【摘要】 采用OM,XRD,SEM和EDS等分析手段,研究了不同含量的稀土元素钐(质量分数,0.0%,0.5%,1.0%,1.5%和2.0%)对AZ61镁合金组织与性能的影响。结果表明:在含钐为0.5%~2.0%的AZ61镁合金中发现了大量的颗粒状Al2Sm金属间化合物(体积分数为0.4%~2.2%),这些颗粒的直径为1~7μm。当合金中稀土元素钐的含量从0.0%增加到2.0%时,合金中Al2Sm颗粒尺寸逐渐增大,而β-Mg17Al12的含量却不断减小。经693 K固溶24 h的含钐AZ61镁合金的晶粒尺寸随着钐含量的增加而先减小后增加,当钐含量为1.0%时,合金的晶粒尺寸最小。固溶态AZ61镁合金中的钐含量达到1.0%时,合金的极限抗拉强度、屈服强度和延伸率都达到最大,分别为215、142 MPa和4.1%。更多还原

【Abstract】 The effect of samarium(Sm) adding(0.0 wt%, 0.5 wt%, 1.0 wt%, 1.5 wt% and 2.0 wt%) on microstructure and mechanical properties of AZ61 magnesium alloys was investigated by OM, XRD, SEM and EDS. The results indicate that volume fraction 0.4%~2.2% Al2 Sm particles with the average diameter of 1~7 μm are found in AZ61 magnesium alloys with different Sm contents addition. When Sm content increases from 0.0 wt% to 2.0 wt%, the particle size of Al2 Sm gradually increases while the content of β-Mg17Al12 decreases. Meanwhile the grain size of AZ61 magnesium alloys after solution treatment at 693 K for 24 h firstly decreases and then increases with Sm content increasing. When Sm content is 1.0 wt%, the grain size is least. The ultimate tensile strength, the yield stress and the elongation of AZ61 magnesium alloys with 1.0 wt% Sm after solution treatment are 215, 142 MPa, and 4.1%, respectively, up to their maximum values.更多还原