摘要
采用球磨和真空热压烧结结合的工艺制备石墨烯增强铝基(Gr/Al)复合材料,研究不同粒径铝粉混合对复合材料微观组织和力学性能的影响。结果表明,利用球体最密堆积原理设计的多粒径铝粉混合,M_(1)(1μm∶10μm按1∶1.5混合)和M_(2)(10μm与100μm按1∶1.5混合)的致密度均高于单一粒径的试样(S),M_(2)致密度达到96.2%。M_(1)试样抗拉强度和伸长率相较于S试样有所降低,M_(2)试样抗拉强度和伸长率均提高,其中伸长率提升31.8%。多粒径混合可促进分散小粒径铝粉和石墨烯,有效降低孔隙率,在减少原始颗粒界面的同时增加裂纹扩展路径,大尺寸粒径颗粒的加入使得复合材料的塑性大幅提升。
Effects of Al powders with different particle sizes on the microstructure and mechanical properties of graphene reinforced aluminum matrix(Gr/Al)composites fabricated by ball milling and vacuum hot-pressing sintcring wcrc invcstigatcd.Thc rcsults indicate that thc rclativc density of M_(1)(1μm:10μm=1:1.5 mixture)and M_(2)(10μm:100μm=1:1.5 mixture)of multi-size aluminum powder mixture designed by sphere densest packing principle is higher than that of S specimen(10μm)with single size,where the density of M2 reaches 96.2%.The tensile strength and elongation of M_(1) are lower than that of S specimen,while those of M_(2) are increased,where the elongation is enhanced by 31.8%.The multi-size mixture can effectively disperse small aluminum powders and graphene,reduce the porosity,and add the crack propagation path with the reduction of the original particle interface,consequently resulting in the enhanced plasticity.
作者
解双
张宇博
刘嘉鸣
李廷举
Xie Shuang;Zhang Yubo;Liu Jiaming;Li Tingju(School of Materials Science and Engineering,Dalian University of Technology;Key Laboratory of Solidification Control and Digital Preparation Technology(Liaoning Province);Ningbo Institute of Dalian University of Technology)
出处
《特种铸造及有色合金》
CAS
北大核心
2023年第3期330-335,共6页
Special Casting & Nonferrous Alloys
基金
国家自然科学基金资助项目(51971048)
大连理工大学重点实验室科研专题资助项目(DUT20LAB141)。
