Recrystallization of nickel hardened with thorium dioxide
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Conclusions
- 1.
Dispersion-hardening nickel has exceedingly high structural stability, which explains the retention of the hardness of the cold-drawn material after annealing at high temperatures. The material is characterized by a large temperature range between recovery, occurring at 400–600°C, and recrystallization, which develops at 1200–1400°C.
- 2.
During recrystallization of dispersion-hardened nickel structural heterogeneities occur that are stable up to 1400°C (0.97Tm). The number of large recrystallized grains depends on the degree of prior deformation and the annealing temperature.
- 3.
Recrystallization processes are activated in nickel hardened with thorium dioxide as the degree of cold deformation increases. However, a relatively large degree of deformation (83%) prevents the formation of large recrystallized grains.
Keywords
Nickel Dioxide Recrystallization Thorium Structural StabilityPreview
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