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为探索和改善轧制包铝镁合金板的界面结合状况,用气体保护铸造法制备1060/Mg-2.0Mn-0.6Ca包铝镁合金锭。用OM,SEM,EDS和XRD等对复合铸锭基体及界面的显微组织和相结构进行观察和分析。结果表明:Mg-2.0Mn-0.6Ca合金的铸态组织由α-Mg基体相,弥散分布的粒状β-Mn相以及少量沿晶界分布的片层状α-Mg+Mg2Ca共晶体组成。铸造包铝镁合金锭界面形成扩散溶解层,扩散溶解层由α-Mg固溶体、α-Mg+β-Mg17Al12共晶层、β-Mg17Al12及AlMg化合物层组成,并在共晶层组织中弥散分布有短杆状Al9Mn相。铸造Mg-2.0Mn-0.6Ca合金界面附近扩散溶解层形成是微区“熔池”重结晶的过程,而在Al1060界面附近,扩散层形成是扩散型固态相变的过程。
In order to explore and improve the interfacial bonding of aluminum-magnesium alloy rolled sheet, a 1060 / Mg-2.0Mn-0.6Ca aluminum-magnesium alloy ingot was prepared by gas-shielded casting. The microstructure and phase structure of the composite ingot substrate and interface were observed and analyzed by OM, SEM, EDS and XRD. The results show that the as-cast microstructure of Mg-2.0Mn-0.6Ca alloy consists of α-Mg matrix phase, dispersed β-Mn phase and a little lamellar α-Mg + Mg2Ca eutectic phase distributed along grain boundary. The diffusion-dissolution layer was formed at the interface of the cast aluminum-magnesium alloy ingot. The diffusion-dissolution layer consisted of α-Mg solid solution, α-Mg + β-Mg17Al12 eutectic layer, β-Mg17Al12 and AlMg compound layer and dispersed in the eutectic layer A short rod Al9Mn phase. The formation of diffusive dissolution layer near the interface of the as-cast Mg-2.0Mn-0.6Ca alloy is the process of recrystallization in the micro zone “molten pool ”. In the vicinity of the Al1060 interface, diffusion layer formation is the process of diffusion-type solid state transformation.