Dislocation Mechanics of High-Rate Deformations

• Published in: Metallurgical and materials transactions. A, Physical metallurgy and materials science Vol. 46; no. 10; pp. 4438 - 4453
• Main Authors: Armstrong, Ronald W., Li, Qizhen
• Format: Journal Article
• Language: English
• Published: New York Springer US 01.10.2015; Springer Nature B.V
• Subjects: Adiabatic flow; Characterization and Evaluation of Materials; Chemistry and Materials Science; Compressive strength; Constitutive relationships; Deformation; Dislocations; Materials Science; Metallic Materials; Metallurgy; Metals; Nanomaterials; Nanostructure; Nanotechnology; Physical metallurgy; Plastic deformation; Plastics; Structural Materials; Surfaces and Interfaces; Symposium: Dynamic Behavior of Materials VI; Thin Films; Dislocation Generation; Deformation Twinning; Strain Rate Dependence; Shear Banding; Adiabatic Shear Banding
• ISSN: 1073-5623; 1543-1940
• DOI: 10.1007/s11661-015-2779-6

Four topics associated with constitutive equation descriptions of rate-dependent metal plastic deformation behavior are reviewed in honor of previous research accomplished on the same issues by Professor Marc Meyers along with colleagues and students, as follow: (1) increasing strength levels attributed to thermally activated dislocation migration at higher loading rates; (2) inhomogeneous adiabatic shear banding; (3) controlling mechanisms of deformation in shock as compared with shock-less isentropic compression experiments and (4) Hall–Petch-based grain size-dependent strain rate sensitivities exhibited by nanopolycrystalline materials. Experimental results are reviewed on the topics for a wide range of metals.