Journal
MATERIALS CHARACTERIZATION
Volume 120, Issue -, Pages 263-267Publisher
ELSEVIER SCIENCE INC
DOI: 10.1016/j.matchar.2016.09.016
Keywords
beta Ti alloys; {332}< 113 > mechanical twinning; Hall-Petch effect; Mechanical property
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Funding
- National Natural Science Foundation of China [51371113]
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The role of grain size in tensile behavior in a metastable beta Ti-20V-2Nb-2Zr mass % alloy was investigated. {332}< 113 > mechanical twins are activated at high Schmid factors during tensile deformation and twinning becomes more difficult as the average grain size decreases. The dynamic Hall-Petch effect explains reasonably the decrease of the work hardening rate with decreasing grain size. The Hall-Petch equation applies when {332}< 113 > twinning is dominant, and the Hall-Petch slope for {332}< 113 > twinning is greater than that for dislocation gliding. (C) Elsevier Inc All rights reserved.
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