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《The Chinese Journal of Nonferrous Metals》 2010-02
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Homogenizing heat treatment of 2124 aluminum alloy

LI Cheng-lü, PAN Qing-lin, LIU Xiao-yan, HE Yun-bin, LI Wen-bin (School of Materials Science and Engineering, Central South University, Changsha 410083, China)  
The evolution of the microstructure and the composition distribution of as-cast and homogenized 2124 aluminum alloy were studied by optical microscopy (OM), differential scanning calorimetry (DSC), scanning electron microscopy (SEM), energy dispersive X-ray diffractometry (EDX), transmission electron microscopy (TEM) and X-ray diffractometry (XRD). The results show that serious dendrite segregation exists in the 2124 alloy ingot, and many eutectic phases with low melting-point exist in the grain boundary. Cu, Mg and Mn elements distribute unevenly from the grain boundary to inside of the alloy. The non-equilibrium eutectic phases dissolve after homogenization, and the grain boundary becomes sparse and all elements become more homogenized. The over-burnt temperature is 504 ℃. And the proper homogenizing process of the 2124 alloy is (490 ℃, 24 h), which is corresponding with the results of homogenizing kinetic equation.
【Fund】: 国防科技资助项目(JGPT-SD-031)
【CateGory Index】: TG166.3
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