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Title: Transformation-induced plasticity in bulk metallic glass composites evidenced by in-situ neutron diffraction

Abstract

Transformation-induced plasticity in a strain-softening amorphous matrix consisting of austenite B2 phase was studied by in-situ neutron diffraction, coupled with molecular dynamic simulation. It was found that the martensitic transformation from B2 to B19' upon loading commenced at the macroscopic yielding which increased with the decrease of the fraction of the parent austenite B2 phase, and the threshold lattice strain for the martensitic transformation is almost the same in different samples, suggesting that the martensitic transformation in the current glassy matrix is strain-controlled. Analysis of load partition and strain accommodation unveiled that B2 has elastic anisotropy, and the desirable elastic match between B2 and the amorphous matrix ensures a good cooperative deformation. Additionally, molecular dynamic simulation revealed that atoms at the interface between B2 and the amorphous matrix deviated from the standard B2 lattices and acted as nucleation site for the martensitic transformation, eventually giving rise to the strain-controlled martensitic transformation. Our findings provide new insights into the mechanism of phase transformation-mediated plasticity at the microscopic level, and have useful implications for developing novel, high-performance bulk metallic glass composites.

Authors:
 [1]; ORCiD logo [2];  [1]; ORCiD logo [2];  [1];  [1];  [1];  [2];  [3]; ORCiD logo [2];  [4];  [1];  [1]
  1. Univ. of Science and Technology, Beijing (China). State Key Lab. for Advanced Metals and Materials
  2. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Chemical and Engineering Materials Division, Spallation Neutron Source
  3. Univ. of Tennessee, Knoxville, TN (United States). Dept. of Materials Science and Engineering
  4. City Univ. of Hong Kong, Kowloon (Hong Kong). Dept. of Physics and Materials Science
Publication Date:
Research Org.:
Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
1569397
Grant/Contract Number:  
AC05-00OR22725
Resource Type:
Accepted Manuscript
Journal Name:
Acta Materialia
Additional Journal Information:
Journal Volume: 124; Journal Issue: n/a; Journal ID: ISSN 1359-6454
Publisher:
Elsevier
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; bulk metallic glass composite; neutron scattering; transformation induced plasticity; martensitic transformation; molecular dynamic simulation

Citation Formats

Wu, Yuan, Ma, Dong, Li, Q. K., Stoica, Alexandru Dan, Song, W. L., Wang, H., Liu, X. J., Stoica, Grigoreta M., Wang, G. Y., An, Ke, Wang, Xun-Li, Li, Mo, and Lu, Zhao Ping. Transformation-induced plasticity in bulk metallic glass composites evidenced by in-situ neutron diffraction. United States: N. p., 2016. Web. doi:10.1016/j.actamat.2016.11.029.
Wu, Yuan, Ma, Dong, Li, Q. K., Stoica, Alexandru Dan, Song, W. L., Wang, H., Liu, X. J., Stoica, Grigoreta M., Wang, G. Y., An, Ke, Wang, Xun-Li, Li, Mo, & Lu, Zhao Ping. Transformation-induced plasticity in bulk metallic glass composites evidenced by in-situ neutron diffraction. United States. https://doi.org/10.1016/j.actamat.2016.11.029
Wu, Yuan, Ma, Dong, Li, Q. K., Stoica, Alexandru Dan, Song, W. L., Wang, H., Liu, X. J., Stoica, Grigoreta M., Wang, G. Y., An, Ke, Wang, Xun-Li, Li, Mo, and Lu, Zhao Ping. Tue . "Transformation-induced plasticity in bulk metallic glass composites evidenced by in-situ neutron diffraction". United States. https://doi.org/10.1016/j.actamat.2016.11.029. https://www.osti.gov/servlets/purl/1569397.
@article{osti_1569397,
title = {Transformation-induced plasticity in bulk metallic glass composites evidenced by in-situ neutron diffraction},
author = {Wu, Yuan and Ma, Dong and Li, Q. K. and Stoica, Alexandru Dan and Song, W. L. and Wang, H. and Liu, X. J. and Stoica, Grigoreta M. and Wang, G. Y. and An, Ke and Wang, Xun-Li and Li, Mo and Lu, Zhao Ping},
abstractNote = {Transformation-induced plasticity in a strain-softening amorphous matrix consisting of austenite B2 phase was studied by in-situ neutron diffraction, coupled with molecular dynamic simulation. It was found that the martensitic transformation from B2 to B19' upon loading commenced at the macroscopic yielding which increased with the decrease of the fraction of the parent austenite B2 phase, and the threshold lattice strain for the martensitic transformation is almost the same in different samples, suggesting that the martensitic transformation in the current glassy matrix is strain-controlled. Analysis of load partition and strain accommodation unveiled that B2 has elastic anisotropy, and the desirable elastic match between B2 and the amorphous matrix ensures a good cooperative deformation. Additionally, molecular dynamic simulation revealed that atoms at the interface between B2 and the amorphous matrix deviated from the standard B2 lattices and acted as nucleation site for the martensitic transformation, eventually giving rise to the strain-controlled martensitic transformation. Our findings provide new insights into the mechanism of phase transformation-mediated plasticity at the microscopic level, and have useful implications for developing novel, high-performance bulk metallic glass composites.},
doi = {10.1016/j.actamat.2016.11.029},
journal = {Acta Materialia},
number = n/a,
volume = 124,
place = {United States},
year = {Tue Nov 22 00:00:00 EST 2016},
month = {Tue Nov 22 00:00:00 EST 2016}
}

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Figures / Tables:

Table 1 Table 1: Experimentally determined $hkl$-specific diffraction elastic constants of B2 (Ehkl) and the reciprocal (1/ Ehkl), with respect to the loading direction, in T1 and T2, compared with those determined from the 020 reflection of B19′ and from the first sharp diffraction peak (FSDP) of the amorphous phase in T1.

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