AA 7055铝合金板材的微观组织与力学性能
Microstructure and Mechanical Property of Aluminum Alloy Plate AA 7055
查看参考文献15篇
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文摘
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研究AA 7055-T7751板材不同厚度层的力学性能,并采用电子背散射衍射(EBSD)、透射电子显微镜(TEM)、小角度X射线散射(SAXS)等分析技术研究板材不同厚度层的微观组织。结果表明:从板材表层到厚度中心,再结晶程度从69%下降到19.1%,亚晶粒尺寸从10 µm减小到2 µm;板材厚度中心主要为轧制型织构,远离中心层其含量逐渐减少,板材表层主要为剪切型织构;板材主要强化相为盘状η'相,其盘面半径为3.7 nm,厚度为1 ~3 nm,与基体的共格应变约为0.0133;板材不同厚度层沿轧制方向的拉伸屈服强度近似呈线性变化:σ_y = -38.7S + 604.8(0≤S≤1)。 |
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其他语种文摘
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Through-thickness microstructure and mechanical property of AA 7055-T7751 aluminum alloy plate were investigated by using electron backscattered diffraction(EBSD),transmission electron microscope(TEM) and small angle X-ray scattering(SAXS).The results indicate an inhomogeneous distribution of microstructure through the thickness.The degree of recrystallization decreases gradually from 69% to 19.1%,as deepening from the surface to the center of the plate.The size of subgrains decreases from 10 µm at the surface to around 2 µm at the center.Strong texture of rolling type is observed near the center but the intensity decreases gradually as nearing the surface and the shear texture becomes the dominant.High density of plate-like η' phases are observed in the alloy, indicating the sufficient precipitation.η' precipitates of this condition are around 3.7 nm in radius, 1-3 nm in thickness and are found coherent with the Al matrix with a coherent strain of 0.0133,showing a strong strengthening effect.The heterogeneity in grain scale does not influence the distribution and the morphology of precipitates.The yield strength(L direction) varies linearly along the thickness direction of the plate,fiitting an equation of σ_y = -38.7S + 604.8(0≤S≤1).The variation of yield strength is related to the heterogeneity of grain structure. |
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来源
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航空材料学报
,2017,37(5):7-14 【核心库】
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DOI
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10.11868/j.issn.1005-5053.2016.000176
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关键词
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铝合金
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微观组织
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屈服强度
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电子背散射衍射
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地址
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中国航发北京航空材料研究院, 北京市先进铝合金材料及应用工程技术研究中心, 北京, 100095
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哈尔滨工业大学材料科学与工程学院, 哈尔滨, 150001
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语种
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中文 |
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文献类型
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研究性论文 |
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ISSN
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1005-5053 |
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学科
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金属学与金属工艺 |
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文献收藏号
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CSCD:6097836
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