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首页> 外文期刊>Journal of Materials Engineering and Performance >Microstructure and Tensile Properties of Squeeze Cast Magnesium Alloy AM50
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Microstructure and Tensile Properties of Squeeze Cast Magnesium Alloy AM50

机译：挤压铸造镁合金AM50的组织和拉伸性能

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摘要

High-pressure die cast magnesium alloy AM50 is currently used extensively in large and complex shaped thin-wall automotive components. For further expansion of the alloy usage in automobiles, novel-manufacturing processes need to be developed. In this study, squeeze casting of AM50 alloy with a relatively thick cross section was carried out using a hydraulic press with an applied pressure of 70 MPa. Microstructure and mechanical properties of the squeeze cast AM50 with a cross-section thickness of 10 mm were characterized in comparison with the die cast counterpart. The squeeze cast AM50 alloy exhibits virtually no porosity in the microstructure as evaluated by both optical microscopy and the density measurement technique. The results of tensile testing indicate the improved tensile properties, specifically ultimate tensile strength and elongation, for the squeeze cast samples over the conventional high-pressure die cast parts. The analysis of tensile behavior show that the strain-hardening rate during the plastic deformation of the squeeze cast specimens is constantly higher than that of the die cast specimens. The scanning electron microscopy fractography evidently reveals the ductile fracture features of the squeeze cast alloy AM50.
机译：高压压铸镁合金AM50当前广泛用于大型和复杂形状的薄壁汽车零部件。为了进一步扩大汽车中合金的用途，需要开发新颖的制造工艺。在这项研究中，使用液压机在70 MPa的压力下对横截面相对较厚的AM50合金进行挤压铸造。与压铸件相比，横截面厚度为10 mm的挤压铸造AM50的显微组织和力学性能得到了表征。通过光学显微镜和密度测量技术评估，挤压铸造的AM50合金的微观结构几乎没有孔隙。拉伸测试的结果表明，与传统的高压压铸件相比，挤压铸造样品的拉伸性能得到了改善，特别是极限拉伸强度和伸长率得到了改善。拉伸行为分析表明，挤压铸造试样塑性变形过程中的应变硬化率始终高于压铸试样。扫描电子显微镜形貌明显地显示出挤压铸造合金AM50的韧性断裂特征。

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