2025-05-01 カリフォルニア大学アーバイン校（UCI）
Penghui Cao and Hangman Chen / UC Irvine
＜関連情報＞
- https://news.uci.edu/2025/05/01/uc-irvine-researchers-challenge-model-governing-deformation-of-materials-under-stress/
- https://www.nature.com/articles/s41467-025-58480-4
CrCoNi合金におけるスリップバンドの分岐的進化 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 & Penghui Cao
Nature Communications Published:16 April 2025
DOI:https://doi.org/10.1038/s41467-025-58480-4
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.
