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The Coupling Effect of Small Nanocrystals and Free Volume on the Ductility of Cu 46 Zr 47 Al 7 Bulk Metallic Glass Alloy
Author(s) -
Jiang Feng,
Zhao Yanglei,
Zhang Lincai,
Pan Shibin,
Zhou Yinggang,
He Lin,
Sun Jun
Publication year - 2009
Publication title -
advanced engineering materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.938
H-Index - 114
eISSN - 1527-2648
pISSN - 1438-1656
DOI - 10.1002/adem.200800363
Subject(s) - materials science , amorphous metal , ductility (earth science) , annealing (glass) , metallurgy , alloy , differential scanning calorimetry , quenching (fluorescence) , volume (thermodynamics) , composite material , vitrification , nanocrystal , creep , nanotechnology , thermodynamics , physics , medicine , andrology , quantum mechanics , fluorescence
Cu 46 Zr 47 Al 7 bulk metallic glass (BMG) and its composite containing small in situ precipitated nanocrystals were prepared through copper mold casting. Different free volume states of these Cu 46 Zr 47 Al 7 alloys were obtained through thermal treatment such as annealing and quenching. Three‐point bending tests for these alloys were undertaken to evaluate their plastic deformation ability. Free volume changes were measured indirectly but quantitatively with differential scanning calorimetry (DSC) method. The results show that, the ductility of Cu 46 Zr 47 Al 7 alloys is closely related with the free volume states and the ductility of thermally embrittled Cu 46 Zr 47 Al 7 alloys samples can be partially recovered by restoring free volume through quenching process. The presence of small nanocrystals is more efficient than free volume to enhance the ductility. However, only with the concurrence of the small nanocrystals and the free volume, the Cu 46 Zr 47 Al 7 BMG alloys will present excellent ductility.