航空材料学报2016，Vol.36Issue(6)：15-22,8.DOI:10.11868/j.issn.1005-5053.2016.6.003
7085-T651铝合金特厚板组织性能的不均匀性
Inhomogeneity of Microstructure and Properties of 7085-T651 Aluminum Alloy Extra-thick Plate
摘要
Abstract
Inhomogeneity of microstructure and properties of 7085-T651 aluminum alloy extra-thick plate were investigated by tensile properties, exfoliation corrosion, optical microscopy(OM), composition analysis, scanning electron microscopy(SEM),differential scanning calorimetry ( DSC) and transmission electron microscopy ( TEM) . The results show that the microstructure, tensile property and exfoliation corrosion in different layers of 7085-T651 aluminum alloy of 110 mm thick are inhomogeneous. For the 1/4 thickness layer, the tensile strength is the minimum, 540 MPa, and the resistance to exfoliation corrosion of this layer is the worst, with exfoliat-ion corrosion classification of EB. For the core layer, the tensile strength is the maximum, 580 MPa. The resistance to exfoliation cor-rosion of the surface layer is the best, with exfoliation corrosion classification of EA. For the 1/4 thickness layer, it has the largest re-crystallized fraction up to about 47. 7% and the grain size is about 105 μm;there are equilibrium phase particles precipitated on grain boundaries or within grains;the size of aging precipitates is small; and thus both mechanical properties and resistance to exfoliation corrosion are the worst. For the core layer, it has the smallest recrystallized fraction of about 14. 8% and there are a large amount of sub-grains; the fraction of residual phase Al7 Cu2 Fe almost reaches up to about 1. 43%; the size of the equilibrium phase on grain boundaries, the size of aging precipitates and the width of PFZ are large, and therefore good mechanical properties and bad resistance to exfoliation corrosion are obtained.关键词
7085铝合金/特厚板/不均匀性/无沉淀析出带Key words
7085 aluminum alloy/extra-thick plate/inhomogeneity/precipitate free zone分类
矿业与冶金引用本文复制引用
李承波,何克准,宋丰轩,刘胜胆,曹盛强,张新明..7085-T651铝合金特厚板组织性能的不均匀性[J].航空材料学报,2016,36(6):15-22,8.基金项目
国家重点基础研究计划项目(2012CB619501) （2012CB619501）
国家国际科技合作专项项目(2014DFA50210) （2014DFA50210）
