Modifications of the Response of Materials to Shock Loading by Age Hardening

Abstract

The shock response of two age-hardened alloys, aluminum 6061 and copper-2 wt pct beryllium (CuBe), has been investigated in terms of their microstructual state; either solution treated or age hardened. While age hardening induces large increases in strength at quasi-static strain rates, age hardening does not produce the same magnitude of strength increase during shock loading. Examination of the shocked microstructures (of 6061) indicates that the presence of a fine distribution of precipitates throughout the microstructure hinders the motion and generation of dislocations and hence reduces the strain-rate sensitivity of the aged material, thus allowing the properties of the solution-treated state to approach those of the aged. It has also been observed that the shear strength of solution-treated CuBe is near identical to that of pure copper. It is suggested that this is the result of two competing processes; large lattice strains as beryllium substitutes onto the copper lattice inducing a high degree of solution strengthening acting against a reduction in shear strength caused by twinning in the alloy.

Effect of Thermal Exposure Simulating Vapor Deposition on the Impact Behavior of Additively Manufactured AlSi10Mg Alloy

“…The T5 and T6-like materials presented a significant difference in hardness, but a similar change is not evident in the impact strengths. This discrepancy between different material conditions in terms of hardness and impact strength was previously reported in the literature and ascribed to different strain-rate sensitivities ( Ref 26,40). Further in-depth microstructural investigations are required for a comprehensive description of this phenomenon.…”

A flux-enriched Godunov method for multi-material problems with interface slide and void opening

“…The fracture components of the method are validated in one dimension using an experimental spallation test from Millett [42]. In this test, a block of aluminium alloy 5083 H32 collides with a block of copper alloy CuBe TF00, causing the copper to undergo spallation fracture.…”

A Flux-enriched Godunov Method for Multi-material Problems with Interface Slide and Void Opening

“…The fracture components of the method are validated in one dimension using an experimental spallation test from Millett [35]. In this test a block of aluminium alloy 5083 H32 collides with a block of copper alloy CuBe TF00, causing the copper to undergo spallation fracture.…”