通过光学显微镜、扫描电子显微镜、透射电镜、X射线衍射仪、高温拉伸试验机等对不同状态下Mg-12Gd-3Y-0.5Zr镁合金的显微组织、高温力学性能及时效析出相进行了分析。结果表明：该合金铸态组织由α-Mg固溶体、Mg5Gd析出相及α-Mg＋Mg24Y5共晶体组成;挤压变形后合金的晶粒尺寸明显减小;合金挤压轧制板材在常温及150℃时有较高的抗拉强度,当温度进一步升高时强度下降较快;合金轧制板材时效析出相在高温（高于250℃）拉伸过程中没有发生相变,但在拉伸过程中会改变分布及形貌,使得变形抗力减小。
The microstructure,high temperature mechanical properties and the precipitation phase of Mg-12Gd-3Y-0.5Zr alloy under different states were investigated by using optical microscopy,scanning electron microscopy,transmission electron microscopy,X-ray diffraction and high temperature tensile testing machine.The results show that the as-cast alloy was consisted of α-Mg solid-solution and Mg5Gd precipitation phase and α-Mg＋Mg24Y5 eutectic.The grains size of the alloy decreased obviously after hot extrusion.The extruded and rolled sheets had fairly high tensile strength at room temperature and 150 ℃,and the strength decreased rapidly as the temperature raised further.The aging precipitate phases of the alloy sheet did not change in the process of high temperature（250 ℃）extruding,but the distribution and morphology were changed,which led to the decrease of deformation resistance.
参考文献
| [1] | Ifeanyi Anthony Anyanwu;Shigeharu Kamado;Yo Kojima .Aging Characteristics and High Temperature Tensile Properties of Mg-Gd-Y-Zr Alloys[J].Materials transactions,2001(7):1206-1211. |
| [2] | 郭永春,刘涛,李建平,杨忠,梁民宪,夏峰.Mg-12Gd-4Y-1Zn-0.5Zr合金的显微组织和力学性能[J].西安工业大学学报,2007(03):242-246. |
| [3] | Vostry P.;Stulikova I.;Von Buch F.;Mordike B.L.;Smola B. .Microstructure evolution in isochronally heat treated Mg-Gd alloys[J].Physica Status Solidi, A. Applied Research,1999(2):491-500. |
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