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研究了 Al- 10 at% RE变质高锌铝合金的组织和性能。金属型铝合金组织为不发达的粗大α树枝晶 ,晶界上杂乱分布着大块状或长条状的富硅相及其它相。经钠盐精炼和 0 .2 wt% RE变质后 ,硅相和其它晶间相变为球状或细短条状 ,均匀分布在晶界上 ;合金生长形态发生较大变化 ,α树枝晶发达而细小 ,二次枝晶臂间距显著减小。变质后 ,抗拉强度提高了 2 9.5 % ,伸长率提高了 34 .8%。
The microstructure and properties of Al-10 at% RE metamorphic high-zinc aluminum alloy were studied. Metallic aluminum microstructure of underdeveloped coarse α dendrites, the grain boundary messy distribution of bulk or elongated silicon-rich phase and other phases. After sodium salt refining and 0.2 wt% RE metamorphism, the phase between the silicon phase and the other intergranular phase changes to spherical or thin strip, uniformly distributed on the grain boundary; the growth morphology of the alloy changes greatly and α dendrite developed Small, secondary dendrite arm spacing was significantly reduced. After metamorphism, tensile strength increased by 2 9.5%, elongation increased 34.8%.