TY - JOUR
T1 - Mechanical glass transition revealed by the fracture toughness of metallic glasses
AU - Ketkaew, Jittisa
AU - Chen, Wen
AU - Wang, Hui
AU - Datye, Amit
AU - Fan, Meng
AU - Pereira, Gabriela
AU - Schwarz, Udo D.
AU - Liu, Ze
AU - Yamada, Rui
AU - Dmowski, Wojciech
AU - Shattuck, Mark D.
AU - O’Hern, Corey S.
AU - Egami, Takeshi
AU - Bouchbinder, Eran
AU - Schroers, Jan
N1 - Funding Information:
We warmly thank Prof. Frans Spaepen for fruitful discussions. This work was supported by the U.S. Department of Energy through the Office of Science, Basic Energy Sciences, Materials Science and Engineering Division (No. DE SC0004889). Structural characterization was carried out at the Advanced Photon Source, a U.S. Department of Energy (DOE) Office of Science User Facility, operated for the DOE Office of Science by Argonne National Laboratory under Contract DE-AC02-06CH11357. E.B. acknowledges support from the Richard F. Goodman Yale/Weizmann Exchange Program. A.D. acknowledges support by the Department of Energy through grant No. DE-SC0016179.
Publisher Copyright:
© 2018, The Author(s).
PY - 2018/12/1
Y1 - 2018/12/1
N2 - The fracture toughness of glassy materials remains poorly understood. In large part, this is due to the disordered, intrinsically non-equilibrium nature of the glass structure, which challenges its theoretical description and experimental determination. We show that the notch fracture toughness of metallic glasses exhibits an abrupt toughening transition as a function of a well-controlled fictive temperature (Tf), which characterizes the average glass structure. The ordinary temperature, which has been previously associated with a ductile-to-brittle transition, is shown to play a secondary role. The observed transition is interpreted to result from a competition between the Tf-dependent plastic relaxation rate and an applied strain rate. Consequently, a similar toughening transition as a function of strain rate is predicted and demonstrated experimentally. The observed mechanical toughening transition bears strong similarities to the ordinary glass transition and explains the previously reported large scatter in fracture toughness data and ductile-to-brittle transitions.
AB - The fracture toughness of glassy materials remains poorly understood. In large part, this is due to the disordered, intrinsically non-equilibrium nature of the glass structure, which challenges its theoretical description and experimental determination. We show that the notch fracture toughness of metallic glasses exhibits an abrupt toughening transition as a function of a well-controlled fictive temperature (Tf), which characterizes the average glass structure. The ordinary temperature, which has been previously associated with a ductile-to-brittle transition, is shown to play a secondary role. The observed transition is interpreted to result from a competition between the Tf-dependent plastic relaxation rate and an applied strain rate. Consequently, a similar toughening transition as a function of strain rate is predicted and demonstrated experimentally. The observed mechanical toughening transition bears strong similarities to the ordinary glass transition and explains the previously reported large scatter in fracture toughness data and ductile-to-brittle transitions.
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U2 - 10.1038/s41467-018-05682-8
DO - 10.1038/s41467-018-05682-8
M3 - Article
C2 - 30115910
AN - SCOPUS:85051648217
SN - 2041-1723
VL - 9
JO - Nature Communications
JF - Nature Communications
IS - 1
M1 - 3271
ER -