Journal
PHILOSOPHICAL MAGAZINE LETTERS
Volume 94, Issue 10, Pages 658-668Publisher
TAYLOR & FRANCIS LTD
DOI: 10.1080/09500839.2014.955548
Keywords
thermodynamics; ductile-to-brittle transition; shear bands; metallic glass; Poisson's ratio
Categories
Funding
- National Natural Science Foundation of China [50890173, 51331007]
- National Basic Research Program of China [2010CB631006]
- IMR SYNL-T.S. Ke Research Fellowship
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The energetic driving force and resistance for shearing and cracking in metallic glasses (MGs) are quantitatively evaluated. A universal thermodynamic criterion is proposed for better understanding the intrinsic correlations between fracture toughness and Poisson's ratio, the competitions between various deformation modes and the ductile-to-brittle transition in MGs and other materials. A new cooperation parameter delta is also introduced to depict quantitatively the relative propensity of shearing versus cracking. This work could provide insights into the long-standing issues of deformation mechanisms of glassy materials, and be helpful in searching for ductile and tough MGs.
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