热处理工艺对Mg-6Zn-2Sm-0.4Zr镁合金显微组织和力学性能的影响
发布时间：2019-03-19 09:57
【摘要】：通过在Mg-6Zn合金中添加0.4%Zr和2%Sm(质量分数)制备出一种新型Mg-6Zn-2Sm-0.4Zr合金;利用光学显微镜(OM)、扫描电镜(SEM)及能谱仪(EDS)、X射线衍射仪(XRD)、显微硬度及力学性能测试研究铸造Mg-6Zn-2Sm-0.4Zr合金在铸态、固溶、时效处理下的显微组织和力学性能的变化。结果表明:合金铸态组织主要由基体α-Mg、晶界处呈连续或半连续分布的(α-Mg+Mg_2Zn_3+Mg_(41)Sm_5)共晶和晶内孤立的点状相组成。合金在440和450℃固溶12~36 h时间范围内,随着时间和温度的增加,固溶效果逐渐增强。当在450℃固溶28 h时获得了较好的显微组织,抗拉强度为230 MPa,伸长率为9.58%。随后经200℃时效6~48 h后,合金的力学性能明显提高,时效强化效应随时间的延长呈先增加后减小的趋势,其中时效12 h时同时出现了抗拉强度和伸长率的峰值258 MPa和14.43%,比铸态的分别提高44 MPa和90.80%。
[Abstract]:A new type of Mg-6Zn-2Sm-0.4Zr alloy was prepared by adding 0.4%Zr and 2%Sm (mass fraction) to Mg-6Zn alloy. The microhardness and mechanical properties of cast Mg-6Zn-2Sm-0.4Zr alloy were studied by (OM), scanning electron microscopy (SEM) and energy dispersive (EDS), X-ray diffractometer (XRD),). Changes of microstructure and mechanical properties under aging treatment. The results show that the as-cast microstructure of the alloy is mainly composed of (伪-Mg, _ (41) Sm_5) eutectic with a continuous or semi-continuous distribution at the grain boundary of the matrix and an isolated dot phase within the crystal. In the time range of 440 鈩，
本文编号：2443420
[Abstract]:A new type of Mg-6Zn-2Sm-0.4Zr alloy was prepared by adding 0.4%Zr and 2%Sm (mass fraction) to Mg-6Zn alloy. The microhardness and mechanical properties of cast Mg-6Zn-2Sm-0.4Zr alloy were studied by (OM), scanning electron microscopy (SEM) and energy dispersive (EDS), X-ray diffractometer (XRD),). Changes of microstructure and mechanical properties under aging treatment. The results show that the as-cast microstructure of the alloy is mainly composed of (伪-Mg, _ (41) Sm_5) eutectic with a continuous or semi-continuous distribution at the grain boundary of the matrix and an isolated dot phase within the crystal. In the time range of 440 鈩，
本文编号：2443420
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