The Embrittlement and Toughening of Metallic Glasses from Nano-Crystallization

26 Pages Posted: 31 Oct 2018

See all articles by Binghui Deng

Binghui Deng

Rensselaer Polytechnic Institute (RPI) - Department of Materials Science and Engineering

Yunfeng Shi

Rensselaer Polytechnic Institute (RPI) - Department of Materials Science and Engineering

Date Written: October 31, 2018

Abstract

Metallic glasses with secondary crystalline phase have been reported to either enhance or degrade the global plasticity. Here we employed molecular dynamics simulation to investigate a generic glass-forming system, in which crystal-glass composites can be obtained via in-situ crystallization. Ex-situ composite samples were also constructed by embedding perfect crystals into monolithic glasses in order to delineate the precise influence of the composite microstructure. Our simulations demonstrate both the toughening and embrittlement due to nano-crystallization. The double-edge-sword role of nanocrystals is mainly controlled by elastic mismatch between the crystalline phase and the glass matrix. The effects of volume fraction and size of nanocrystals can be understood in the perspective of cumulative probability of shear bands formation and propagation being interfered by the presence of nanocrystals.

Keywords: Nanocomposites, nano-crystallization, embrittlement, toughening, fracture

Suggested Citation

Deng, Binghui and Shi, Yunfeng, The Embrittlement and Toughening of Metallic Glasses from Nano-Crystallization (October 31, 2018). Available at SSRN: https://ssrn.com/abstract=3275450 or http://dx.doi.org/10.2139/ssrn.3275450

Binghui Deng (Contact Author)

Rensselaer Polytechnic Institute (RPI) - Department of Materials Science and Engineering

Troy, NY 12180
United States

Yunfeng Shi

Rensselaer Polytechnic Institute (RPI) - Department of Materials Science and Engineering ( email )

Troy, NY 12180
United States

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