喷射成形Al-Zn-Mg-Cu-Zr系合金热处理工艺研究  

Heat Treatment Process of Spray-Forming Ultrahigh Strength Al-Zn-Mg-Cu-Zr Alloys

作　　者：周娟[1] 肖于德[1] 张林林[1] 黎文献[1] 

机构地区：[1]中南大学材料科学与工程学院,湖南长沙410083

出　　处：《金属热处理》2006年第6期45-48,共4页Heat Treatment of Metals

基　　金：国防科工委军工科研项目(MKPT-05-002)

摘　　要：采用硬度、力学性能测试,金相、扫描电镜、透射电镜观察,X射线衍射分析,研究了不同固溶及时效处理条件下喷射成形A l-7.61Zn-3.57Mg-1.79Cu-0.25Zr合金的力学性能和显微组织结构。结果表明,该喷射成形合金经挤压后基体组织细小均匀,固溶温度达490℃时,合金晶粒明显长大,出现过烧现象。合金适宜的固溶时效工艺为:480℃×60 m in+120℃×28 h。在此条件下,合金的抗拉强度σb、屈服强度σ0.2、伸长率δ、布氏硬度分别为674 MPa、601 MPa、10.6%和173 HB。合金的断裂形式为微孔聚集韧性断裂。An Al-7.61Zn-3.57Mg-1.79Cu-0. 25Zr ultrahigh strength aluminum alloy was prepared by spray-forming technology. Its mechanical properties and microstructure under different heat treatment conditions were investigated by hardness and tensile test, OM,SEM,TEM observations and XRD analysis. The results show that the main microstructure is fine and homogeneous in the as-extrude alloy. The size of grains increases obviously when the solid-solution treatment temperature is up to 490℃. The suitable solution and single-ageing treatment of the alloy is solution treatment at 480℃for 60 min, then aging at 120℃ for 28 h. Under this heat treatment condition, tensile strength, yield strength, hardness and elongation of the alloy are 674 MPa,601 MPa, 10. 6% and 173 HB, respectively. The is micro-porous aggregation toughness fracture. fracture mechanism of the alloy is micro-porous aggregation toughness fracture.

关 键 词：超高强铝合金 喷射成形 热处理 微观组织 

分 类 号：TG146.2[一般工业技术—材料科学与工程]