Mg、Ag、Zn多元复合微合金化Al-Cu-Li合金在均匀化中的显微组织演变（英文）

发布时间：2018-03-08 02:22

本文选题：Al-Cu-Li合金　切入点：均匀化　出处：《Transactions of Nonferrous Metals Society of China》2016年03期 　论文类型：期刊论文

【摘要】：利用光学显微镜(OM)、差示扫描热分析法(DSC)、电子探针(EPMA)、X衍射(XRD)等研究手段分析Mg、Ag、Zn复合微合金化的Al-3.8Cu-1.28Li(质量分数,%)合金在均匀化过程中的组织转变。结果表明:合金的铸态组织中存在严重的枝晶偏析,此时合金中含有TB(Al_7Cu_4Li)、θ(Al_2Cu)、R(Al_5CuLi_3)、S(Al_2CuMg)相以及少量的(Mg+Ag+Zn)复合相与AlCuFeMn相。当第二级均匀化时间为2 h时,第二相含量大幅度降低。随着均匀化时间的延长,T_B、θ、R、S和(Mg+Ag+Zn)复合相能全部溶入基体,从而合金的枝晶偏析消除,且合金的均匀化过程可以用一指数方程描述。但是AlCuFeMn相似乎转变成Al_7Cu_2Fe和AlCuMn相,其中Al_7Cu_2Fe的尺寸几乎不发生变化。
[Abstract]:By means of optical microscope, differential scanning calorimetry (DSC) and electron probe microprobe (EPMA) X diffraction (XRD), the microstructure transformation of Al-3.8Cu-1.28LiAl (mass fraction) alloy of Al-3.8Cu-1.28 (mass fraction) alloy was studied. The results showed that the cast of the alloy was carried out in the process of homogenization. There is a serious dendritic segregation in the structure. At the same time, the alloy contains TBB AlAl7Cu4LiLi, 胃 Al2CuCU / RSP Al5CuLi3S / SSP / Al2CuMg) and a small amount of Mg-Ag / ZnZn / AlCuFeMn phases. When the second stage homogenization time is 2 h, the content of the second phase decreases significantly. With the prolongation of the homogenization time, the composite phases of TB-, 胃-Rns and MgAg can all be dissolved into the matrix, and when the second stage homogenization time is 2 h, the content of the second phase decreases significantly. Thus the dendritic segregation of the alloy is eliminated and the homogenization process of the alloy can be described by an exponential equation, but the AlCuFeMn phase appears to be transformed into Al_7Cu_2Fe and AlCuMn phases, in which the size of Al_7Cu_2Fe hardly changes.
【作者单位】：中南大学材料科学与工程学院;航天材料及工艺研究所;
【基金】：Project(2013JSJJ0001)supported by Teachers’Research Found,China Project(2013AA032401)supported by the National High Technology Research and Development Program of China Project supported by the Nonferrous Metal Oriented Advanced Structural Materials and Manufacturing Cooperative Innovation Center,China
【分类号】：TG146.21

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