Dislocation multi-junctions and strain hardening

Vasily V. Bulatov (), Luke L. Hsiung, Meijie Tang, Athanasios Arsenlis, Maria C. Bartelt, Wei Cai, Jeff N. Florando, Masato Hiratani, Moon Rhee, Gregg Hommes, Tim G. Pierce and Tomas Diaz de la Rubia
Additional contact information
Vasily V. Bulatov: University of California
Luke L. Hsiung: University of California
Meijie Tang: University of California
Athanasios Arsenlis: University of California
Maria C. Bartelt: University of California
Wei Cai: University of California
Jeff N. Florando: University of California
Masato Hiratani: University of California
Moon Rhee: University of California
Gregg Hommes: University of California
Tim G. Pierce: University of California
Tomas Diaz de la Rubia: University of California

Nature, 2006, vol. 440, issue 7088, 1174-1178

Abstract: Strength in numbers Strain hardening, also called work hardening, is a property of crystalline materials much valued by engineers: under load, strong materials can become even stronger. For many years, strain hardening was thought to arise from pair-wise dislocation collisions in which intersecting dislocations form strength-generating junctions. Now a group working at Lawrence Livermore National Laboratory has shown that this theory is incomplete as it ignores many-body dislocation interactions. New simulations, backed up by experiments on molybdenum crystals, show that crystals harden under strain because dislocation lines bundle together in threes into tight knots that form multiple junctions.

Date: 2006
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DOI: 10.1038/nature04658

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