7A55铝合金厚板的微观组织和性能不均匀性

发布时间：2018-05-21 18:06

本文选题：A铝合金 + 厚板　；参考：《中南大学学报(自然科学版)》2015年08期

【摘要】：采用金相显微镜、扫描电镜、透射电镜、织构分析、硬度、电导率、拉伸测试等实验手段研究7A55铝合金厚板T6态微观组织与性能沿厚度方向的演变规律。研究结果表明:在板材的厚度方向上,板材的微观组织和硬度、电导率、强度、织构等存在不均匀性。从板材表层到心部,其再结晶分数依次降低,残余第2相体积分数、电导率和强度依次升高,表层硬度比心部的高,1/4层的硬度最高。心部含有最多的轧制型织构为铜织构{112}?111?,黄铜织构{011}?211?和S织构{123}?634?,表层含有最多的再结晶织构为{001}?100?。轧制型织构具有更大的泰勒因子M,对强度贡献更大,表层的再结晶严重削弱了其力学性能,影响各层力学性能差异的主要因素是再结晶及织构。
[Abstract]:Metallographic microscope, scanning electron microscope, transmission electron microscope, texture analysis, hardness, electrical conductivity and tensile test were used to study the evolution of microstructure and properties of 7A55 aluminum alloy thick plate T6 along the thickness direction. The results show that the microstructure, hardness, conductivity, strength and texture of the sheet are not uniform in the thickness direction. The recrystallization fraction decreased and the volume fraction of residual second phase, electrical conductivity and strength increased from the surface to the center of the plate. The hardness of the surface layer was the highest in a quarter of a layer higher than that in the center. The most rolling texture in the core is copper texture ({112}) 111g, brass texture ({011}) 211? And S texture {123} Li 634, the surface layer containing the most recrystallization texture is {001} ~ (100). The rolling texture has larger Taylor factor M, which contributes more to the strength. The recrystallization of the surface layer seriously weakens its mechanical properties. The main factors affecting the difference of mechanical properties of each layer are recrystallization and texture.
【作者单位】：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;江苏科技大学材料科学与工程学院江苏省先进焊接技术重点实验室;
【基金】：国家重点基础研究发展规划(“973”计划)项目(2012CB619500)~~
【分类号】：TG146.21

【参考文献】