固溶-冷变形-预回复对Al-13.01Zn-3.16Mg-2.8Cu-0.204Zr-0.0757Sr铝合金组织与性能的

发布时间：2018-05-15 01:42

本文选题：Al-Zn-Mg-Cu超高强铝合金 + 预回复　；参考：《材料热处理学报》2017年01期

【摘要】：采用X射线衍射分析(XRD)、电子背散射衍射分析(EBSD)、电导率测试、硬度测试、拉伸试验、晶间腐蚀试验和剥落腐蚀试验,研究了固溶冷变形-预回复对超高强铝合金Al-13.01Zn-3.16Mg-2.8Cu-0.204Zr-0.0757Sr固溶组织、时效及性能的影响。结果表明,预回复对固溶冷变形态下超高强铝合金的性能改善作用不大。相比固溶—冷压缩—固溶—时效和固溶—冷压缩—预回复—固溶—时效工艺,合金在固溶—冷压缩—时效工艺下具有更优秀的平均晶粒尺寸,硬度、低角度晶界比例、抗拉强度、屈服强度和抗晶间腐蚀性能。其中固溶—冷压缩—时效工艺下合金的屈服、抗拉强度达到了683.2 MPa、734.7 MPa,伸长率为6.1%,且晶间腐蚀深度为23.81μm,晶间腐蚀等级为二级。相比另外两种工艺,该工艺下合金屈服强度的贡献主要是来自位错强化和低角度晶界强化。
[Abstract]:X ray diffraction analysis (XRD), electron backscatter diffraction analysis (EBSD), electrical conductivity test, hardness test, tensile test, intergranular corrosion test and exfoliation corrosion test were used to study the effect of solid solution cold deformation pre recovery on the solid solution structure, aging and properties of ultra-high strength aluminum alloy Al-13.01Zn-3.16Mg-2.8Cu-0.204Zr-0.0757Sr. As compared with solid solution cold compression - solid solution - solution - aging and solid solution - cold compression prerecovery - solution aging process, the alloy has a better average grain size, hardness, low angle grain boundary ratio and tensile strength, compared with solid solution - cold compression - pre recovery - solid solution aging process. Yield strength and intercrystalline corrosion properties, among which the yield of alloy under solid solution cold compression aging process is 683.2 MPa, 734.7 MPa, and the elongation is 6.1%, and the intergranular corrosion depth is 23.81 m and intergranular corrosion grade is two. Compared with the other two processes, the contribution of the yield strength of the alloy is mainly from dislocation. Strengthening and low angle grain boundary strengthening.

【作者单位】：江苏大学先进制造与现代技术研究所;
【基金】：江苏大学研究生科研创新计划项目(KYXX_0031) 国家自然科学基金资助(项目号51074079)
【分类号】：TG146.21

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