Selective laser melting(SLM)is an emerging layer-wise additive manufacturing technique that can generate complex components with high performance.Particulate-reinforced aluminum matrix composites(PAMCs)are important m...Selective laser melting(SLM)is an emerging layer-wise additive manufacturing technique that can generate complex components with high performance.Particulate-reinforced aluminum matrix composites(PAMCs)are important materials for various applications due to the combined properties of Al matrix and reinforcements.Considering the advantages of SLM technology and PAMCs,the novel SLM PAMCs have been developed and researched in recent years.Therefore,the current research progress about the SLM PAMCs is reviewed.Firstly,special attention is paid to the solidification behavior of SLM PAMCs.Secondly,the important issues about the design and fabrication of high-performance SLM PAMCs,including the selection of reinforcement,the influence of parameters on the processing and microstructure,the defect evolution and phase control,are highlighted and discussed comprehensively.Thirdly,the performance and strengthening mechanism of SLM PAMCs are systematically figured out.Finally,future directions are pointed out on the advancement of high-performance SLM PAMCs.展开更多
Liquid-solid phase separation of permalloy in liquid Mg results in selectively dissolved Ni,which provides a unique opportunity for the design of immiscible heterogeneous composite materials and the comprehensive meta...Liquid-solid phase separation of permalloy in liquid Mg results in selectively dissolved Ni,which provides a unique opportunity for the design of immiscible heterogeneous composite materials and the comprehensive metal recycling of permalloy scraps.A guideline of the alloy design for the liquid-solid phase separation system was proposed.The effects of immersion temperature and time on the Ni extraction were studied by an experimental method.The diffusion behavior of Ni from the permalloy to liquid Mg and the microstructure evolution in the permalloy during the liquid-solid phase separation were discussed.The results show that the Ni in the permalloy was quickly extracted into the liquid Mg and formed an Mg-Ni alloy,while the other components such as Fe,Co,and Mn were held back in the phase-separated permalloy.The phase-separated permalloy with the solidified Mg exhibits a three-dimensional(3D)Fe/Mg bicontinuous composite structure.Furthermore,simple treatments were carried out for the reaction products such as the Fe/Mg bicontinuous composite and the Mg-Ni alloy,and the recycling strategies for functionalization of these treated reaction products were provided.A 3D porous Fe-based alloy with electromagnetic interference(EMI)shielding efficiency of 52 dB can be obtained if Mg is removed from the Fe/Mg bicontinuous composite.Instead of the complete separation of pure Ni from the recycled Mg-Ni alloy by vacuum distilling,the Mg-Ni alloy can be enriched into Mg2 Ni as an initial hydrogen storage material.展开更多
Metallic-glass-crystal composites of Cu_(47.5)Zr_(47.5)Al_(5)and Cu_(10)Zr_(7)-reinforced Cu_(46.5)Zr_(48)Al_(4)Nb_(1.5)nanocrystalline materials are obtained by flash-annealing of metallic-glass ribbons.In situ high-...Metallic-glass-crystal composites of Cu_(47.5)Zr_(47.5)Al_(5)and Cu_(10)Zr_(7)-reinforced Cu_(46.5)Zr_(48)Al_(4)Nb_(1.5)nanocrystalline materials are obtained by flash-annealing of metallic-glass ribbons.In situ high-energy X-ray diffraction reveals the deformation mechanism of the alloys upon tensile loading.For the composites and nanocrystalline materials,a small remaining amount of the metallic glass and/or the presence of the Cu_(10)Zr_(7)phase significantly increase the value of yield stress while maintaining good tensile ductility.In general,the obtained materials exhibit a reversible martensitic transformation(MT)between the B_(2)CuZr and B19′/B33 phases during tensile loading and unloading.However,the reversibility of MT depends on the alloy composition,crystalline phases,and the number of(un)loading cycles.Serrated-like fluctuations on tensile stress-strain curves and a sign of twinning in the Cu_(10)Zr_(7)crystals are found after yielding in the Cu_(10)Zr_(7)-reinforced Cu_(46.5)Zr_(48)Al_(4)Nb_(1.5)nanocrystalline materials.Electrochemical measurements show that Cu_(46.5)Zr_(48)Al_(4)Nb_(1.5)nanocrystalline material has good corrosion resistance in NaCl and H_(2)SO_(4)solutions,even better than the parent metallic glasses in some aspects.展开更多
Liquid-liquid interracial tension in binary and temary Al-based monotectic systems has been determined experimentally with a tensiometric method in a wide temperature interval. The temperature dependence of the interf...Liquid-liquid interracial tension in binary and temary Al-based monotectic systems has been determined experimentally with a tensiometric method in a wide temperature interval. The temperature dependence of the interfacial tension is well described by a power law function of the type σαβ - （1 - T/Tc）δ with the critical exponent δ= 1.3 and a critical temperature Tc. Theoretical models describing the liquid-liquid interface in monotectic alloys and their applicability for calculation of the interfacial tension and its temperature dependence in binary systems are considered.展开更多
基金Project(GJHZ20190822095418365)supported by Shenzhen International Cooperation Research,ChinaProject(2019011)supported by NTUT-SZU Joint Research Program,China+2 种基金Project(2019040)supported by Natural Science Foundation of Shenzhen University,ChinaProject(JCYJ20190808144009478)supported by Shenzhen Fundamental Research Fund,ChinaProject(ZDYBH201900000008)supported by Shenzhen Bureau of Industry and Information Technology,China。
文摘Selective laser melting(SLM)is an emerging layer-wise additive manufacturing technique that can generate complex components with high performance.Particulate-reinforced aluminum matrix composites(PAMCs)are important materials for various applications due to the combined properties of Al matrix and reinforcements.Considering the advantages of SLM technology and PAMCs,the novel SLM PAMCs have been developed and researched in recent years.Therefore,the current research progress about the SLM PAMCs is reviewed.Firstly,special attention is paid to the solidification behavior of SLM PAMCs.Secondly,the important issues about the design and fabrication of high-performance SLM PAMCs,including the selection of reinforcement,the influence of parameters on the processing and microstructure,the defect evolution and phase control,are highlighted and discussed comprehensively.Thirdly,the performance and strengthening mechanism of SLM PAMCs are systematically figured out.Finally,future directions are pointed out on the advancement of high-performance SLM PAMCs.
