期刊
SCRIPTA MATERIALIA
卷 138, 期 -, 页码 44-47出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.scriptamat.2017.05.033
关键词
Titanium alloys; Spark plasma sintering; EBSD; Twinning; Harmonic structure
类别
资金
- French national research Agency [ANR 14-CE07-0003]
Spark plasma sintering was used to fabricate two Ti-25Zr-25Nb beta-titanium alloys having a homogeneous microstructure and a so-called harmonic structure. Mechanical properties were evaluated by simple shear cyclic tests. The sample with homogeneous microstructure shows a large cumulative strain similar to 400% and a two-stage work hardening associated with intense {332} < 11.3 > mechanical twinning activity. Conversely, the harmonic-designed microstructure exhibits lesser cumulative strain similar to 200% but a higher cyclic strength. A complete twinning inhibition is observed. Indeed, the ultrafine-grained shell of the harmonic structure dispersed stress concentration. It accommodates plastic incompatibilities due to grain size difference by accumulating geometrically necessary dislocations at the shell/core vicinity. (C) 2017 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.
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