Role of secondary phase in microstructural stability of as-extruded Mg-Sn-Ca at high temperature
Role of secondary phase in microstructural stability of as-extruded Mg-Sn-Ca at high temperature
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第二相对挤压态 Mg-Sn-Ca 高温微观结构稳定性的作用
DOI：
10.1080/02670836.2016.1148218
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发表时间：
2016
影响因子：
1.8
通讯作者：
Pan F
中科院分区：
文献类型：
--
作者：
Zhang J;Liu B;Jiang B;Yang H;Zhou G;Dai J;Pan F
利用光学显微镜（OM）、扫描电镜（SEM）研究了3种挤压态镁合金（Mg-0.6Ca、Mg-1.9Sn和Mg-1.9Sn-0.6Ca）在高温（673 K）下的组织稳定性，并通过拉伸试验研究了其对力学性能的影响。Mg-1.9Sn-0.6Ca合金的晶粒尺寸在高温下基本保持不变，Mg-0.6Ca合金的晶粒有一定程度的长大，Mg-1.9Sn合金的晶粒严重粗化。此外，Mg-1.9Sn-0.6Ca的拉伸强度也是最热稳定的。挤压态Mg-1.9Sn-0.6Ca合金优异的显微组织和力学稳定性归因于稳定的CaMgSn第二相的强钉扎效应。Mg-0.6Ca和Mg-1.9Sn的性能差分别是由于Mg 2Ca和Mg 2Sn颗粒的溶解。
The microstructural stability in three as-extruded Mg alloys (Mg–0.6Ca, Mg–1.9Sn and Mg–1.9Sn–0.6Ca) at high temperature (673 K) is studied by optical microscope (OM), scanning electron microscopy (SEM), and its effect on the mechanical properties is tested by tensile test. The grain size of Mg–1.9Sn–0.6Ca alloy is retained at high temperature, while grains in Mg–0.6Ca grow at some degree and in Mg–1.9Sn they coarsen seriously. Additionally, the tensile strength of Mg–1.9Sn–0.6Ca is also most thermally stable. The outstanding microstructural and mechanical stability of as-extruded Mg–1.9Sn–0.6Ca alloy is attributed to the strong pinning effect of stable CaMgSn secondary phase. The poor performances of Mg–0.6Ca and Mg–1.9Sn are due to the dissolution of Mg2Ca and Mg2Sn particles, respectively.