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
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.
