Two-Step SPD Processing of a Trimodal Al-Based Nano-Composite

Yuzheng Zhang; Shima Sabbaghianrad; Hanry Yang; Troy Topping; Terence Langdon; Enrique Lavernia; Julie Schoenung; Steven Nutt

doi:10.1007/s11661-015-3151-6

Two-Step SPD Processing of a Trimodal Al-Based Nano-Composite

Yuzheng Zhang, Shima Sabbaghianrad, Hanry Yang, Troy Topping, Terence Langdon, Enrique Lavernia, Julie Schoenung Steven Nutt

Metallurgical and materials transactions. A, Physical metallurgy and materials science, Vol.46(12), pp.5877-5886

12/2015

: https://doi.org/10.1007/s11661-015-3151-6

https://hdl.handle.net/20.500.12741/rep:4183

Characterization and Evaluation of Materials

Material Science

Metallic Materials

Structural Materials

Surfaces and Interfaces, Thin Films

Nanotechnology

An ultrafine-grained (UFG) aluminum nano-composite was fabricated using two severe plastic deformation steps: cryomilling of powders (and subsequent consolidation of blended powders by forging) followed by high-pressure torsion (HPT). The forged bulk composite featured a trimodal structure comprised of UFG, coarse grain (CG) regions, and ceramic particles. The additional HPT processing introduced finer grain sizes and altered the morphology and spatial distribution of the ductile CG regions. As a result, both strength and ductility increased substantially compared to those of the Al nano-composite prior to HPT. The increases were attributed to the more optimal shape and spacing of the CG regions which promoted uniform elongation and yielding during tensile loading. Microstructural changes were characterized at each processing step to establish the evolution of microstructure and to elucidate structure-property relationships. The toughening effect of the CG regions was documented via fracture analysis, providing a potential strategy for designing microstructures with enhanced strength and toughness.

: Two-Step SPD Processing of a Trimodal Al-Based Nano-Composite
: Yuzheng Zhang - Department of Chemical Engineering and Materials Science University of Southern California Los Angeles CA 90089 USA
Shima Sabbaghianrad - Department of Chemical Engineering and Materials Science University of Southern California Los Angeles CA 90089 USA
Hanry Yang - Department of Chemical Engineering and Materials Science University of California, Davis Davis CA 95616 USA
Troy Topping - Department of Mechanical Engineering California State University, Sacramento Sacramento CA 95819 USA
Terence Langdon - Materials Research Group, Faculty of Engineering and Environment University of Southampton Southampton S017 1BJ UK
Enrique Lavernia - Department of Chemical Engineering and Materials Science University of California, Davis Davis CA 95616 USA
Julie Schoenung - Department of Chemical Engineering and Materials Science University of California, Davis Davis CA 95616 USA
Steven Nutt - Department of Chemical Engineering and Materials Science University of Southern California Los Angeles CA 90089 USA
: Mechanical Engineering Department
: Springer US; New York
: 12/2015
: 99257847575701671; https://hdl.handle.net/20.500.12741/rep:4183; https://doi.org/10.1007/s11661-015-3151-6
: English