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首页> 外文期刊>Materials Science and Engineering >Effect of Ca additions on the microstructure, thermal stability and mechanical properties of a cast AM60 magnesium alloy
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Effect of Ca additions on the microstructure, thermal stability and mechanical properties of a cast AM60 magnesium alloy

机译：Ca的添加对铸造AM60镁合金的组织，热稳定性和力学性能的影响

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摘要

The effect of 0.5,1.2, and 2.0 wt.% Ca additions on the microstructure, thermal stability, and mechanical properties of the cast Mg-6Al-0.3Mn alloy (AM60) was investigated. Addition of 0.5 wt.% Ca did not form any new phase but suppressed the discontinuous precipitation of the β-Mg_(17)Al_(12) phase by being dissolved in both the second phase and magnesium matrix. In the materials containing higher amounts of Ca, however, the Al_2Ca phase with a lamellar morphology appeared in the microstructure and the volume fraction of β-Mg_(17)Al_(12) diminished. It was found that Ca generally refines the microstructure and enhances the thermal stability of the alloy. This was documented by the retention of the initial fine dendritic microstructure, hardness, and ultimate shear strength (USS) of the Ca-containing materials after long-term annealing at 673 K. The observed improvements are believed to be caused by the solid solution strengthening of Ca in the Mg matrix, and the particle strengthening effects of the thermally stable Al_2Ca phase which are formed as an interconnected network. This behavior is in contrast to that of the base material which developed a coarse grain structure with decreased strength and hardness after the same thermal treatment.
机译：研究了添加0.5、1.2和2.0 wt。％的Ca对铸造Mg-6Al-0.3Mn合金（AM60）的组织，热稳定性和力学性能的影响。添加0.5重量％的Ca不会形成任何新相，但是通过溶解在第二相和镁基质中，抑制了β-Mg_（17）Al_（12）相的不连续沉淀。但是，在含有大量Ca的材料中，在组织中出现层状形态的Al_2Ca相，β-Mg_（17）Al_（12）的体积分数减少。发现Ca通常改善了显微组织并增强了合金的热稳定性。这是通过在673 K长期退火后，保留了含Ca的材料的初始树枝状微结构，硬度和极限剪切强度（USS）来记录的。据信所观察到的改善是由于固溶体强化Mg基质中Ca的含量，以及形成互连网络的热稳定Al_2Ca相的颗粒强化效果。该行为与基材的行为相反，该基材在相同的热处理后形成具有降低的强度和硬度的粗晶粒结构。

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