Crack propagation in AA3xxx during deep drawing investigated using a combined TKD/dictionary indexing approach

Autor: Marc De Graef, Josh Kacher, Anastasia Mullins, Yung Suk Jeremy Yoo, DaeHoon Kang, Saransh Singh, Richard Gary Hamerton, Das Sazol Kumar
Rok vydání: 2021
Předmět:
Zdroj: Journal of Materials Research. 36:2754-2762
ISSN: 2044-5326
0884-2914
DOI: 10.1557/s43578-021-00164-y
Popis: The influence of dispersoids and grain boundary characteristics on the crack propagation behavior in AA3xxx during deep drawing has been investigated using scanning transmission electron microscopy, energy-dispersive spectroscopy, and the dictionary indexing method applied to transmission Kikuchi diffraction (TKD) patterns. Observations showed that cracks formed on the surface of the material at the earliest stages of deformation and lengthened with increasing deformation. Subsurface analysis showed that the cracks propagated from the surface and bifurcated as they extended deeper into the material, forming branches. All of the observed cracks followed intergranular paths with bifurcations correlating with triple junction locations, but no strong trends were found relating grain boundary characteristics to the crack propagation pathway. Dispersoids located at the grain boundaries were found where cracks terminated, suggesting that dispersoids arrest crack propagation and divert crack growth pathways. This paper demonstrates the first practical application of combining the dictionary indexing method with TKD analysis.
Databáze: OpenAIRE
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