(1. 广东省工业分析检测中心，广州 510650；
2. Australian Centre for Microscopy & Microanalysis, The University of Sydney, Sydney 2006, Australia)
摘 要: 应用透射电镜研究国内外5083铝合金H116态退火组织中第二相的形态和微观结构，观察到三类不同形态和晶体结构的第二相。第一类为具有单斜结构或伪四方结构的板条状η-Al5(Mn,Cr)相，国产5083铝合金组织中该相含量较多；第二类为具有正交结构的棒状Al6(Mn,Fe)相，国产和国外的5083铝合金组织中该相均可见；第三类为具有单斜结构的球状或不规则形状θ-Al45(Mn,Cr)7相，国外5083铝合金组织中该相含量较多，此类单斜结构的θ-Al45(Mn,Cr)7相易产生 或 孪晶和 共轭面。同时，利用Al-Cr二元相图和Al-Mn-Cr三元相图解释了5083铝合金H116态退火组织中第二相的生成机制以及它们的形态对加工性能的影响。
关键字: 5083铝合金；H116加工态；透射电镜；第二相；形态；结构
（1. Guangdong Industrial Analysis and Testing Center, Guangzhou 510650, China;
2. Australian Centre for Microscopy & Microanalysis, The University of Sydney, Sydney 2006, Australia）
Abstract:The morphology and microstructure of the second-phases in a 5083 aluminum alloy with H116 temper condition from both domestic and foreign were investigated by TEM. Three types of the second-phase were observed. The 1st, or lath-shaped style is η-Al5(Mn,Cr) phase with monoclinic or pesuo-tetragonal structure, and is mostly seen in 5083 alloy under H116 temper condition from domestic. The 2nd or rod-shaped style is Al6(Mn,Fe) phase with orthorhombic structure and is observed in both domestic and foreign 5083 aluminum alloy, and the 3rd style is monoclinic Al45(Mn,Cr)7 phase with twin-structure, which is seen only in foreign alloy. The formation of the second- phases in 5083 aluminum alloy was discussed based on Al-Cr binary phase diagram or Al-Mn-Cr triple phase diagram.
Key words: 5083 alloy; H116 temper condition; TEM; second phase; morphology; structure
