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利用扫描电子显微镜(SEM)、透射电子显微镜(TEM)和X射线衍射(XRD)等方法研究了不同复合热处理(深冷处理+均匀化处理)工艺对再生3104铝合金的微观组织影响。XRD图谱表明,深冷处理使3104铝合金基体(200)晶面衍射峰相对强度升高甚至超过(111)晶面成为最强峰。经均匀化处理后,粗大析出相逐步溶入基体,部分最终呈粒状断续分布在晶界上,基体中也出现大量片状Al6Mn析出相。经先深冷处理后均匀化处理的再生3104铝合金中Al6Mn相尺寸最小,为(3.25±1.18)μm,在基体中分布也更加均匀,这主要是由于在深冷处理过程中产生大量位错,为析出相的扩散、形核提供了通道和形核核心。
The effects of different composite heat treatments (cryogenic treatment + homogenization treatment) on the microstructure of regenerated 3104 aluminum alloy were investigated by scanning electron microscopy (SEM), transmission electron microscopy (TEM) and X-ray diffraction (XRD) XRD patterns show that the relative intensities of the diffraction peaks of the (200) crystal plane of the 3104 aluminum alloy substrate increase or exceed the (111) crystal plane to become the strongest peak after cryogenic treatment. After the homogenization treatment, the coarse precipitates gradually dissolve into the matrix, and some of the particles finally appear in the grain boundaries intermittently distributed on the grain boundaries. A large number of flaky Al6Mn precipitates also appear in the matrix. The average size of Al6Mn phase in regenerated 3104 aluminum alloy after cryogenic treatment was the smallest (3.25 ± 1.18) μm, which was more uniform in the matrix. This was mainly due to the large number of dislocations in the cryogenic treatment, Precipitation phase precipitation, nucleation provides access and nucleation center.