期刊
MATERIALS & DESIGN
卷 88, 期 -, 页码 451-460出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.matdes.2015.08.162
关键词
Aluminum; Composites; Boron nitride nanotubes; High pressure torsion; Tensile strength
资金
- National Institute for Materials Science (NIMS) [BB063]
- MEXT [23310082]
- MEXT, Japan [22102004]
- World Premier International (WPI) Center for Materials Nanoarchitectonics (MANA) of the National Institute for Materials Science (NIMS) [BB005]
- National University of Science and Technology MISIS, Moscow, Russian Federation [11.G34.31.0061]
- Increase Competiveness Program of NUST (MISIS) [K2-2015-001]
- Australian Research Council [LE0454166]
- Victorian State Government
- Grants-in-Aid for Scientific Research [23310082] Funding Source: KAKEN
Aluminum matrix composites loaded with various fractions of multi-walled, well-structured boron nitride nanotubes (BNNTs), up to 5 wt.% fractions, were fabricated using powder constituents by means of a high pressure torsion technique (HPT) at room temperature under 5 GPa pressurization. Transient ultrathin amorphous-like layers, with a thickness of 2-5 nm, composed of Al(BNO) phases, which formed under severe plastic deformation and developed under further heat treatments of the composites at 350 degrees C and 450 degrees C, were detected at the interfacial regions between Al grains and tightly embracing them BN layers. Room temperature hardness and tensile tests on fabricated composites before and after heat treatments were conducted. The highest value of room temperature tensile strength was obtained on Al-5 wt.% BNNT samples annealed at 450 degrees C, that reached up to similar to 420 MPa, thus exhibiting more than a doubled increase in strength compared to HPT-fabricated pure Al samples under identical compacting conditions. (C) 2015 Elsevier Ltd. All rights reserved.
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