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Effects of rejuvenation modes on the microstructures and mechanical properties of metallic glasses

Journal Article · · Materials Today Communications
 [1];  [2];  [3];  [4]
  1. Xi'an Jiaotong University (China); University of Southern California
  2. Nanjing University of Chinese Medicine (China)
  3. University of Southern California, Los Angeles, CA (United States)
  4. Xi'an Jiaotong University (China); Chinese Academy of Sciences (CAS), Beijing (China)
This study systematically investigates the effects of three rejuvenation modes, namely biaxial loading, thermal pressure loading, and cryogenic thermal cycling, on the microstructures and mechanical properties of Cu64Zr36 metallic glasses (MGs) using molecular dynamics (MD) simulations. The simulation results demonstrate that biaxial tension application during loading results in a rejuvenated glassy state with high strength. Specifically, we find that the yield stress, Young's modulus, and shear modulus of the rejuvenated glass obtained by biaxial tensile loading decreased by 2.8%, 2.1%, and 2.7%, respectively, compared to an as-cast MG reference. We also find that MGs achieve the greatest degree of rejuvenation, at the expense of strength, with the use of thermal pressure loading. Interestingly, the application of cryogenic thermal cycling results in a rejuvenated state with a lower strength drop compared to thermal pressure loading. Furthermore, analysis of the potential energy and medium-range-order (MRO) size indicates that the microstructures of MGs achieves a high-energy ordered glass state after thermal pressure loading, but a high-energy disordered glass state after biaxial tensile loading and cryogenic thermal cycling. Furthermore, these findings provide meaningful insights into the effect of rejuvenation modes on the microstructures and mechanical properties of MGs, as well as useful guidelines for designing MGs with high strength and superior plasticity for prospective applications in industry.
Research Organization:
University of Southern California, Los Angeles, CA (United States)
Sponsoring Organization:
National Natural Science Foundation of China; USDOE Office of Science (SC), Basic Energy Sciences (BES)
Grant/Contract Number:
SC0020295
OSTI ID:
1986258
Alternate ID(s):
OSTI ID: 2000627
Journal Information:
Materials Today Communications, Journal Name: Materials Today Communications Vol. 36; ISSN 2352-4928
Publisher:
ElsevierCopyright Statement
Country of Publication:
United States
Language:
English

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