超声外场对7085铝合金基体组织及第二相的影响

发布时间：2018-03-02 03:14

本文关键词： 铝合金超声凝固基体组织第二相　出处：《中南大学学报(自然科学版)》2015年07期 　论文类型：期刊论文

【摘要】：采用光学显微镜(OM)、扫描电镜(SEM)和电子探针(EPMA)等技术研究超声外场对7085铝合金基体组织以及第二相组织的影响规律。研究结果表明:与未施加超声外场的铸锭相比,经过超声外场处理的铸锭中呈现出大量尺寸细小、分布均匀的等轴晶组织,平均晶粒粒径减小到176μm,Zn和Mg在基体中的固溶度分别提高22%和54%;超声外场下,第二相组织的形貌和尺寸也得到很大的改善,失去长条状和针状的特征,呈现出细小弥散的第二相组织,θ+T共晶组织平均长度减少20%,Al3Fe相平均长度减少32%,Mg2Si相平均长度减少45%,Al3Fe相和Mg2Si相中的合金元素部分被固溶到基体组织中。
[Abstract]:The effects of ultrasonic field on the matrix structure and the second phase structure of 7085 aluminum alloy were studied by means of optical microscope, scanning electron microscope (SEM) and electron probe microprobe (EPMA). The results show that the effect of ultrasonic field on the matrix and the second phase structure of 7085 aluminum alloy is compared with that of the ingot without ultrasonic field. In the ingot treated by ultrasonic external field, a large number of fine and uniformly distributed equiaxed grains were found, and the average grain size decreased to 176 渭 m Zn and mg in the matrix increased by 22% and 54, respectively, under the ultrasonic field, the solid solubility of Zn and mg in the matrix was increased by 22% and 54, respectively. The morphology and size of the second phase have also been greatly improved, losing the long and needle-like features. The average length of 胃 T eutectic phase is reduced by 20% and the average length of Al _ 3Fe phase is reduced by 32% mg _ 2Si phase. The average length of alloy element in Al _ 3Fe phase and Mg2Si phase is reduced by 45% Al _ 3Fe phase and 45% Al _ 3Fe phase.
【作者单位】：中南大学机电工程学院高性能复杂制造国家重点实验室;
【基金】：国家重点基础研究发展规划(973计划)项目(2010CB731706,2012CB619504)~~
【分类号】：TG292

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