喷射成形7055铝合金热处理工艺与力学性能的研究  

Study on Heat-treatment Technology and Mechanical Properties of Spray Formed 7055 Aluminum Alloy

作　　者：侯小虎[1] 张秀云[1] 郭强[1] 王莹莹[1] 裴杰[1] 

机构地区：[1]内蒙古工业大学材料科学与工程学院,内蒙古呼和浩特010051

出　　处：《热加工工艺》2008年第12期5-7,11,共4页Hot Working Technology

基　　金：内蒙古自治区高等学校科学研究资助项目(NJ05046);内蒙古工业大学重点研究资助项目(ZD200511)

摘　　要：主要研究了喷射成形7055铝合金经过反挤压成型以及热处理后的金相显微组织和力学性能。对挤压态合金进行固溶处理和时效处理后得到了时效硬化曲线并进行了力学性能测试。结果显示:480℃×2h的固溶制度为最佳固溶制度;通过测试硬度值确定最佳单级时效制度为120℃×18h,其硬度可达209HV,抗拉强度为692.12MPa,伸长率为3%。为了进一步提高该合金的伸长率,又对固溶处理件进行双级时效处理(120℃×3h+160℃×4h),其硬度为205HV,抗拉强度为683MPa,伸长率为9.5%。The microstructure and mechanical properties of spray formed 7055 aluminum alloy were studied by the indirect extrusion and heat treatment. The aging hardening curves of the alloy as-extruded after solid-solution and aging treatment were obtained, and the mechanical properties were tested. The results show that solid-solution at 480 ℃ for 2 h and one step aging treatment at 120 ℃ for 18 h are best, its microhardness is 209 HV, tensile strength is 692.12MPa, elongation is 3%. In order to improve further the elongation of the alloy, the alloy was treated by two step aging（120 ℃×3 h ＋ 160 ℃ × 4h）. The microhardness is 205 HV, the tensile strength is 683MPa, the elongation is 9.5%.

关 键 词：喷射成形 超高强度铝合金 固溶处理 时效处理 

分 类 号：TG146.2[一般工业技术—材料科学与工程]