Behavior of Tantalum Single Crystals

Jay Carroll1, Hojun Lim1, J. Matthew Lane1, Corbett C. Battaile1, Shuh-Rong Chen2

  1. Sandia National Laboratories
  2. Los Alamos National Laboratory

The slip systems in BCC refractory metals such as tantalum are not well understood. While it is generally accepted that the slip of screw dislocations in these materials occurs along <111> directions, evidence exists to support slip on {110}, {112}, or {123} planes, and even combinations of those three. Consequently, constructing crystallographic models for predicting the behavior of these metals at various loading rates and temperatures is challenging. This work is addressing the challenge through experiments on single- and multi-crystal specimens and through crystal plasticity model predictions. This work compares different single crystal orientations in tension, compression, and Taylor impact testing to ascertain fundamental slip behavior and improve our understanding and predictions of material behavior.

Sandia National Laboratories is a multi-mission laboratory managed and operated by National Technology and Engineering Solutions of Sandia, LLC., a wholly owned subsidiary of Honeywell International, Inc., for the U.S. Department of Energy’s National Nuclear Security Administration under contract DE-NA0003525.