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Spall fracture in additive manufactured tantalum

Journal Article · · Journal of Applied Physics
DOI:https://doi.org/10.1063/1.5063930· OSTI ID:1489965

In this work, we present a series of experiments on the response of additive manufactured (AM) tantalum to dynamic loading, specifically the spall strength. Rectangular plates of AM tantalum were produced, with subsequent characterization revealing a highly anisotropic microstructure. Samples were taken from these plates to investigate the effect of anisotropy on the spall strength: the resistance to high strain-rate tensile damage. A conventional, wrought tantalum sample, possessing an equiaxed microstructure, was also tested to serve as a control. Additionally, shock loading was performed via light gas-gun flyer-plate impact experiments, with laser velocimetry on the rear of the samples to record the shock wave profiles and soft-recovery techniques to allow post-mortem analysis. In general, the AM samples were found to have a higher Hugoniot elastic limit, the dynamic yield strength under shock loading, while having a reduced spall strength, when compared to the wrought tantalum samples.

Research Organization:
Los Alamos National Laboratory (LANL)
Sponsoring Organization:
USDOE National Nuclear Security Administration (NNSA); Laboratory Directed Research and Development (LDRD)
Grant/Contract Number:
89233218CNA000001; AC52-06NA25396
OSTI ID:
1489965
Report Number(s):
LA-UR-18-29361
Journal Information:
Journal of Applied Physics, Journal Name: Journal of Applied Physics Journal Issue: 22 Vol. 124; ISSN 0021-8979
Publisher:
American Institute of Physics (AIP)Copyright Statement
Country of Publication:
United States
Language:
English

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Understanding and predicting damage and failure at grain boundaries in BCC Ta journal October 2019

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