,少量的Sn可提高合金的抗拉强度和屈服强度。热处理态下,当Sn含量达到3%时合金的抗拉强度和屈服强度分别达到了274MPa和172MPa,但是伸长率下降到9%。拉伸断口的SEM形貌分析表明,加入Sn以后,合金断裂方式由解理断裂向准解理断裂转变。

Effects of Sn on microstructure and mechanical properties of AZ61 magnesium alloy have been in-vestigated. Microstructural observation indicates that the spheroidal Mg2Sn particle is created in both as-cast and heat treated AZ61 alloy with Sn addition. A few Sn addition can increase the tensile strength and yield strength of the alloy. With 3% Sn addition, the tensile strength and yield strength of heat-treated AZ61 alloy can reach 274 MPa and 172 MPa, respectively, while elongation is decreased to 9%. With Sn addition, fracture morphology is transformed from cleavage rupture into quasi-cleavage rupture from SEM observation.