Ca对Mg-5.5Al-1.2Y镁合金显微组织和力学性能的影响
Effects of Ca on Microstructure and Mechanical Properties of Mg-5.5Al-1.2Y alloy Magnesium Alloy
李长青
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作者单位：河南科技大学
中文关键字：Ca；镁合金；显微组织；力学性能
英文关键字：Ca; magnesium alloy; microstructure; mechanical properties
中文摘要：采用XRD、OM、SEM和EDS等手段研究了Ca对Mg-5.5Al-1.2Y合金的显微组织和力学性能的影响。实验结果表明，加入适量的Ca后， Mg17Al12相数量减少，Al2Y相得到细化，同时基体中出现高熔点相Al2Ca相和Al4Ca。随着Ca含量的增加，合金的室温（25℃）和高温（150℃和175℃）力学性能先升高后降低，且在Ca含量为0.8%时达到最佳。
英文摘要：The effects of Ca on the microstructures and mechanical properties of Mg-5.5Al-1.2Y magnesium alloy were investigated through OM, SEM, EDS and XRD. The results show that appropriate addition of Ca into Mg-5.5Al-1.2Y magnesium alloy can reduce the quantity of β-Mg17Al12 phase, refine Al2Y phase and cause the formation of high-melting-point phase Al2Ca and Al4Ca in the matrix. With the increase of Ca addition, the mechanical properties of the alloys at room and elevated temperature(150℃ and 175℃) increase at first, and then decreases, and reach the peaks at 0.8% Ca.