摘要
利用金相显微镜(OM)、X射线衍射分析(XRD)、扫描电子显微镜(SEM)等手段观察分析了铸态Mg-8Sn-xCa合金组织,并且通过显微硬度及压缩强度等性能,研究Ca含量对Mg-8Sn合金力学性能的影响。研究发现,Ca的添加使得Mg-8Sn合金组织中形成明显的棒状及针状CaMgSn相,随着Ca含量的增加,CaMgSn相尺寸明显变大,并且其有效细化了基体的晶粒尺寸。Ca含量的添加使得合金强度明显提高,但使合金塑性降低;Mg-8Sn-1Ca合金在强度明显提高的同时,保持了较好的塑性;当Ca含量大于1%时,合金强化效果减弱,材料塑性下降明显。
The microstructure of Mg-8Sn-xCa alloys was studied by optical microscope(OM),X-ray diffraction and scanning electron microscope(SEM)in this paper.And the effects of Ca content on the micro-hardness and compressive properties of Mg-8Sn alloy were investigated.The results show that the rod-like and needle-like CaMgSn phase formed in Mg-8Sn alloy with Ca addition.The size of CaMgSn laths increased with the increase of Ca content.Meanwhile,Ca addition refined the grain size.The addition of Ca improves the strength of Mg-8Sn alloy and decrease the elastic of Mg-8Sn alloy.However,when the Ca content reached to 1%,the continue increase of Ca content created a weak effect on the strength improvement and obviously reduced the elastic of Mg-Sn alloy.Mg-8Sn-1Ca alloy obtained an improved strength with a preferable elastic.
引文
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