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

Journal Article · · Acta Materialia
 [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

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.

Research Organization:
Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)
Sponsoring Organization:
USDOE
Grant/Contract Number:
AC05-00OR22725
OSTI ID:
1569397
Journal Information:
Acta Materialia, Vol. 124, Issue n/a; ISSN 1359-6454
Publisher:
ElsevierCopyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 84 works
Citation information provided by
Web of Science

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Cited By (7)

Martensitic Transformation and Plastic Deformation of TiCuNiZr-Based Bulk Metallic Glass Composites journal March 2018
Recent Advancements in Bulk Metallic Glasses and Their Applications: A Review journal August 2017
Tracing Phase Transformation and Lattice Evolution in a TRIP Sheet Steel under High-Temperature Annealing by Real-Time In Situ Neutron Diffraction journal September 2018
The Microalloying Effect of Ce on the Mechanical Properties of Medium Entropy Bulk Metallic Glass Composites journal September 2019
Microstructural Evolution from Dendrites to Core-Shell Equiaxed Grain Morphology for CoCrFeNiVx High-Entropy Alloys in Metallic Casting Mold journal October 2019
Event-based processing of neutron scattering data at the Spallation Neutron Source journal May 2018
In-situ tensile testing of ZrCu-based metallic glass composites other January 2018

Figures / Tables (5)


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