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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,研究了固溶处理前的预回复处理(250℃×24 h+300℃×6 h+350℃×6 h+400℃×6 h)对高合金化铝合金Al-13.0Zn-3.16Mg-2.8Cu-0.2Zr-0.07Sr挤压材在T652态组织与性能的影响。结果表明,固溶前的预回复处理降低了位错密度,减小了平均晶粒尺寸(8.764μm vs.4.835μm)和平均晶界角度,显著提高了低角度晶界数目分数(0.410 vs.0.658)和电导率(24.6%ICAS vs.26.3%ICAS),降低了硬度(228.2 HV vs.227.0 HV)、屈服强度(680.3 MPa vs.662.5 MPa)、抗拉强度(714.5 MPa vs.695.5 MPa)和伸长率(7.6%vs.5.6%),提高了抗晶间腐蚀和抗剥落腐蚀性能;定量分析显示,预回复处理轻微降低了合金位错强化、低角度晶界强化和高角度晶界强化的总强化,合金强度的降低主要归因于合金固溶强化和时效沉淀析出相强化的总强化的降低;抗腐蚀性能的提高可以归因于合金低角度晶界数目百分比的提高。
XRD, EBSD, conductivity test, hardness test, tensile test, intergranular corrosion test and exfoliation corrosion test were used to study the effect of pre-treatment before solution treatment (250 ℃ × 24 h + 300 ℃ × 6 h + 350 ℃ × 6 h + 400 ℃ × 6 h) The tensile strength of Al-13.0Zn-3.16Mg-2.8Cu-0.2Zr-0.07Sr extruded alloy with high alloyed aluminum alloy in T652 The Influence of State Organization and Performance. The results show that the pre-solution pre-treatment reduces the dislocation density, decreases the average grain size (8.764μm vs.4.835μm) and the average grain boundary angle, significantly increases the number of low-angle grain boundaries (0.410 vs. 0.658), and conductivity (24.6% ICAS vs. 26.3% ICAS) decreased hardness (228.2 HV vs.. 227.0 HV), yield strength (680.3 MPa vs. .662.5 MPa), tensile strength (714.5 MPa vs. 695.5 MPa) And elongation (7.6% vs.5.6%), improved resistance to intergranular corrosion and exfoliation corrosion; quantitative analysis showed that the pre-recovery treatment slightly reduces the alloy dislocation strengthening, low angle grain boundary strengthening and high angle grain boundary strengthening The reduction of alloy strength is mainly attributed to the decrease of the total strengthening of alloy solution strengthening and aging precipitated phase strengthening. The improvement of corrosion resistance can be attributed to the increase of the percentage of low-angle grain boundaries.