期刊
INTERMETALLICS
卷 23, 期 -, 页码 199-203出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.intermet.2011.12.004
关键词
Nanostructured intermetallics; Alloy design; Casting; Microstructure
资金
- National Basic Research Program of China [2007CB613900]
- Innovation Foundation of BUAA for PhD Graduates
An in-situ ultrahigh-strength ductile Al-based bulk alloy was produced by copper mold casting method. According to the microstructural investigations, ultrafine-grained/nanocrystalline eutectic colonies with length-scale heterogeneity of lamellar structure have been observed, besides few primary Ag51Y14 phase with a size scale of 1-5 mu m. The macroscopic and microscopic structural heterogeneities are able to achieve high strength of up to 1.24 GPa and large compressive plasticity of 26%, which is considered to be attributable to the hierarchical network of strengthening intermetallic phases combining with deformable alpha-Al solid solution suppressing the propagation of microcracks or shear bands. (C) 2011 Elsevier Ltd. All rights reserved.
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