预回复对固溶-T652处理超高强铝合金挤压材组织与性能的影响

发布时间：2018-01-16 04:09

本文关键词：预回复对固溶-T652处理超高强铝合金挤压材组织与性能的影响　出处：《中国有色金属学报》2015年11期 　论文类型：期刊论文

【摘要】：研究预回复对固溶-T652处理超高强铝合金Al-12.5Zn-3.6Mg-1.2Cu-0.2Zr-0.06Sr挤压材组织与性能的影响。结果表明:合金在固溶-T652处理前预回复处理((250℃,24 h)+(300℃,6 h)+(350℃,6 h)+(400℃,6 h))能明显提高合金的位错密度,显著细化合金晶粒(平均晶粒尺寸从11.14μm下降到5.25μm),降低晶界平均角度(从17.81°下降到12.57°),提高低角度晶界所占比例(由66.2%提高到76.4%),但硬度和强度略有下降。预回复处理能显著改善合金的抗晶间腐蚀性能,最大晶间腐蚀深度由247.7?m降为138.0?m。定量分析结果表明:合金强度的降低可归因于时效沉淀强化效果的降低;抗腐蚀性能的提高可归因于低角度晶界比例的提高和晶界析出相的粗化。
[Abstract]:Study on the solution of pre recovery treatment of -T652 ultra high strength Aluminum Alloy Al-12.5Zn-3.6Mg-1.2Cu-0.2Zr-0.06Sr extrusion and properties of material organization effect. The results show that the alloy in -T652 solution treatment pre recovery treatment (250 C, H (24) + (300 C, 6 h) + (350 C, 6 h) + (400 C, 6 h)) could significantly increase the dislocation density of the alloy, refine alloy grains (the average grain size decreased from 11.14 m to 5.25 m), reduced the average angle grain boundary (down from 17.81 degrees to 12.57 degrees), increase the proportion of low angle grain boundaries (increased from 66.2% to 76.4%), but the hardness and strength slightly. Corrosion resistance of the pre recovery treatment can significantly improve the alloy's resistance to intergranular, intergranular corrosion depth maximum by 247.7? M to 138? M. quantitative analysis results showed that the lower the strength of the alloy can be attributed to reduced precipitation strengthening effect; corrosion resistance can be attributed to the increased proportion of low angle grain boundaries. The coarsening of the precipitates of high and grain boundaries.

【作者单位】：江苏大学先进制造与现代装备技术工程研究院;
【基金】：江苏省工业科技支撑计划项目(BE2008118) 江苏大学优秀青年学术骨干培育专项基金资助项目(1211110001) 江苏省高校研究生科研创新计划项目(CXLX110563) 江苏高校优势学科建设工程项目
【分类号】：TG166.3;TG146.21
【正文快照】： Al-Zn-Mg-Cu系超强铝合金由于具有比强度高、韧性好、制造成本低等优良的综合性能,已作为轻质高强结构材料广泛应用于航空领域,成为该领域最重要的结构材料之一[1-6]。近几十年来,对超强铝合金的发展也愈来愈重视,开发高强高韧新型铝合金,获得低角度晶界特征和不连续晶界析出

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