采用SEM背散射电子(BSE)技术以及能谱(EDS)等手段定量研究了加热温度和保温时间对AA3104铝合金中(Fe, Mn)Al6相向α-Al12(Fe, Mn)3Si相转变作用规律, 通过连续截面方法对600 ℃保温条件下不同阶段的共晶相(即 (Fe, Mn)Al6相及α-Al12(Fe, Mn)3Si相)形貌进行三维重构, 从三维角度揭示了转化各阶段共晶相的三维形态. 对转变过程中标志性的铝点进行了定量表征, 结果表明在转化的不同阶段, 对应的铝点形貌特征也不尽相同, 在均匀化进行到一定阶段后, 大量铝点通过扩散而消失, 导致α相体积明显减小. 分析了转化后α相的微观形貌特征, 认为转化后存在的脆弱“双相”界面以及α相内部“疏松多孔”的状态, 将有助于其在轧制过程中的破碎.
张永皞
,
张志清
,
Robert E. Sanders
,
刘庆
. AA3104铝合金均匀化过程中的(Fe, Mn)Al6相向α-Al12(Fe, Mn)3Si相转变研究[J]. 金属学报, 2012
, 48(3)
: 351
-356
.
DOI: 10.3724/SP.J.1037.2011.00689
The effect of heating temperature and holding time on the phase transformation from (Fe, Mn)Al6 to α-Al12(Fe, Mn)3Si in AA3104 aluminum alloy during homogenization was studied by BSE and EDS in SEM. The 3D morphology of the eutectic phases heated at 600 ℃ for different holding times was reconstructed by a novel serial sectioning method. Evolution of the microstructure could be revealed in 3D for the first time. Al spots were observed within the α-Al12(Fe, Mn)3Si phase and counted during different transformation stages. Large number of Al spots disappeared by diffusing into the neighboring matrix after extended heating times, while the volume of the α phase was also decreased at the same time. The microstructure of the α phase after transformation was analyzed, showing ‘duplex interfaces’created by partly transformed particles. The dense holes within α phase particles are believed to promote particle break up during hot rolling of the omogenized material.
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