Alloying and Annealing Effects on Grain Boundary Character Evolution of Al-alloy 7075 Thin Films: An ACOM-TEM Analysis

Parajuli, Prakash; Mendoza‐Cruz, Rubén; Yacamán, Miguel José; Ponce, Arturo

doi:10.1007/978-3-030-05749-7_12

Cited by 2 publications

(1 citation statement)

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“…Similar to the prior studies on vacuum deposited metal thin films, this <111> strong texture of the film can be correlated to the preferred orientation of the Al alloy crystallites corresponding to the lower surface energy planes [21,31,42]. Overview of the GB character, i.e., grain boundary type distribution (GB contours map showing different types of GBs by unique colors and the length fraction of those GBs) and GBs connectivity (GB triple junction (TJ) distribution) are summarised in Fig.…”

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confidence: 74%

Misorientation dependence grain boundary complexions in <111> symmetric tilt Al grain boundaries

et al. 2019

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Since polycrystalline alloys consist of a complex network of various types of grain boundaries (GBs), detailed atomic-scale analysis of how some impurities are distributed at every type of GBs is necessary to fully understand the implications of GB segregation on material's performance. In this study, we present the atomic-scale structural combined with a chemical analysis of segregation induced GB complexions across the various types of Al alloy 7075 GBs using aberration-corrected microscopy and crystal orientation mapping assisted with precession electron diffraction. The result shows multilayer Cu GB segregation containing non-uniformly segregated mixed atomic columns across the interfaces. Two distinct types of Cu GB segregation behavior were observed, point and parallel array, analyzed by means of a displacement field obtained from the dichromatic pattern. Atomistic simulations were performed to test the energetic feasibility of the observed segregation behavior. As per the knowledge of the authors, this is the first report on experimental analysis of segregation induced periodic ordered structured GB complexions on Al alloy system. Furthermore, every GBs of the films were segregated uniquely forming ordered structures along the interface. The distance between two consecutive high segregated units was periodic for the point segregated GBs and followed a trend of a theoretical model of dislocation spacing. Based on the distance between two high segregated units, it is inferred that highly misorientated GBs are more segregated than low misoriented GBs. This study demonstrates that the misorientation between the neighboring grains significantly influences the segregation behavior across the interface and consequently, the structure of segregation-induced GB complexions.

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Section: Resultssupporting

confidence: 74%