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IMPACT TOUGHNESS ENHANCEMENT OF MELT TREATED Al-Si-Mg CAST ALLOY

机译:熔融处理的Al-Si-mg铸造合金的冲击韧性增强

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The alloy toughness is influenced by the alloy composition and the melt treatments applied. The present work investigates the effects of different types of grain refiners on the impact properties of Sr-modified A356.2 alloys in as-cast and heated-treated conditions. The results show that the addition of Ti and B greatly improves the alloy toughness but only in a fully modified state, and the right type of master alloy and addition levels are used. The highest values for total absorbed energy of T6-tempered alloys are obtained after using Al-5%Ti-1%B and Al-10%Ti master alloys following upon the addition of 0.04% Ti. A significant deterioration in impact properties is observed due to the Sr-B interaction in some cases. The improvements in toughness may be attributed primarily to the change in silicon particle morphology and to the dissolution and fragmentation of a number of the intermetallics formed during the T6 temper.
机译:合金韧性受合金组成的影响和应用的熔体处理。本作者研究了不同类型的晶粒炼油机对浇铸和加热处理条件下SR改性A356.2合金的影响性能的影响。结果表明,添加Ti和B的添加大大改善了合金韧性,而是仅在完全改性状态下,使用右型母合金和添加水平。在加入0.04%Ti后,在使用Al-5%Ti-1%B和Al-10%Ti主合金之后获得T6回火合金的总吸收能量的最高值。由于在某些情况下,由于SR-B相互作用,观察到抗冲击性能显着劣化。韧性的改善可以主要归因于硅颗粒形态的变化以及在T6脾气期间形成的许多金属间金属间的溶解和破碎。

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