通过热处理工艺的调整获取了具有不同‘6-α’转化(即(Fe,Mn) Al6相转化为α-Al12(Fe,Mn)3Si相)特征的Al-Mn-Mg合金初始试样,采用高分辨扫描电镜(SEM)对初始试样中‘6-α’的转化现象以及转化后α相的微观形貌特征进行了表征分析,并对各组试样进行热轧以研究该转化对形变过程中化合物破碎的影响.结果表明,‘6-α’转化有助于合金中粗大化合物的分裂和破碎,化合物破碎后会在进一步的形变过程中随基体流动进而改善其自身的分布状态,相对含量的多少以及疏松多孔的内部结构是α相帮助化合物充分破碎的关键因素.
Several groups of Al-Mn-Mg alloy samples with different ‘ 6-α’ transformation (i.e.transformation from (Fe,Mn) Al6 phase to α-Al12 (Fe,Mn)3Si phase) features were obtained through homogenization heat treatment.The microstructure of α phase after transformation was characterized by means of high resolution SEM.Then,the samples were hot rolled in order to study the effect of transformation on fracture of intermetallic particles during deformation process.The results show that the ‘6-α’ transformation is helpful for the fracture of coarse intermetallic particles during rolling.Particle fragments can flow with the matrix during later deformation process,resulting in better particle distribution.Effects of content and structure of α phase on fracture of the coarse intermetallic particles during deformation are also discussed.
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