Heterostructured bulk aluminum with controllable gradient structure: Fabrication strategy and deformation mechanisms

We explore the deformation features and mechanisms of bulk gradient aluminum. A powder assembly approach was employed, for the first time, to fabricate bulk aluminum with finely tuned gradient cycles. We found that the deformation behaviors of individual components are affected by the gradient structure, which is attributed to the hetero-deformation induced internal stress. Our experimental and modelling results further reveal that the hardening of each component is gradient magnitude dependent, and is governed by the distribution of geometrically necessary dislocations. Our work provides new insights into the understanding and development of gradient metals with superior properties. (C) 2021 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.

Automated summary

The deformation features of bulk gradient aluminum were explored, indicating that the deformation behaviors of individual components are affected by the gradient structure. The hardening of each component is gradient magnitude dependent and governed by the distribution of geometrically necessary dislocations. This study provides new insights for understanding and developing gradient metals with superior properties.