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制备了Al-4Mg-0.15Ti-0.15Sc-0.15Zr合金,并对该铝合金进行了4次重熔。利用SEM、EDS、XRD等技术研究了重熔对合金组织和力学性能的影响。结果表明:重熔前,Ti、Zr、Sc与Al反应形成了多层塔状的Al_3(Sc_(1-x-y)Ti_xZr_y)初生相,作为形核质点,细化了基体组织。随着重熔次数增加,晶粒尺寸增大,尺寸均匀性降低,该初生相晶粒细化效果逐渐减弱,合金力学性能降低。这归因于多次重熔后熔体内有效形核质点数量减少,塔状Al_3(Sc_(1-x-y)Ti_xZr_y)形核质点粗化,并变为碎块状。
Al-4Mg-0.15Ti-0.15Sc-0.15Zr alloy was prepared and the aluminum alloy was remelted four times. The effects of remelting on the microstructure and mechanical properties of the alloy were studied by SEM, EDS and XRD. The results show that before remelting, Ti, Zr, Sc and Al react to form multilayered tower-shaped primary phase of Al_3 (Sc_ (1-x-y) Ti_xZr_y) as nucleation sites. With the increase of remelting times, the grain size increases and the uniformity of size decreases. The grain refinement effect of the primary phase gradually decreases and the mechanical properties of the alloy decrease. This is attributed to the reduction in the number of effective nucleation sites in the melt after multiple remelting, and the nucleation of Al_3 (Sc_ (1-x-y) Ti_xZr_y) grains in the pyramidal structure becomes coarse and becomes crumbling.