基金supported by the Space Application System of China Manned Space Program(No.KJZ-YY-NCL06)the National Natural Science Foundation of China(Nos.51974288,52174280)+1 种基金the Scientific Instrument Developing Project of the Chinese Academy of Sciences(No.YJKYYQ20210012)the IMR Innovation Fund(No.E255A901).
文摘Liquid-solid phase separation of permalloy in liquid Mg results in selectively dissolved Ni,which provides a unique opportunity for the design of immiscible heterogeneous composite materials and the comprehensive metal recycling of permalloy scraps.A guideline of the alloy design for the liquid-solid phase separation system was proposed.The effects of immersion temperature and time on the Ni extraction were studied by an experimental method.The diffusion behavior of Ni from the permalloy to liquid Mg and the microstructure evolution in the permalloy during the liquid-solid phase separation were discussed.The results show that the Ni in the permalloy was quickly extracted into the liquid Mg and formed an Mg-Ni alloy,while the other components such as Fe,Co,and Mn were held back in the phase-separated permalloy.The phase-separated permalloy with the solidified Mg exhibits a three-dimensional(3D)Fe/Mg bicontinuous composite structure.Furthermore,simple treatments were carried out for the reaction products such as the Fe/Mg bicontinuous composite and the Mg-Ni alloy,and the recycling strategies for functionalization of these treated reaction products were provided.A 3D porous Fe-based alloy with electromagnetic interference(EMI)shielding efficiency of 52 dB can be obtained if Mg is removed from the Fe/Mg bicontinuous composite.Instead of the complete separation of pure Ni from the recycled Mg-Ni alloy by vacuum distilling,the Mg-Ni alloy can be enriched into Mg2 Ni as an initial hydrogen storage material.
基金Xiaoliang Han acknowledges the financial support from the China Scholarship Council(CSC)and Leibniz IFW Dresden.Ivan Kaban and Michael Herbig acknowledges the financial support of the German Research Foundation DFG(Contracts Ka-3209/9-1 and HE 7225/1-1).supported by the German Federal Ministry of Education and Science BMBF within the framework of the Röntgen-˚Angström Cluster(Project 05K12OD1 of Jürgen Eckert)+2 种基金Jiri Orava acknowledges the assistance at J.E.Purkyne University in Usti nad Labem provided by the research infrastructure NanoEnviCz,which is supported by the Ministry of Education,Youth and Sports of the Czech Republic(No.LM2023066)Kaikai Song acknowledges the financial support from the Shenzhen Science and Technology Program(grant No.JCYJ20210324121011031)the National Natural Science Founda-tion of China(grant No.51871132).
文摘Metallic-glass-crystal composites of Cu_(47.5)Zr_(47.5)Al_(5)and Cu_(10)Zr_(7)-reinforced Cu_(46.5)Zr_(48)Al_(4)Nb_(1.5)nanocrystalline materials are obtained by flash-annealing of metallic-glass ribbons.In situ high-energy X-ray diffraction reveals the deformation mechanism of the alloys upon tensile loading.For the composites and nanocrystalline materials,a small remaining amount of the metallic glass and/or the presence of the Cu_(10)Zr_(7)phase significantly increase the value of yield stress while maintaining good tensile ductility.In general,the obtained materials exhibit a reversible martensitic transformation(MT)between the B_(2)CuZr and B19′/B33 phases during tensile loading and unloading.However,the reversibility of MT depends on the alloy composition,crystalline phases,and the number of(un)loading cycles.Serrated-like fluctuations on tensile stress-strain curves and a sign of twinning in the Cu_(10)Zr_(7)crystals are found after yielding in the Cu_(10)Zr_(7)-reinforced Cu_(46.5)Zr_(48)Al_(4)Nb_(1.5)nanocrystalline materials.Electrochemical measurements show that Cu_(46.5)Zr_(48)Al_(4)Nb_(1.5)nanocrystalline material has good corrosion resistance in NaCl and H_(2)SO_(4)solutions,even better than the parent metallic glasses in some aspects.
基金This work is financially supported by the German Research Society (Deutsche Forschungsgemeinschaft) under grant HO 1688/8-2 in the frame of the priority research program 1120 "Phase transitions in multicomponent alloys" ("Phasenum-wandlungen in merkomponentigen Schmelzen").
文摘Liquid-liquid interracial tension in binary and temary Al-based monotectic systems has been determined experimentally with a tensiometric method in a wide temperature interval. The temperature dependence of the interfacial tension is well described by a power law function of the type σαβ - （1 - T/Tc）δ with the critical exponent δ= 1.3 and a critical temperature Tc. Theoretical models describing the liquid-liquid interface in monotectic alloys and their applicability for calculation of the interfacial tension and its temperature dependence in binary systems are considered.
