1. Effect of stacking fault energy on B2 ZrCo phase transition and nanotwins formation in Zr54.5Co33.5Al12 alloy prepared by rapid solidification.
- Author
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Zhong, L.P., Feng, Z.X., Zhao, S., Tan, J., Li, C.J., Yi, J.H., and Eckert, J.
- Subjects
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PHASE transitions , *SOLIDIFICATION , *MARTENSITIC transformations , *FRACTURE strength , *X-ray diffraction - Abstract
Zr–Co–Al alloys are widely used due to their good biocompatibility and high-pressure properties. In the present work, the Zr 54.5 Co 33.5 Al 12 alloy was prepared by rapid solidification. It has been found that the central region (b region) and the edge region (d region) have obvious changes in the microstructure, with the b region contains a large number of crystalline phases, and the d region can obviously observe the morphology of the amorphous state except a few dendrites. A certain amount of amorphous is contained in the d region as detected by XRD analysis. The fracture strength can undoubtedly reach up to 2031 MPa and the fracture strain is about 1.8 %. TEM analysis revealed the B2-to-B33 phase transition in the deformed alloy, and a significant number of nanotwins with a {111} <121> type of twin relationship were observed in the B33 ZrCo phase. Furthermore, the stacking fault energy (SFE) for varying applied stresses was calculated. From the calculation results, the negative SFE (about −41 mJ/m2) is beneficial to the B2-to-B33 phase transition, and it is known that twin thickness decreases with decreasing SFE. • The negative stacking fault energy is beneficial to the B2-to-B33 phase transition. • The twin thicknesses on B33 phase decrease with a reduction in stacking fault energy. • B2-to-B33 martensitic transformation can effectively improve the mechanical properties of Zr 54.5 Co 33.5 Al 12 alloy. [ABSTRACT FROM AUTHOR]
- Published
- 2024
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