Journal
MATERIALS CHARACTERIZATION
Volume 194, Issue -, Pages -Publisher
ELSEVIER SCIENCE INC
DOI: 10.1016/j.matchar.2022.112437
Keywords
Heterogeneous structure; Cold rolling (CR); Mechanical properties; Hetero-deformation induced (HDI) stress; Texture
Categories
Funding
- National Natural Science Foundation of China
- Basic Research Foundation of Yunnan Province for Young Scientists
- Yunnan Science and Technology Program
- [51664033]
- [51911540072]
- [51861015]
- [202001AU070081]
- [2019IC004]
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This study demonstrates the production of a heterogeneous structure in pure Zr, which exhibits high strength and improved ductility. The heterostructured Zr is characterized by abundant ultrafine grains and significant hetero-deformation induced strengthening, leading to a superior combination of strength and ductility.
Grain refinement always provides a high strength of metals and alloys but this is accompanied by a remarkable deterioration of ductility. Here we report a pure Zr with a heterogeneous structure, characterized by recrystallized coarse grains embedded in the ultrafine-grained matrix, which is produced by rolling at room temperature and subsequent partial recrystallization. The results show that the heterostructured Zr exhibits a superior combination of high strength and improved ductility and higher strain hardening than its coarse-grained counterparts. In terms of the high strength of heterostructured Zr, it is ascribed to the abundant ultrafine grains and significant hetero-deformation induced strengthening. Whereas good ductility is derived from the dislocation hardening of recrystallized coarse grains, the hetero-deformation induced hardening, and the sharp (0002) basal texture. The present study can contribute to understanding the essence of a desirable combination of strength and ductility of heterostructured materials.
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