【作者】 陈春梅；

【导师】 安健；

【作者基本信息】 吉林大学 ， 材料学， 2006， 硕士

【摘要】 本文在研究了快冷及常规铸造两种合金制备方法获得的Mg₉₇Zn)₁Y₂合金的组织、力学性能,尤其是对常规铸造Mg₉₇Zn₁Y₂合金的高温性能和摩擦磨损特性作了系统的研究。分别对两种合金制备方法获得的合金进行了EDS和XRD分析,确定了所制备合金的成份、原子比例和相组成。将薄带状的合金进行不同温度的退火处理,观察合金的组织和性能随退火温度的变化规律。然后探讨了常规铸造Mg₉₇Zn₁Y₂合金在不同温度下的抗拉强度、屈服强度及断裂延伸率,此外还在不同载荷和不同滑动速度的实验条件下研究了常规铸造合金的摩擦磨损性能,并与AZ91合金的性能对比,用扫描电镜对其拉伸断口形貌、磨损表面、亚表面形貌做出分析,又分别计算了两种合金的磨损表面温度及磨损表面闪温,最后探讨了它们的磨损机制和磨损性能的差异。更多还原

【Abstract】 In order to save materials and energy, the study and development on light castings has been an important research field and developing direction. Magnesium alloys have low density, high specific strength and specific stiffness, etc. So magnesium alloys have been widely used to reduce the car in automotive industry, it also becomes a focus in the field of material science. Despite of the growing interest in magnesium alloys, very little data exist on their friction and wear behavior. Wear is also one of important factors which limit the applications of magnesium alloys, and because Mg-Zn-Y alloy with the chemical composition of Mg-1～3at%Zn-2～6at%Y reveals excellent mechanical properties, specially at 97:1:2 at%. In this paper we studied the microstructure and mechanical properties of the alloys by melt-spun and traditional casting methods, especially friction and wear characteristics of the alloys by traditional casting methods .It has practical value on industrial production, and also will offer some theoretical foundations for expanding applications of magnesium alloys.At first, the ingredient and the atomic proportion of the melt-spun and casting alloys were determined by EDS and the XRD analysis, and then the microstructure was studied. The phase analysis indicated that, it consists of the substrateα-Mg and strengthened Mg12YZn. And magnesium, zinc and yttrium three kinds of element atomic proportion approximately close to 97:1:2, it is identical with designing.The melt-spun alloy was annealed at different temperatures, the microstructure and mechanical properties of alloys with different temperatures were investigated, the microstructure of the alloys were refined obviously at room temperature, were coagulated with increasing annealing temperature. The biggest hardness was 127.49Hv at 773K for annealing.The ultimate tensile strength, yield strength and elongation to failure of the更多还原