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Title: The effect of thermal cycling on the fracture toughness of metallic glasses

Abstract

A wide range of behaviors, including non-monotonic rejuvenation and relaxation, and the ability to qualitatively change the effect by varying the structural state of the glass was observed during thermal cycling of bulk metallic glasses. For this, we considered various bulk metallic glasses, Zr44Ti11Cu10Ni10Be25, Pd43Cu27Ni10P20, Pt57.5Cu14.7Ni5.3P22.5, and La55Al25Ni20, at various fictive temperatures to study the effect of thermal cycling on structure, thermal signature, and fracture toughness. For some BMGs and conditions considered here, thermal cycling results in a looser structure and an increase in fracture toughness. We found that for certain other BMGs and conditions, thermal cycling results in relaxation, reflected in a denser structure, and a decrease in fracture toughness. All these responses are non-monotonic and reveal a pronounced extremum with fracture toughness values of ± 50% of the original value, before approaching a value similar to the original value prior to thermal cycling. Such richness in response to thermal cycling suggests incompleteness of the previous picture where monotonically decreasing local stresses resulting in a homogenization of the structure with increasing cycle number. Our finding suggests that relative comparisons of various contributions including activation barriers for α-relaxation have to be considered which are also constantly changing, to decide ifmore » further cycling results in an increase or a decrease in fracture toughness. The fracture toughness’ response to thermal cycling can be correlated with the average atomic structures’ response to thermal cycling, while the thermal response does not exhibit an obvious correlation.« less

Authors:
 [1];  [2];  [3];  [1];  [1]; ORCiD logo [3];  [4];  [1]
  1. Yale Univ., New Haven, CT (United States)
  2. Tohoku Univ., Sendai (Japan)
  3. Univ. of Tennessee, Knoxville, TN (United States)
  4. Univ. of Tennessee, Knoxville, TN (United States); Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Publication Date:
Research Org.:
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22). Materials Sciences & Engineering Division
OSTI Identifier:
1630509
Alternate Identifier(s):
OSTI ID: 1576081
Grant/Contract Number:  
AC05-00OR22725; SC0004889; AC02-06CH11357
Resource Type:
Accepted Manuscript
Journal Name:
Acta Materialia
Additional Journal Information:
Journal Volume: 184; Journal Issue: C; Journal ID: ISSN 1359-6454
Publisher:
Elsevier
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; bulk metallic glasses; fracture toughness; structural relaxation; thermal cycling rejuvenation

Citation Formats

Ketkaew, Jittisa, Yamada, Rui, Wang, Hui, Kuldinow, Derek, Schroers, Benjamin Sol, Dmowski, Wojciech, Egami, Takeshi, and Schroers, Jan. The effect of thermal cycling on the fracture toughness of metallic glasses. United States: N. p., 2019. Web. https://doi.org/10.1016/j.actamat.2019.11.046.
Ketkaew, Jittisa, Yamada, Rui, Wang, Hui, Kuldinow, Derek, Schroers, Benjamin Sol, Dmowski, Wojciech, Egami, Takeshi, & Schroers, Jan. The effect of thermal cycling on the fracture toughness of metallic glasses. United States. https://doi.org/10.1016/j.actamat.2019.11.046
Ketkaew, Jittisa, Yamada, Rui, Wang, Hui, Kuldinow, Derek, Schroers, Benjamin Sol, Dmowski, Wojciech, Egami, Takeshi, and Schroers, Jan. Wed . "The effect of thermal cycling on the fracture toughness of metallic glasses". United States. https://doi.org/10.1016/j.actamat.2019.11.046. https://www.osti.gov/servlets/purl/1630509.
@article{osti_1630509,
title = {The effect of thermal cycling on the fracture toughness of metallic glasses},
author = {Ketkaew, Jittisa and Yamada, Rui and Wang, Hui and Kuldinow, Derek and Schroers, Benjamin Sol and Dmowski, Wojciech and Egami, Takeshi and Schroers, Jan},
abstractNote = {A wide range of behaviors, including non-monotonic rejuvenation and relaxation, and the ability to qualitatively change the effect by varying the structural state of the glass was observed during thermal cycling of bulk metallic glasses. For this, we considered various bulk metallic glasses, Zr44Ti11Cu10Ni10Be25, Pd43Cu27Ni10P20, Pt57.5Cu14.7Ni5.3P22.5, and La55Al25Ni20, at various fictive temperatures to study the effect of thermal cycling on structure, thermal signature, and fracture toughness. For some BMGs and conditions considered here, thermal cycling results in a looser structure and an increase in fracture toughness. We found that for certain other BMGs and conditions, thermal cycling results in relaxation, reflected in a denser structure, and a decrease in fracture toughness. All these responses are non-monotonic and reveal a pronounced extremum with fracture toughness values of ± 50% of the original value, before approaching a value similar to the original value prior to thermal cycling. Such richness in response to thermal cycling suggests incompleteness of the previous picture where monotonically decreasing local stresses resulting in a homogenization of the structure with increasing cycle number. Our finding suggests that relative comparisons of various contributions including activation barriers for α-relaxation have to be considered which are also constantly changing, to decide if further cycling results in an increase or a decrease in fracture toughness. The fracture toughness’ response to thermal cycling can be correlated with the average atomic structures’ response to thermal cycling, while the thermal response does not exhibit an obvious correlation.},
doi = {10.1016/j.actamat.2019.11.046},
journal = {Acta Materialia},
number = C,
volume = 184,
place = {United States},
year = {2019},
month = {11}
}

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Cited by: 6 works
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