不同浓度富Fe相粒子对Al-Mg-Si-Cu系合金弯边性能的影响

发布时间：2018-06-28 23:09

本文选题：Al-Mg-Si-Cu合金 + 富Fe相　；参考：《金属学报》2016年03期

【摘要】：通过弯边变形,拉伸实验,OM,SEM和TEM观察等手段研究了不同浓度富Fe相粒子对Al-Mg-Si-Cu系合金板材弯边性能的影响规律.结果表明,随着富Fe相浓度增加,合金板材沿纵横向的弯边性能存在较大差异,不含富Fe相粒子的合金板材沿2个方向弯边变形180°后外表面粗糙度增加,处于中等浓度(含0.2%Fe)时沿2个方向弯边变形后均具有优异的外表面质量,但是随着富Fe相浓度的进一步增加(至0.5%Fe),合金板材沿横向弯边变形后在外表面出现微裂纹.虽然富Fe相粒子浓度增加对合金板材纵横向延伸率影响不大,但是拉伸断口、弯边和拉伸断裂后的侧表面组织均表明,不含富Fe相的合金板材弯边变形后外表面粗糙度增加与剪切带组织密切相关,而含有较高浓度富Fe相粒子的合金板材弯边变形后外表面出现的微裂纹与粗大富Fe相粒子的尺寸、形态以及分布状态密切相关.此外,根据不同浓度富Fe相粒子与合金弯边性能间的定量关系,提出了合金弯边变形后外表面粗糙度增加和微裂纹形成的模型示意图.
[Abstract]:The influence of Fe rich particles on the bending properties of Al-Mg-Si-Cu alloy sheet was studied by means of bending deformation, tensile test, SEM and TEM observation. The results show that with the increase of Fe rich phase concentration, the bending properties of alloy plates along the longitudinal and transverse direction are different, and the outer surface roughness of alloy plates without Fe rich particles is increased after deformation of 180 掳in both directions. When the alloy is in medium concentration (including 0.2), it has excellent external surface quality after bending in both directions. However, with the further increase of Fe rich phase concentration (to 0.5), there are microcracks on the outer surface of the alloy plate after deformation along the lateral bending edge. Although the increase of Fe rich phase particle concentration has little effect on the longitudinal and transverse elongation of the alloy sheet, the tensile fracture, the bending edge and the lateral surface structure after tensile fracture all show that, The increase of the outer surface roughness of the alloy sheet without Fe rich phase is closely related to the microstructure of the shear band, but the microcracks and the size of the coarse Fe rich phase particles appear on the outer surface of the alloy sheet without Fe rich phase after bending deformation. Morphology and distribution are closely related. In addition, according to the quantitative relationship between Fe rich phase particles with different concentrations and the bending properties of the alloy, a model diagram of the increase of surface roughness and the formation of micro-cracks after deformation of the alloy is presented.
【作者单位】：北京科技大学新金属材料国家重点实验室;
【基金】：国家高技术研究发展计划项目2013AA032403 国家自然科学基金项目51571023和51301016 中央高校基本科研业务费项目FRFTP-15-051A3 北京实验室项目FRF-SD-B-005B资助~~
【分类号】：TG146.21

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