Fundamental Investigation of the Microstructural Parameters to Improve Dynamic Response in Al-Cu Model System.

摘要

The objective of this project is to develop an in-depth understanding of the influence of extrinsic and intrinsic microstructural parameters on dynamic response and failure behavior of Al-Cu alloys through carefully planned and fully instrumented parametric experiments and detailed microstructural characterization at various length scales. Our ultimate goal is to understand microstructural configurations that suppress the tendency of material to shear localization in the form of adiabatic shear banding (ASB). Recognizing the fact that ballistic performance is significantly improved by delaying the onset of ASB in dynamically deforming Al alloys, our approach has the potential of providing unique guidelines for developing thermal-mechanical processing techniques to obtain high performance Al alloys applicable to army mission. Improving the fundamental understanding of how intrinsic and extrinsic parameters influence the deformation substructure and overall dynamic mechanical behavior will aid in: (1) the development of new routes to tailor microstructures that promote homogeneous strain fields and demotes premature shear localization, (2) the development of predictive constitutive models capable of accurately simulating the high strain rate deformation behavior of these materials in armor-based applications, and (3) better understanding as well as manipulation of thermoplastic heating during severe dynamic deformation processes.