Journal article
Breaking the Limit of Micro-Ductility in Oxide Glasses
Aalborg University1
Department of Mechanical Engineering, Technical University of Denmark2
Manufacturing Engineering, Department of Mechanical Engineering, Technical University of Denmark3
Materials and Surface Engineering, Department of Mechanical Engineering, Technical University of Denmark4
University of California at Los Angeles5
Oxide glasses are one of the most important engineering and functional material families owing to their unique features, such as tailorable physical properties. However, at the same time intrinsic brittleness has been their main drawback, which severely restricts many applications. Despite much progress, a breakthrough in developing ultra‐damage‐resistant and ductile oxide glasses still needs to be made.
Here, a critical advancement toward such oxide glasses is presented. In detail, a bulk oxide glass with a record‐high crack resistance is obtained by subjecting a caesium aluminoborate glass to surface aging under humid conditions, enabling it to sustain sharp contact deformations under loads of ≈500 N without forming any strength‐limiting cracks.
This ultra‐high crack resistance exceeds that of the annealed oxide glasses by more than one order of magnitude, making this glass micro‐ductile. In addition, a remarkable indentation behavior, i.e., a time‐dependent shrinkage of the indent cavity, is demonstrated. Based on structural analyses, a molecular‐scale deformation model to account for both the ultra‐high crack resistance and the time‐dependent shrinkage in the studied glass is proposed.
Language: | English |
---|---|
Publisher: | John Wiley and Sons Inc. |
Year: | 2019 |
Pages: | 1901281 |
ISSN: | 21983844 |
Types: | Journal article |
DOI: | 10.1002/advs.201901281 |
ORCIDs: | 0000-0002-5204-0755 , Zhang, Yang , Somers, Marcel A. J. , 0000-0003-4600-0631 , 0000-0002-6048-5236 and 0000-0003-0476-2021 |
Q Science crack resistance deformation glasses indentation micro‐ductility