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首页> 外文会议>63rd World Foundry Congress Sep 12-18, 1998 Budapest, Hungary >BERYLLIUM EFFECTS ON THE MICROSTRUCTURE AND MECHANICAL PROPERTIES OF A356 ALUMINIUM CASTING ALLOY
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BERYLLIUM EFFECTS ON THE MICROSTRUCTURE AND MECHANICAL PROPERTIES OF A356 ALUMINIUM CASTING ALLOY

机译：铍对A356铝合金铸造组织和力学性能的影响

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Microstructure of A356 aluminium alloys cast in the permanent mold was investigated by optical microscope and image analyzer, with particular respect to the shape and size distribution of iron intermetallics known as β-phase (Al_5FeSi). Morphologies of the β-phase was found to change gradually with the Be:Fe ratio like these. In Be-free alloys, β-phase with needlelike morphology was well developed, but script phase was appeared when the Ee:Fe ratio is above 0.2:1. With the Be:Fe ratios of 0.4:1-1:1, script phase as well as Be-rich phase was also observed. In case of higher Be addition, above 1:1, Be-rich phase was observed on all regions of the specimens, and increasing of the Be:Fe ratios gradually make the Be-rich phase coarse. It was also observed that the β-phase with needlelike morphology was coarsened with increase of the Fe content in Be-free alloys. However, in Be-added alloys, length and number of these β-phases were considerably decreased with the increased Be:Fe ratio. Beryllium addition improved tensile properties and impact toughness of the A356 aluminium alloy, due to the formation of phase. The DSC tests indicated that the presence of Be could increase the amount of Mg which is available for Mg_2Si precipitate hardening, and enhance the precipitation kinetics by lowering the ternary eutectic temperature.
机译：通过光学显微镜和图像分析仪研究了在永久铸模中铸造的A356铝合金的显微组织，特别是关于称为β相（Al_5FeSi）的铁金属间化合物的形状和尺寸分布。发现β相的形貌随着Be：Fe之比而逐渐变化。在无Be合金中，具有针状形态的β相得到了很好的发展，但当Ee：Fe比率大于0.2：1时，出现了脚本相。当Be：Fe比为0.4：1-1：1时，还观察到脚本相和富Be相。在较高的Be添加量，高于1：1的情况下，在样品的所有区域均观察到富Be相，并且Be∶Fe比的增加逐渐使富Be相变粗。还观察到，随着无Be合金中Fe含量的增加，具有针状形态的β相被粗化。但是，在Be合金中，随着Be∶Fe比的增加，这些β相的长度和数量显着减少。由于形成相，添加铍改善了A356铝合金的拉伸性能和冲击韧性。 DSC测试表明，Be的存在可以增加可用于Mg_2Si沉淀硬化的Mg的量，并通过降低三元共晶温度来提高沉淀动力学。

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