固溶处理及时效对7xxx铝合金组织与性能的影响  

Effects of solution treatment and aging process on microstructure and mechanical properties of 7xxx aluminium alloy

作　　者：戴晓元[1] 夏长清[1] 刘昌斌[1] 古一[1] 

机构地区：[1]中南大学材料科学与工程学院

出　　处：《材料热处理学报》2007年第4期59-63,共5页Transactions of Materials and Heat Treatment

基　　金：国家重点基础研究发展规划项目(2005CB623706)

摘　　要：通过拉伸性能和电导率测试,扫描电镜和透射电镜观察,研究了固溶处理及时效对Al-7.2Zn-2.0Mg-1.2Cu-0.10Sc-0.10Zr合金组织性能的影响。结果表明:合金的最佳固溶工艺为:470℃×120min。经回归再时效处理(RRA)120℃×24h+170℃×1h+120℃×24h处理,合金的抗拉强度为595.8MPa,屈服强度为572.0MPa,伸长率为8.3%,相对电导率为38.4%IACS。The effects of solution treatment and aging process on microstructure and mechanical properties of Al-7.2Zn-2.0Mg-1.2Cu-0.10Sc- 0.10Zr ahoy were investigated by tensile tests, electric conductivity, scanning electron microscopy and transmission electron microscopy. The results show that the suitable solution treatment is solution at 470℃ for 120min. After retrogression and re-ageing treatment （RRA, 120℃ × 24h ＋170℃ × 1h ＋ 120℃ × 24h）, the tensile strength, yield strength, elongation and relative electric conductivity of the studied alloy are 595.8MPa, 572.0MPa, 8.3% and 38.4%IACS, respectively.

关 键 词：超高强铝合金 SC 固溶处理 

分 类 号：TG166.3[金属学及工艺—热处理]