The integrity and regularity of pore morphology play an important role in determining the mechanical properties of the metallic foam materials.The conventional methods on refining pore morphology are mainly focused on the optimization of fabrication techniques,however,they are usually inconvenient and complicated.Recently,incorporating nano reinforcement is considered to be a suitable way to fabricate metallic composite foams accompanied by optimized pore morphology and enhanced mechanical proper-ties.In this work,through a facile and rapid powder metallurgy foaming method,the aluminum-silicon(Al-Si)alloy composite foams reinforced by graphene nanosheets(GNSs)are successfully fabricated.The microstructure analyses reveal that,for the Al-Si alloy foams incorporating the GNSs(GNSs/Al-Si com-posite foams),the pore size is transformed to be smaller,the pore size distributions become more ho-mogeneous and the pore shape is also refined to a regular and roundish state.Meanwhile,the shape of Si precipitates is found transforming from an irregular long strip(length of-20 μm,width of～5 μm)to a fine particle state(diameter of～5 μm).Moreover,the compressive testing results show that,the 0.4 wt％GNSs/Al-Si composite foams own the optimal compression stress of 11.7±0.5 MPa,plateau stress of 10.0 士 1.0 MPa and energy absorption capacity of 6.8±0.7 MJ/m3,which have improvement of 58.1％,53.8％and 51.1％in comparison with the Al-Si alloy foams counterpart,respectively.The present find-ings may pave a new way for developing new generation of metallic composite foams that with stable microstructure and excellent mechanical performance.

Weiting Li;Xudong Yang;Kunming Yang;Chunnian He;Junwei Sha;Chunsheng Shi;Yunhui Mei;Jiajun Li;Naiqin Zhao

Tianjin Key Laboratory of Composite and Functional Materials,School of Materials Science and Engineering,Tianjin University,Tianjin 300350,China;Sino-European Institute of Aviation Engineering,Civil Aviation University of China,Tianjin 300300,China;Collaborative Innovation Center of Chemical Science and Engineering,Tianjin University,Tianjin 300350,China;Tianjin Key Laboratory of Advanced Joining Technology,School of Materials Science and Engineering,Tianjin University,Tianjin 300350,China

材料科学技术（英文版）

[1]Weiting Li;Xudong Yang;Kunming Yang;Chunnian He;Junwei Sha;Chunsheng Shi;Yunhui Mei;Jiajun Li;Naiqin Zhao-.Simultaneously optimizing pore morphology and enhancing mechanical properties of Al-Si alloy composite foams by graphene nanosheets)[J].材料科学技术（英文版）,2022(06):60-70

mogeneous,roundish

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