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Materials science & engineering. properties, microstructure and processing. A, Structural materials v.685, 2017년, pp.294 - 299   SCI SCIE
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On the spherical nanoindentation creep of metallic glassy thin films at room temperature

Zhang, T.H. (Institution of Micro/Nano-Mechanical Testing Technology & Application, College of Mechanical Engineering, Zhejiang University of Technology, Hangzhou 310014, PR China ) ; Ye, J.H. (Institution of Micro/Nano-Mechanical Testing Technology & Application, College of Mechanical Engineering, Zhejiang University of Technology, Hangzhou 310014, PR China ) ; Feng, Y.H. (State Key Laboratory of Nonlinear Mechanics (LNM), Institute of Mechanics, Chinese Academy of Sciences, Beijing 100190, PR China ) ; Ma, Y. (Institution of Micro/Nano-Mechanical Testing Technology & Application, College of Mechanical Engineering, Zhejiang University of Technology, Hangzhou 310014, PR China ) ;
  • 초록  

    Abstract Metallic glassy thin films with eight kind of compositions were successfully prepared on Si substrate by magnetron sputtering. The room-temperature creep tests were performed at plastic regions for each sample relying on spherical nanoindetation. The creep deformations were studied by recording the total creep displacement and strain after 2000s holding. More pronounced creep deformation was observed in the sample with lower glass transition temperature ( T g ). Strain rate sensitivity (SRS) was then calculated from the steady-state creep and exhibited a negative correlation with increasing T g . It is suggested that creep mechanism of the nano-sized metallic glass was T g -dependent, according to the demarcation of SRS values. Based on the obtained SRS, shear transformation zone (STZ) size in each sample could be estimated. The results indicated that an STZ involves about 25–60 atoms for the employed eight samples and is strongly tied to T g . The characteristic of STZ size in metallic glassy thin films was discussed in terms of applied method and deformation modes.


  • 주제어

    Nanoindentation .   Creep .   Metallic glassy film .   Strain rate sensitivity .   Shear transformation zone.  

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