期刊
SCRIPTA MATERIALIA
卷 172, 期 -, 页码 165-170出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.scriptamat.2019.07.034
关键词
Heterogeneous composites; Plastic deformation; Mechanical properties; Strain delocalization; Image analysis
类别
资金
- National Natural Science Foundation of China [51701081, 51872118, 51571070, 51571071]
- Young-aged Talents Lifting Project from Shandong Association for Science Technology [301-1505001]
- Shandong Provincial Natural Science Foundation, China [ZR2017BEM001, ZR2018PEM008]
- Training Program of Major Scientific Research Project of Harbin Institute of Technology [ZDXMPY20180103]
- Key Research and Development Program of Shandong Province [2019GGX104077]
Realizing strength-ductility synergy of traditional metals and alloys always remains technically challenging. Here we reconcile this trade-off dilemma by engineering Ti/Ti3Al ductile/brittle laminated composites, simultaneously with macroscopically laminated structure and microscopically compositional gradient. Such a kind of previously unidentified laminated/gradient heterogeneous composite exhibits excellent property combinations. Coupling three-dimensional X-ray tomography, in situ straining and digital image correlation (DIC) demonstrated a new microstructure-mediated strain transfer path, stabilizing the plastic flow through the delocalizing of highly localized deformation modes. These findings provide appealing prospects for the design of strong and tough metallic alloys through manipulating plastic strain delocalization as much as possible. (C) 2019 Acta Materialia Inc Published by Elsevier Ltd. All rights reserved.
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