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Real-time, high-resolution study of nanocrystallization and fatigue cracking in a cyclically strained metallic glass

2013; National Academy of Sciences; Volume: 110; Issue: 49 Linguagem: Inglês

10.1073/pnas.1320235110

1091-6490

Cheng-Cai Wang, Yunwei Mao, Zhiwei Shan, Ming Dao, Ju Li, Jun Sun, E. Ma, Subra Suresh,

Microstructure and mechanical properties

Significance The formation of nanocrystals and cracks in metallic glasses subjected to cyclically varying strains in micro- and nanoscale systems is a topic of scientific and technological interest. However, no real-time studies of such phenomena in fatigued metallic glasses have thus far been reported. Here we present unique observations of nanocrystallization and the onset and progression of fatigue failure in a metallic glass through cyclic straining experiments conducted inside a high-resolution transmission electron microscope. Molecular dynamics simulations were also performed to elucidate the underlying mechanisms. We expect that these techniques and results will provide unique fundamental insights into how crystallization occurs in a wide variety of amorphous materials and will help develop strategies for the design and use of metallic glasses.