压缩大变形对7085铝合金固溶-时效组织性能的影响  

Effect of large compression deformation on microstructure and properties of 7085 aluminum alloy after solid solution-aging treatment

作　　者：许晓静[1] 朱金鑫[1] 杨帆[1] 丁清[1] 汪成松 黄晶[1] 

机构地区：[1]江苏大学先进制造与现代装备技术工程研究院,江苏镇江212013

出　　处：《材料热处理学报》2016年第12期36-41,共6页Transactions of Materials and Heat Treatment

基　　金：江苏省工业科技支撑计划项目(BE2008118);江苏大学"拔尖人才培养工程基金"(1211110001);江苏省高校研究生科研创新计划项目(CXLX12_0620)

摘　　要：采用拉伸试验、X射线衍射分析(XRD)、电子背散射衍射分析(EBSD)、晶间腐蚀试验和剥落腐蚀试验等方法,研究了压缩大变形(20%压缩、45%压缩)对7085铝合金固溶-时效组织性能的影响。结果表明:压缩大变形能提高合金的拉伸强度(从440.9 MPa分别提升到481.2 MPa和514.5 MPa),显著细化晶粒尺寸(平均晶粒尺寸从31.580μm分别降低到7.414μm和6.469μm),压缩大变形还能提高合金的抗晶间腐蚀性能和抗剥落腐蚀性能,定量分析显示,压缩大变形处理显著提高了位错强化和小角度强化的总强化。Effects of large compression deformation（20% and 45% compression） on microstructure and properties of 7085 aluminum alloy after solid solution-aging treatment were investigated by tensile test,XRD and EBSD technique,inter-granular and exfoliation corrosion resistance experiments. The results show that large compression deformation treatment of the alloy after solid solution can improve the yield strength（from 440. 9 MPa up to 481. 2 MPa and 514. 5 MPa,respectively） and refine the grain size（the average grain size dropped from31. 580 μm to 7. 414 μm and 6. 469 μm,respectively）. In addition to,large compression deformation enhances inter-granular corrosion performance and exfoliation corrosion performance of the alloy. Quantitative analysis shows that large compression deformation can increase the sum of dislocation strengthening and low-angle grain boundary strengthening significantly.

关 键 词：7085铝合金 压缩大变形量 屈服强度 位错强化 小角度晶界强化 

分 类 号：TG146.2[一般工业技术—材料科学与工程]