Divergent evolution of slip banding in CrCoNi alloys

Bijun Xie, Hangman Chen, Pengfei Wang, Cheng Zhang, Bin Xing, Mingjie Xu, Xin Wang, Lorenzo Valdevit, Julian Rimoli, Xiaoqing Pan and Penghui Cao ()
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Bijun Xie: University of California
Hangman Chen: University of California
Pengfei Wang: University of California
Cheng Zhang: University of California
Bin Xing: University of California
Mingjie Xu: University of California
Xin Wang: University of California
Lorenzo Valdevit: University of California
Julian Rimoli: University of California
Xiaoqing Pan: University of California
Penghui Cao: University of California

Nature Communications, 2025, vol. 16, issue 1, 1-11

Abstract: Abstract Metallic materials under high stress often exhibit deformation localization, manifesting as slip banding. Over seven decades ago, Frank and Read introduced the well-known model of dislocation multiplication at a source, explaining slip band formation. Here, we reveal two distinct types of slip bands (confined and extended) in compressed CrCoNi alloys through multi-scale testing and modeling from microscopic to atomic scales. The confined slip band, characterized by a thin glide zone, arises from the conventional process of repetitive full dislocation emissions at Frank–Read source. Contrary to the classical model, the extended band stems from slip-induced deactivation of dislocation sources, followed by consequent generation of new sources on adjacent planes, leading to rapid band thickening. Our findings provide insights into atomic-scale collective dislocation motion and microscopic deformation instability in advanced structural materials.

Date: 2025
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DOI: 10.1038/s41467-025-58480-4

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