Mg-4Sn-1Ce合金的组织及热压缩行为

Microstructures and hot compression behavior of Mg-4Sn-1Ce alloy

摘要:

本文采用光学金相显微镜(OM)、X 射线衍射(XRD)、扫描电镜(SEM)以及热压缩实验对Mg-4Sn-1Ce合金的微观组织和热压缩行为进行了研究. 结果表明,铸态合金主要由“岛”状的α-Mg、Mg2Sn、Ce4Sn5和MgSnCe相组成. 合金在250~450 ℃和0.001~1 s-1应变速率下进行热压缩，热变形激活能Q为162.03 kJ/mol. 热压缩温度由250 ℃升高到450 ℃，合金显微组织由（扁平状晶粒+挤压流线）组织演变为再结晶等轴晶粒组织.

Abstract:

The microstructures and hot compression behavior of Mg-4Sn-1Ce alloy were studied by optical microscopy (OM), X-ray diffraction (XRD), scanning electron microscopy (SEM) and hot simulation test. The results shown that the as-cast alloy is mainly composed of island-like “island” shaped α-Mg、Mg2Sn、Ce4Sn5 and MgSnCe phases with the strain rate range of 0.001~1 s-1 and temperature range of 250~450 ℃ hot compression. The hot deformation activation energy Q is 162.03 kJ/mol. When the hot compression temperature increases from 250 to 450 ℃, the microstructures of tested alloy evolve from (compressed grains+extruded streamlines) to recrystallized equiaxed grains.