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,研究了固溶处理后的预压缩变形对超高强铝合金Al-13.01Zn-3.16Mg-2.8Cu-0.20Zr-0.075Sr挤压材组织与性能的影响。研究表明,对比未经预变形处理的合金,采用变形量分别为2%和10%的预变形处理,合金位错密度分别提高了1.20×1014和1.35×1014m-2,屈服强度分别提高了24.1和29.5 MPa,抗拉强度分别提高了24.9和30.3 MPa和硬度分别提高了HV 12.2和HV 21.7,同时发现变形量越大,提升效果越明显;同时2%预变形提高了合金抗晶间腐蚀性能。定量分析显示,预变形处理明显提高了合金位错强化、低角度晶界强化和高角度晶界强化的总强化,合金强度的增加主要因为低角度晶界与晶粒内部位错导致的强化,时效沉淀强化也可能是强度增加原因之一。合金抗晶间腐蚀性能的提高因为合金内部低角度晶界比例和位错密度的增加。
Effects of axial pre-compression deformation on microstructures and properties of Al-13. 01Zn-3. 16Mg-2.8Cu-0.20Zr-0. 0755r extruded materials were investigated by tensile and hardness tests, X-ray diffraction （XRD） and electron backscattered diffraction （EBSD） analysis, inter-granular and exfoliation corrosion resistance experiments. The results showed that the pre-deformation could increase the dislocation density, yield strength, ultimate tensile strength and hardness with the increase of the amount of deforma- tion. The density of dislocation under 2% and 10% pre-deformation increased by 1.20 x 1014 andl. 35 x 10TM m-2 respectively; the yield strength increased by 24.1 and 29.5 MPa respectively; the ultimate tensile strength increased by 24.9 and 30.3 MPa and the hardness increased by HV 12.2 and HV 21.7 respectively. Quantitative analysis demonstrated that the pre-deformation strengthening came from dislocation strengthening, low angle grain boundaries strengthening and high angle grain boundary strengthening obviously, and aging strengthening could be another reason. Also 2% pre-deformation treatment could improve the intergranular corrosion resistance of the alloy, which could be attributed to the increase of the proportion of the low angle grain boundaries and the dislocation density.
出处
《稀有金属》
EI
CAS
CSCD
北大核心
2016年第12期1193-1199,共7页
Chinese Journal of Rare Metals
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项目(1211110001)
江苏省高校研究生科研创新计划项目(SJLX_0460)资助
