Evolution of secondary phases and properties of 7B04 aluminum alloy during DC homogenization  

7B04铝合金直流电均匀化过程中的第二相和性能演化（英文）

作　　者：何立子[1] 贾品峰[1] 张林[2] 崔建忠[1] 

机构地区：[1]东北大学材料电磁过程研究教育部重点实验室,沈阳110819 [2]东北大学材料科学与工程学院,沈阳110819

出　　处：《Transactions of Nonferrous Metals Society of China》2016年第2期319-327,共9页中国有色金属学报（英文版）

基　　金：Project(5157406)supported by the National Natural Science Foundation of China

摘　　要：The effects of the direct current （DC） on the evolutions of hardness and morphology of the secondary phases in 7B04 aluminum alloy homogenized at 380？465 ℃ for 2 h were investigated in detail by electric conductivity measurement, hardness test, X-ray diffraction analysis, field emission scanning electron microscopy and energy dispersive spectrometry. The results show that with increasing temperature from 380 to 465 ℃, the electric conductivity of normal homogenized sample decreases from 34.9%IACS to 28.7%IACS, the hardness increases from HV 96 to HV 146, and the area fraction of secondary phase reduces from 4.5% to 1.89%. While, DC homogenized sample has a higher hardness, a lower electric conductivity and a smaller area fraction of secondary phases at the same temperature. The DC enhances the homogenization process by promoting the diffusibility of the solute atoms and the mobility of vacancy.采用电导率测量、硬度测试、X射线衍射分析、场发射扫描电镜观察和能谱分析方法,研究直流电对7B04铝合金在380-465℃均匀化2 h后的硬度和第二相形貌演化的影响。结果表明,当温度从380℃升高至465℃时,无电流均匀化试样的电导率由34.9%IACS降低至28.7%IACS,硬度由HV 96增加至HV 146,第二相的面积分数由4.5%减小至1.89%。在相同温度下,经直流电均匀化的试样具有较高的硬度、较低的电导率和较小的第二相面积分数。直流电通过促进溶质原子扩散能力和空位的可动性使均匀化效果增强。

关 键 词：7B04 aluminum alloy direct current HOMOGENIZATION HARDNESS secondary phase elemental diffusion 

分 类 号：TG146.21[一般工业技术—材料科学与工程]