Adiabatic shear failure of high reinforcement content aluminum matrix composites

• Published in: Journal of materials science 2008-07, Vol.43 (13), p.4483-4486
• Main Authors: Wu, G. H., Zhu, D. Z., Chen, G. Q., Jiang, L. T., Zhang, Q.
• Format: Article
• Language: English
• Subjects: Adiabatic flow; Aluminum base alloys; Aluminum matrix composites; Characterization and Evaluation of Materials; Chemistry and Materials Science; Classical Mechanics; Cross-disciplinary physics: materials science; rheology; Crystallography and Scattering Methods; Edge dislocations; Exact sciences and technology; Failure; Heat treating; Materials Science; Other topics in materials science; Phase transitions; Physics; Plastic deformation; Polymer matrix composites; Polymer Sciences; Shear bands; Shearing; Solid Mechanics; Split Hopkinson pressure bars; Strain hardening; Titanium diboride; Yield strength
• ISSN: 0022-2461; 1573-4803
• DOI: 10.1007/s10853-008-2652-8

Dynamic failure behaviors of high reinforcement content TiB 2 /Al composites were experimentally investigated using split Hopkinson pressure bar (SHPB). The TiB 2 /Al composites showed high flow stresses and good plastic deformation ability at high strain rates. Adiabatic temperature rise decreased the flow stresses of TiB 2 /Al composites, which was verified by the prediction of Johnson–Cook model. While the predictions by Cowper–Symonds model exhibited obvious strain hardening characteristic, the values of which were much higher than those of the Johnson–Cook model and the experimental. The composites were failed macroscopically in brittle fracture and some phase transformation bands were found on the shearing surfaces. The dynamic failure behavior of TiB 2 /Al composites was predominated by the formation of adiabatic shear bands.