The use of acoustic emission techniques to monitor fracture processes in high strength precipitation hardened aluminum alloys

Arieli, A.; Wells, R. P.; Hamstad, M. A.; Mukherjee, Amiya K.

doi:10.1016/0167-6636(83)90002-9

Cited by 1 publication

(1 citation statement)

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“…This feature is characteristic of fcc metals and reflects massive dislocation activity (and possible twinning) as the material starts to deform plastically. 38,41,42 During the later stages of deformation the AE response gradually diminishes. This observation is related to reduced mean free path of dislocations due to the formation of dislocation entangles, forest dislocations, and new high-angle grain boundaries (a result of twinning) as the materials harden.…”

Section: Resultsmentioning

confidence: 99%

The Effect of γ″ and δ Phase Precipitation on the Mechanical Properties of Inconel 718 Manufactured by Selective Laser Melting: An In Situ Neutron Diffraction and Acoustic Emission Study

Čapek

Polatidis

Knapek

et al. 2020

JOM

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The deformation behavior of additively manufactured Alloy 718 in as-built condition and after annealing was studied in situ under tensile loading along the build direction. Pre-characterization by synchrotron X-ray diffraction and electron microscopy revealed a significant amount of γ″ precipitates in the as-built samples, whereas the γ″ phase was entirely consumed and needle-like δ precipitates appeared in the annealed sample. In situ neutron diffraction (ND) and acoustic emission (AE) enabled indirect observation of the role of the precipitates on the mechanical behavior. ND provided information on the load accommodation in the matrix, while AE detected a strong signal from the interaction of dislocations with the δ-phase precipitates during deformation of the annealed samples. The results imply that in the annealed samples the matrix sheds the load to the precipitates, while in the as-built material the matrix bares a significant load.

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Section: Resultsmentioning

confidence: 99%