2E12铝合金均匀化过程微观组织演变规律
发布时间：2018-10-15 20:33
【摘要】：采用SEM,EPMA,TEM和硬度测试等技术,研究2E12铝合金铸锭在均匀化过程中的非平衡相溶解、元素分布特征以及第二相析出行为。研究结果表明:合金铸锭的晶界处连续分布着粗大的α+θ+S共晶组织。合金中的Cu和Mg元素存在明显的偏析,而Mn元素分布较为均匀。随着均匀化处理的进行,合金中的粗大共晶组织逐渐溶解,Cu,Mg和Si元素逐步溶入合金基体,而Fe和Mn元素则从合金基体中脱溶。在均匀化处理过程中,合金基体中析出大量T相粒子。伴随着T相的析出,合金的硬度逐渐升高,同时电导率也明显增加。当合金于490℃均匀化1 000 h后,晶界附近出现明显的PFZ。
[Abstract]:SEM,EPMA,TEM and hardness testing techniques were used to study the dissolving of non-equilibrium phase, the distribution of elements and the precipitation behavior of the second phase in 2E12 aluminum alloy ingot during homogenization. The results show that the coarse 伪 胃 S eutectic structure is continuously distributed at the grain boundary of the alloy ingot. The Cu and Mg elements in the alloy are segregated obviously, while the distribution of Mn elements is more uniform. With the homogenization treatment, the coarse eutectic structure of the alloy gradually dissolved, the elements of Cu,Mg and Si gradually dissolved into the alloy matrix, while the elements of Fe and Mn dissolved from the alloy matrix. During homogenization, a large number of T phase particles were precipitated from the alloy matrix. Along with the precipitation of T phase, the hardness and conductivity of the alloy increased gradually. When the alloy was homogenized at 490 鈩，
本文编号：2273758
[Abstract]:SEM,EPMA,TEM and hardness testing techniques were used to study the dissolving of non-equilibrium phase, the distribution of elements and the precipitation behavior of the second phase in 2E12 aluminum alloy ingot during homogenization. The results show that the coarse 伪 胃 S eutectic structure is continuously distributed at the grain boundary of the alloy ingot. The Cu and Mg elements in the alloy are segregated obviously, while the distribution of Mn elements is more uniform. With the homogenization treatment, the coarse eutectic structure of the alloy gradually dissolved, the elements of Cu,Mg and Si gradually dissolved into the alloy matrix, while the elements of Fe and Mn dissolved from the alloy matrix. During homogenization, a large number of T phase particles were precipitated from the alloy matrix. Along with the precipitation of T phase, the hardness and conductivity of the alloy increased gradually. When the alloy was homogenized at 490 鈩，
本文编号：2273758
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