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

Y. Wu, D. Ma, Q. K. Li, A. D. Stoica, W. L. Song, H. Wang, X. J. Liu, G. M. Stoica, G. Y. Wang, K. An, X. L. Wang, Mo Li, Z. P. Lu

Research output: Contribution to journalArticlepeer-review

103 Scopus citations

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.

Original languageEnglish
Pages (from-to)478-488
Number of pages11
JournalActa Materialia
Volume124
DOIs
StatePublished - Feb 1 2017
Externally publishedYes

Funding

This research was supported by National Natural Science Foundation of China (Nos. 51531001 , 51671018 , 51422101 , 51371003 and 51271212 ), 111 Project ( B07003 ), International S&T Cooperation Program of China ( 2015DFG52600 ) and Program for Changjiang Scholars and Innovative Research Team in University ( IRT_14R05 ). YW acknowledges the financial support from the Top-Notch Young Talents Program and Fundamental Research Fund for the Central Universities (Nos. FRF-TP-15-004C1 ). XLW acknowledges the support by Center for Advanced Structure Materials, City University of Hong Kong. The Research conducted on the VULCAN diffractometer at ORNL's Spallation Neutron Source was sponsored by the Scientific User Facilities Division, Office of Basic Energy Sciences, US Department of Energy. The authors also thank Dr. E. P. George, H. Bei, Y. F. Gao and Y. D. Wang, Z. Q. Sun for their fruitful discussion and Dr. E.A. Payzant (ORNL) for critical reading of the manuscript.

Keywords

  • Bulk metallic glass composite
  • Martensitic transformation
  • Molecular dynamic simulations
  • Neutron scattering
  • Transformation induced plasticity

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