Homogenization and Growth Behavior of Second-Phase Particles in a Deformed Zr–Sn–Nb–Fe–Cu–Si–O Alloy
Abstract
:1. Introduction
2. Materials and Methods
2.1. Material Preparation
2.2. Characterizations
2.3. Corrosion Tests
3. Results and Discussion
3.1. Microstructure of the β-Quenched Sample
3.2. Microstructures of the Rolled Samples
3.3. Distribution and Growth Behavior of Second-Phase Particles after Heat Treatment
3.4. Mechanism for the Homogenization and Growth Behavior of Second-Phase Particles
3.5. Corrosion Resistance
5. Conclusions
- (1)
- A linear distribution of SPPs is presented in the quenched sample. After rolling, the distributions of SPPs in the samples are distorted to some extent, according to the deformation degree. The SPPs both in rolled samples are coarsened, spherized, and homogeneously distributed during annealing; the average diameters of the SPPs increase with increasing the deformation degree and annealing time (or temperature). Furthermore, compared with the cold-rolled–annealed samples, the emergences of the homogeneous distributions of the SPPs in the hot-rolled–annealed samples are postponed.
- (2)
- The homogenization and growth of SPPs are attributed to the Ostwald ripening mechanism. Due to the invariable volume fractions of SPPs in quenched, rolled, and annealed samples, the growth rates of SPPs are primarily governed by the diffusion rates of the substance of SPPs in the Zr matrix. Since the effective diffusion coefficient consists of the lattice diffusion and short-circuit diffusion, the sample with a higher deformation degree is speculated to have more defects in the Zr matrix, which provides more shortcuts for the mass transfer of SPPs. As a result, SPPs in the sample with a higher deformation degree grow and homogenize more easily compared with those in the sample with a lower deformation degree.
- (3)
- All the selected samples had a similar weight gain before the 100-day exposure. However, the samples with inhomogeneously distributed SPPs had a post-transition phenomenon after the 100-day exposure, whereas the transitions in corrosion kinetics of the samples with homogeneously distributed SPPs took place after the 160-day exposure. Therefore, it confirms a detrimental effect of inhomogeneously distributed SPPs on the corrosion resistance of the Zr alloys.
Author Contributions
Funding
Conflicts of Interest
References
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Chen, L.-Y.; Sang, P.; Zhang, L.; Song, D.; Chu, Y.-Q.; Chai, L.; Zhang, L.-C. Homogenization and Growth Behavior of Second-Phase Particles in a Deformed Zr–Sn–Nb–Fe–Cu–Si–O Alloy. Metals 2018, 8, 759. https://doi.org/10.3390/met8100759
Chen L-Y, Sang P, Zhang L, Song D, Chu Y-Q, Chai L, Zhang L-C. Homogenization and Growth Behavior of Second-Phase Particles in a Deformed Zr–Sn–Nb–Fe–Cu–Si–O Alloy. Metals. 2018; 8(10):759. https://doi.org/10.3390/met8100759
Chicago/Turabian StyleChen, Liang-Yu, Peng Sang, Lina Zhang, Dongpo Song, Yan-Qiu Chu, Linjiang Chai, and Lai-Chang Zhang. 2018. "Homogenization and Growth Behavior of Second-Phase Particles in a Deformed Zr–Sn–Nb–Fe–Cu–Si–O Alloy" Metals 8, no. 10: 759. https://doi.org/10.3390/met8100759