期刊
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
卷 528, 期 21, 页码 6606-6615出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.msea.2011.05.037
关键词
Metal matrix composites; Powder metallurgy; Nanostructured materials; Mechanical properties
类别
资金
- Gebert Ruf Stiftung [GRS 19/07]
- Estonian Ministry of Education and Research [SF0140062s08]
- Estonian Science Foundation [G8472]
High-energy milling was studied for the ex situ strengthening of aluminium with silicon carbide (SiC) nanopowders. Heptane was used as a milling agent for both planetary- and attritor ball milling. Considering the different milling techniques and the differences in the resulting powders, effective dispersion of the nano SiC was achieved. Composite samples compacted by hot pressing showed an increase in hardness (HV20 = 220) and a decrease in Al crystallite size from 220 to 55 nm with the nano-SiC content increasing from 1 up to 20 vol.%. The ultimate tensile strength was measured for extruded samples which resulted in 205 MPa (17% elongation) for 1 vol.% of nano-SiC and a strength of 420 MPa (4% elongation) for 10 vol.% of nano-SiC reinforcement. The mechanical properties were compared with what was predicted by the Hall-Petch relationship. (C) 2011 Elsevier B.V. All rights reserved.
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