有色金属科学与工程2025，Vol.16Issue(4)：574-584,11.DOI:10.13264/j.cnki.ysjskx.2025.04.009
Al-xZn-2.6Mg合金的显微组织演变与力学性能
Microstructural evolution and mechanical properties of Al-xZn-2.6Mg alloy
刘海江 1王日初 2林海涛 3彭超群 1曾庆华 3彭翔 1蔡志勇 2史贵山 3许开春3
作者信息
- 1. 中南大学,材料科学与工程学院,长沙 410083
- 2. 中南大学,材料科学与工程学院,长沙 410083||中南大学,轻质高强结构材料重点实验室,长沙 410083
- 3. 西南铝业(集团)有限责任公司,重庆 401326
- 折叠
摘要
Abstract
Al-xZn-2.6Mg(x=6.8,7.1,7.4)alloys were designed based on the 7A62 aluminum alloy.The effects of Zn content on the microstructure and mechanical properties of as-cast,hot-rolled and solution-aged alloys were investigated,and their aging precipitation behavior was also analyzed.The results show that with the increase of Zn content from 6.8％to 7.4％,the content and size of secondary phase in the as-cast alloy increased,and its distribution tended to be mesh-like.The average grain size of the hot-rolled alloys decreased from 20.8 μm to 9.9 μm,and the average misorientation difference of grain boundaries and the proportion of the large angle grain boundaries increased gradually.After solution and aging treatment,the volume fraction of η'-MgZn2 phase precipitated in the alloy was significantly increased,but its size was basically constant.The mechanical properties of 7.4％Zn alloy were the best,with the yield strength,tensile strength,and elongation reaching 570.9,616.8 MPa and 9.7％,respectively,due to the joint action of fine grain strengthening,solid solution strengthening and precipitation strengthening.关键词
7A62合金/热轧/时效处理/析出相/力学性能Key words
7A62 alloy/hot rolling/aging treatment/precipitated phase/mechanical property分类
矿业与冶金引用本文复制引用
刘海江,王日初,林海涛,彭超群,曾庆华,彭翔,蔡志勇,史贵山,许开春..Al-xZn-2.6Mg合金的显微组织演变与力学性能[J].有色金属科学与工程,2025,16(4):574-584,11.
