Shock induced amorphization as the onset of spall

Yinon Ashkenazy*, Robert S. Averback

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

28 Scopus citations


Spall formation in the glass-forming alloy Cu-Ti was studied via molecular dynamics simulations. It is shown that spall initiation is a combined process where void nucleation is accompanied by local amorphization. The amorphous regions nucleate at the surfaces of the voids at a critical stress and then grow, allowing the voids to grow faster in the mechanically less stable amorphous region. Dislocations are emitted from the amorphous regions and form shear bands between the amorphous regions. Subspall events result in the formation of a damaged layer, including voids, amorphous regions, and shear bands. The simulations are consistent with recent experimental observation of intergranular amorphous bands in shocked boron carbide.

Original languageAmerican English
Article number051907
Pages (from-to)1-3
Number of pages3
JournalApplied Physics Letters
Issue number5
StatePublished - 31 Jan 2005

Bibliographical note

Funding Information:
The research was supported by the U.S. Department of Energy (USDOE) Basic Energy Sciences, under Grant No. DEFG02-91ER45439 and the USDOE through the University of California under Subgrant B341494, No. 73722, and the USDOE National Nuclear Security Administration, under Grant No. DEFG03-02NA00070. Grants of computer time from the National Center for Supercomputing Applications and the National Energy Research Scientific Computing Center are gratefully acknowledged.


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