November 2012 - Sandia National Laboratories

Newsnote

Week of December 17, 2012

contributed by Corbett Battaile [email protected] Chris Weinberger [email protected] Plasticity in metals is governed by collective motion and interactions of dislocations. BCC metals differ from FCC metals in how slip planes impact dislocations. PPM mesoscale team developed a simple temperature and rate dependent model for low-temperature plasticity in BCC transition metals. Based on dislocation kink-pair theory, the comparison achieves excellent validation across a broad phase space. Rate and temperature dependent plasticity is an important development milepost for high loading applications.

Figure – Sandia PPM team incorporated temperature and rate effects in plasticity behavior for BCC metals.

Sandia National Laboratories is a multi-program laboratory managed and operated by Sandia Corporation, a wholly owned subsidiary of Lockheed Martin Corporation, for the U.S. Department of Energy’s National Nuclear Security Administration under contract DE-AC04-94AL85000. SAND NO. 2013-7486P