摘要
利用先进摩擦增材制造技术(AFAM)制备出7050铝合金试样,采用光学显微镜、扫描电镜、显微硬度测试仪的方法,研究了试样原始态与时效后的组织与硬度。结果表明,AFAM 7050铝合金由等轴、细小晶粒的再结晶区与其连接区两种形貌交替分布组成,再结晶晶粒平均尺寸大约为3-8μm;时效后晶粒发生了一定程度的长大,晶界出现了平直化现象,并析出了许多第二相,但依旧存在孔洞类缺陷和结合类缺陷;AFAM 7050铝合金厚度方向硬度存在梯度,上表层硬度最小,时效后硬度先增加后减小,最佳时效工艺为120℃/4h预处理+160℃/3h终时效。
The samples of 7050 aluminum alloy were prepared through the advanced friction additive manufacturing process（AFAM）. The microstructure and hardness for the original and artificial aging samples were investigated by optical microscope,scanning electron microscope and hardness tester. The results show that AFAM 7050 aluminum alloy is composed of equiaxial and tiny recrystallization zone and joining zone. The mean size of equiaxed grains is about 3-8μm. After aging,grains grow up,boundaries of grains come into flat and precipitate the second phase as well as excavations and associative defect still exist. There exists gradient in hardness direction of hardness in AFAM 7050 aluminum alloys. The hardness on the upper surface is least. After aging,the hardness increases at first and then decreases. The best method is 120℃/4 h of preparation and 160℃/3 h final aging.
作者
孙奖
杨滨
东青
刘清贤
SUN Jiang1,YANG Bin1,DONG Qing2,LIU Qing-xian1(1 University of Science and Technology Beijing,Beijing,100083）（2 Advanced Technology and Innovation Institute,331 4th Ave. Kirkland WA 98033)
出处
《世界有色金属》
2018年第6期6-7,共2页
World Nonferrous Metals
