微量Sc对Al-8.0Zn-1.6Mg-1.7Cu合金厚板组织与性能不均匀性的影响

• 作 者: 陈龙 邓运来 范世通 肖宇宁
• 机 构: 中南大学材料科学与工程学院,有色金属材料科学与工程教育部重点实验室,
• 出 处: 热加工工艺
• 发表日期: 2017年04期
• 关键词: 不均匀性 Sc 再结晶组织 心部 剥落腐蚀 铝合金板 透射电镜 第二相 金相显微镜 力学性能

采用金相显微镜、扫描电镜、透射电镜、常温拉伸和电子背散射衍射技术等研究了Al-Zn-Mg-Cu-Sc厚板(35 mm)组织与性能沿厚度方向的变化规律。结果表明:板材表层抗拉强度与心部相差2.5%,力学性能分布较均匀;板材表层与心部的再结晶存在显著的差异,表层再结晶比例达65%,心部仅为4.1%;板材的抗剥落腐蚀能力存在不均匀性,表层的抗剥落腐蚀能力小于心部。

The microstructure and properties of Al-Zn-Mg-Cu-Sc slab (35 mm) along the thickness direction were studied by means of optical microscope, scanning electron microscopy, transmission electron microscopy, room temperature tensile and electron backscatter diffraction techniques. The results show that the tensile strength of the sheet is 2.5% less than that of the core, and the distribution of mechanical properties is even. The recrystallization of the surface and the core of sheet is significantly different. The proportion of surface recrystallization reaches 65% and the center of the sheet is only 4.1% Of the anti-stripping corrosion of non-uniformity, the surface anti-spalling corrosion is less than the heart.