Effect of Stain Rate on Microstructure Evolution and Compressive Deformation Behavior of High-Strength Aluminum Coating Materials Fabricated by the Kinetic Spray Process

Abstract

The effects of strain rates on compressive deformation behavior and microstructure evolution of kinetic sprayed pure aluminum were investigated. The initial microstructure showed a highly deformed structure with high-dislocation density. This material exhibited higher yield strengths from 200 to 224 MPa with different strain rates and low strain rate sensitivity (0.012) compared to those of conventional pure aluminum. Strain softening occurred at lower strain rates, even at room temperature, and strain hardening at high strain rates.