热机械处理对Al-10.78Zn-2.78Mg-2.59Cu-0.22Zr-0.047Sr铝合金固溶时效态组织及力学性能
发布时间：2019-04-25 20:17
【摘要】：以固溶-时效和热机械处理(TMT)(固溶-过时效-热压缩)-固溶-时效加工的超高强铝合金Al-10.78Zn-2.78Mg-2.59Cu-0.22Zr-0.047Sr为实验对象,分别采用电子背散射衍射(EBSD)、X射线衍射(XRD)、硬度测试和拉伸试验研究合金组织晶粒晶界特征分布、内部的位错密度和力学性能,并定量计算位错强化和晶界强化值。结果表明:热机械处理对合金晶粒细化影响不显著,平均晶粒尺寸从7.30μm减小至6.04μm,晶界角度从21.45?下降到21.04?,小角度晶界比例从0.588下降到0.546;TMT使峰时效硬度从2146 MPa(120℃/48 h)提高到2268 MPa(100℃/48h),但对强度影响较小,二者屈服强度均为600 MPa左右,拉伸断口均为沿晶和撕裂混合断裂。合金分别经固溶及TMT-固溶后,晶界位错密度均为零,TMT使位错强化与晶界强化的总强化从58.8 MPa下降到57.4 MPa。
[Abstract]:The ultra-high strength aluminum alloy Al-10.78Zn-2.78Mg-2.59Cu-0.22Zr-0.047Sr processed by solution-aging and thermo-mechanical treatment of (TMT) (solid solution-over-aging-hot compression)-solid solution-aging was used as the experimental object. Electron backscattering diffraction (EBSD),) X-ray diffraction (XRD),) hardness test and tensile test were used to study the grain boundary characteristic distribution, dislocation density and mechanical properties of the alloy grains, and the dislocation strengthening and grain boundary strengthening values were calculated quantitatively. The results show that the effect of thermal mechanical treatment on grain refinement is not significant. The average grain size decreases from 7.30 渭 m to 6.04 渭 m and grain boundary angle from 21.45? The grain boundary ratio of small angle decreased from 0.588 to 0.546; TMT increases the peak aging hardness from 2146 MPa (120 鈩，
本文编号：2465429
[Abstract]:The ultra-high strength aluminum alloy Al-10.78Zn-2.78Mg-2.59Cu-0.22Zr-0.047Sr processed by solution-aging and thermo-mechanical treatment of (TMT) (solid solution-over-aging-hot compression)-solid solution-aging was used as the experimental object. Electron backscattering diffraction (EBSD),) X-ray diffraction (XRD),) hardness test and tensile test were used to study the grain boundary characteristic distribution, dislocation density and mechanical properties of the alloy grains, and the dislocation strengthening and grain boundary strengthening values were calculated quantitatively. The results show that the effect of thermal mechanical treatment on grain refinement is not significant. The average grain size decreases from 7.30 渭 m to 6.04 渭 m and grain boundary angle from 21.45? The grain boundary ratio of small angle decreased from 0.588 to 0.546; TMT increases the peak aging hardness from 2146 MPa (120 鈩，
本文编号：2465429
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