Journal
MATERIALS
Volume 15, Issue 21, Pages -Publisher
MDPI
DOI: 10.3390/ma15217687
Keywords
Cu-Zn alloy; gradient structure; microstructure; ductility
Categories
Funding
- Fundamental Research Funds for the Central Universities of China [B210202094]
- Chinese Jiangsu Specially appointed Professor Research Grant [HHU 2016B1203507]
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In this study, a thick GS surface layer with a thickness of 1.1 mm was successfully produced in Cu-38 wt.% Zn alloy using ultrasonic severe surface rolling technology. The results show that the volume fraction of the GS surface layer can be tailored to achieve a balance between strength and ductility in the alloy.
A gradient structure (GS) design is a prominent strategy for strength-ductility balance in metallic materials, including Cu alloys. However, producing a thick GS surface layer without surface damage is still a challenging task limited by the available processing technology. In this work, a gradient structure (GS) surface layer with a thickness at the millimeter scale is produced in the Cu-38 wt.% Zn alloy using ultrasonic severe surface rolling technology at room temperature. The GS surface layer is as thick as 1.1 mm and involves the gradient distribution of grain size and dislocation density. The grain size is refined to 153.5 nm in the topmost surface layer and gradually increases with increasing depth. Tensile tests indicate that the single-sided USSR processed alloy exhibits balanced strength (467.5 MPa in yield strength) and ductility (10.7% in uniform elongation). Tailoring the volume fraction of the GS surface layer can tune the combination of strength and ductility in a certain range. The high strength of GS surface layer mainly stems from the high density of grain boundaries, dislocations and dislocation structures, deformation twins, and GS-induced synergistic strengthening effect. Our study elucidates the effect of the thick GS surface layer on strength and ductility, and provides a novel pathway for optimizing the strength-ductility combination of Cu alloys.
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