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采用差热分析(DSC)、电导率和拉伸性能测试并结合光学显微镜(OM)、X射线衍射(XRD)、扫描电镜(SEM)、透射电镜(TEM)及能谱分析(EDS)等分析手段,研究了低频电磁铸造5083(Er)铝合金的过烧行为和不同均匀化温度下的组织和力学性能。结果表明:随均匀化温度的升高,合金的抗拉强度逐渐升高在510℃达最大值而后略有降低;电导率在490℃升至最高,在490～520℃间保持不变,在540℃急剧降低。通过组织观察、DSC实验和电导率测试综合确定合金的过烧温度为540℃。在470℃均匀化时,在组织中观察到大量100～700μm的MnAl6/FeMnAl6板条;在490℃均匀化时,开始有5～20nm的ErAl3相颗粒析出,位错是它们析出的择优地点;510℃均匀化时,MnAl6/FeMnAl6和ErAl3相最多;温度继续升高,这些相发生粗化而数量减少。
The samples were characterized by differential scanning calorimetry (DSC), conductivity and tensile properties combined with OM, XRD, SEM, EDS and EDS Means the over-burning behavior and microstructure and mechanical properties of low frequency electromagnetic casting 5083 (Er) aluminum alloy under different homogenization temperatures were studied. The results show that as the homogenization temperature increases, the tensile strength of the alloy increases gradually to reach the maximum at 510 ℃ and then decreases slightly. The conductivity rises to the highest at 490 ℃ and remains unchanged at 490 ~ 520 ℃. 540 ℃ sharp decline. The microstructure of the alloy was confirmed by DSC, DSC and conductivity test. The over-burning temperature was 540 ℃. When homogenized at 470 ℃, a large number of MnAl6 / FeMnAl6 laths of 100-700μm were observed in the microstructure. At 490 ℃, 5 ~ 20nm ErAl3 particles began to precipitate and dislocations were the preferred sites for their precipitation. At 510 ℃ homogenization, the contents of MnAl6 / FeMnAl6 and ErAl3 were the most, while the temperature continued to increase, the coarsening of these phases decreased.