A new class of Al-base multi-phase ultrafine composites with multi-scale microstructure, which exhibits high strength and large compressive plasticity at ambient temperature, has been developed in the Al-Cu-Si ternary system. The formation of the favorable multi-phase multi-modal structure can be achieved by proper alloy selection and by controlling the solidification process. The developed hierarchical ultrafine composites exhibit high fracture strength of ∼1 GPa and large compressive plasticity up to ∼25%. The large macroscopic plastic strain is attributed to the combination of dislocation-based slip deformation in the ductile phase and extensive shear banding in the intermetallic phase.
Bibliographical noteFunding Information:
This work was supported by the Global Research Laboratory Program of the Korea Ministry of Education, Science and Technology . Stimulating discussions with G. Wang, J. Jayaraj, K. Chattopadhyay and S. Pauly are gratefully acknowledged.
All Science Journal Classification (ASJC) codes
- Mechanics of Materials
- Mechanical Engineering
- Metals and Alloys
- Materials Chemistry