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首页> 外文期刊>Materials Science and Engineering >Mg_(17)Al_(12) phase refinement and the improved mechanical performance of Mg-6Al alloy with trace erbium addition
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Mg_(17)Al_(12) phase refinement and the improved mechanical performance of Mg-6Al alloy with trace erbium addition

机译：Mg_（17）AL_（12）相质化和痕量铒加成的Mg-6al合金的改进机械性能

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With an improvement in room temperature ductility, the automotive use of cast Mg-Al alloys can be extended to structural body components. This is challenging since Al readily forms brittle intermetallics with the alloying additions such as rare earths and limits their solid solubility largely, nullifying the potential beneficial effects of rare earth elements on plasticity e.g. on stacking fault energy. In this study, significant improvement of mechanical properties in Mg-6wt% Al (Mg-6Al) casting alloy was seen with low levels of Er additions (60 ppm and 880 ppm) that was related to the modifying effect of Er on the Mg_(17)Al_(12) precipitates and the α-Mg. Thermo-dynamic simulations, atom probe tomography, scanning electron microscopy, X-rays diffraction and mechanical testing were employed to understand the modification mechanism in Mg-6Al. According to Scheil solidification simulations, Al_2Er Laves co-precipitates at the same temperature as Mg_(17)Al_(12) exerting an inoculating effect when Er is at trace levels in the bulk alloy; however, when Er in the alloy increases, Al_2Er forms at higher temperatures much before Mg_(17)Al_(12) losing its inoculant potential. It was also seen that Er is soluble in Mg_(17)Al_(12) causing changes to its lattice parameter and cell volume. Tensile strength, ductility, compressive strain to fracture and hardness are influenced by microstructural refinement. Yield strength at the higher level of Er (880 ppm) can be explained by the existence of Er-rich intermetallics while the yield strength at low levels of Er (60 ppm) can more likely be explained by the nature of β-phase.
机译：随着室温延展性的改善，铸造Mg-Al合金的汽车使用可以扩展到结构体组分。这是具有挑战性，因为Al容易形成脆性金属间金属间金属间金属间金属化合物，如稀土，并在很大程度上限制它们的固体溶解度，使稀土元素对可塑性的潜在有益效果造成。关于堆叠故障能量。在该研究中，用低水平的ER添加（60ppm和880ppm）观察Mg-6wt％Al（Mg-6Al）铸造合金的机械性能显着改善，与Mg_上的ER的改性效果有关（ 17）Al_（12）沉淀物和α-mg。采用热动力模拟，原子探测层析造影，扫描电子显微镜，X射线衍射和机械测试，以了解MG-6AL中的改性机制。根据Scheil凝固模拟，Al_2er Laves在与散装合金中的痕量水平处于施加接种效果的Mg_（17）Al_（12）的相同温度下共析出;然而，当合金中的ER增加时，在Mg_（17）Al_（12）造成其接种潜力之前，Al_2er在更高的温度下形成。还可以看出，ER可溶于Mg_（17）AL_（12），导致其晶格参数和细胞体积的变化。拉伸强度，延展性，压缩裂缝和硬度的压缩应变受微观结构细化的影响。在ER（880ppm）的屈服强度可以通过富含ER的金属间化合物来解释ER富含ER的金属间质量，而β相的性质可以解释低水平ER（60ppm）的屈服强度。

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