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首页> 外文期刊>Journal of Materials Engineering and Performance >Influence of Applied Pressure on Tensile Behaviour and Microstructure of Squeeze Cast Mg Alloy AM50 with Ca Addition
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Influence of Applied Pressure on Tensile Behaviour and Microstructure of Squeeze Cast Mg Alloy AM50 with Ca Addition

机译：施加压力对添加Ca的挤压铸造镁合金AM50的拉伸行为和组织的影响

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摘要

The development of alternative manufacturing processes is essential for the success in applying Ca-containing magnesium alloys for automotive applications due to their relatively poor die castability. Squeeze casting with its inherent advantages has been demonstrated capable of minimizing the formation of casting defects in Mg-Al-Ca alloys. In this study, the effect of applied pressures on tensile behavior and microstructure of squeeze cast Mg-5wt.%Al-1%wt.%Ca alloy (AMX501) was investigated with the applied pressure varying from 3 to 90 MPa. The results of tensile testing indicate that the tensile properties of AMX501 alloy including ultimate tensile strength, yield strength, and elongation (E_f) increase from 153.7, 80 MPa and 3.26% to 183.7, 90.5, and 5.42% with increasing applied pressure levels from 3 to 90 MPa, respectively. The analysis of true stress versus strain curves shows that an increase in applied pressure levels result in high straining hardening rates during the plastic deformation of the alloy. Microstructural analysis and density measurements indicate that, as the applied pressure increases, the porosity levels of the alloy decrease considerably, despite of almost no significant reduction in grain sizes of the squeeze cast alloys due to their high aspect ratio of cylindrical castings. Hence, the improvement in tensile properties should be primarily attributed to casting densification resulting from applied pressures. The scanning electron microscopy observation on fractured surfaces reveals that the fracture modes of the squeeze cast alloys transit to ductile from brittle with increasing applied pressures.
机译：替代制造工艺的发展对于成功地将含钙镁合金应用于汽车应用至关重要，因为它们的压铸性能相对较差。挤压铸造具有其固有的优势，已被证明能够最大程度地减少Mg-Al-Ca合金中铸造缺陷的形成。在这项研究中，研究了施加压力对挤压铸造Mg-5wt。％Al-1％wt。％Ca合金（AMX501）的拉伸行为和显微组织的影响，施加压力在3到90 MPa之间变化。拉伸测试结果表明，随着施加压力水平从3提高，包括极限拉伸强度，屈服强度和伸长率（E_f）在内的AMX501合金的拉伸性能从153.7、80 MPa和3.26％增长至183.7、90.5和5.42％。分别达到90 MPa。真实应力与应变曲线的分析表明，施加压力水平的增加会导致合金塑性变形期间的高应变硬化速率。显微组织分析和密度测量表明，随着施加压力的增加，合金的孔隙率水平显着降低，尽管挤压铸造合金的晶粒尺寸几乎没有明显减小，这是因为它们的圆柱铸件纵横比很高。因此，拉伸性能的改善应主要归因于施加压力导致的铸件致密化。扫描电子显微镜观察到的断裂表面表明，随着施加压力的增加，挤压铸造合金的断裂模式从脆性转变为韧性。

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