期刊
JOURNAL OF MATERIALS RESEARCH
卷 24, 期 8, 页码 2605-2609出版社
CAMBRIDGE UNIV PRESS
DOI: 10.1557/JMR.2009.0297
关键词
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资金
- Korea Ministry of Education, Science, and Technology
- AFOSR Task: Basic Research for AOARD [084013]
An in situ bulk ultrafine bimodal eutectic Al-Cu-Si composite was synthesized by solidification. This heterostructured composite with microstructural length scale hierarchy in the eutectic microstructure, which combines an ultrafine-scale binary cellular eutectic (alpha-Al + Al2Cu) and a nanometer-sized anomalous ternary eutectic (alpha-Al + Al2Cu + Si), exhibits high fracture strength (1.1 +/- 0.1 GPa) and large compressive plastic strain (11 +/- 2%) at room temperature. The improved compressive plasticity of the bimodal-nanoeutectic composite originates from homogeneous and uniform distribution of inhomogeneous plastic deformation (localized shear bands), together with strong interaction between shear bands in the spatially heterogeneous structure.
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