Critical Crystallization for Embrittlement in Metallic Glasses

Physical Review Letters
Jittisa KetkaewJan Schroers

Abstract

We studied the effect of crystallization on the embrittlement of bulk metallic glasses. Specifically, we measured fracture toughness for Zr_{44}Ti_{11}Cu_{10}Ni_{10}Be_{25} and Pd_{43}Cu_{27}Ni_{10}P_{20} after annealing at various times to introduce controlled volume fraction of crystallization. We found that crystallization of up to ∼6% by volume does not measurably affect fracture toughness. When exceeding ∼6%, a dramatic drop in fracture toughness occurs; an additional 1% of crystallization reduces fracture toughness by 50%. Such a dramatic transition can be explained by the interaction among the crystals' stress fields in the amorphous matrix that becomes effective at ∼7% crystallinity. Our findings of a critical crystallization for embrittlement of metallic glasses help in designing tough metallic glasses and their composites, as well as defining processing protocols for the unique thermoplastic forming of metallic glasses to avoid embrittlement.

References

Feb 9, 2005·Physical Review Letters·Jan Schroers, William L Johnson
May 21, 2005·Physical Review Letters·X K XiJ J Lewandowski
Aug 11, 2005·Physical Review Letters·Jayanta DasJürgen Eckert
Feb 29, 2008·Nature·Douglas C HofmannWilliam L Johnson
May 25, 2010·Advanced Materials·Jan Schroers
Jan 11, 2011·Nature Materials·Marios D DemetriouRobert O Ritchie
Feb 28, 2013·Nature Communications·Golden KumarJan Schroers
Jul 19, 2013·Nature Communications·Baran Sarac, Jan Schroers
Aug 8, 2015·Physical Review Letters·Yue FanTakeshi Egami

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Citations

Jul 30, 2020·Journal of Physics. Condensed Matter : an Institute of Physics Journal·Cédric Bernard, Vincent Keryvin

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