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系统地研究了不同加工工艺对Zr-1Nb-0.01Cu合金第二相粒子析出行为的影响。结果表明,随着冷轧和退火次数减少、中间退火温度和最终退火温度降低与时间的缩短,第二相粒子的平均晶粒尺寸在减小。在温度高于640℃的中间退火过程中形成的β-Zr相在最终的退火过程中很难完全分解。由于Ostwald熟化效应,最终退火时间的延长会导致合金中尺寸较小的第二相粒子通过原子扩散合并成尺寸较大的第二相粒子。与其它加工工艺相比,降低中间退火温度在减小第二相粒子尺寸方面更为有效。通过低温中间/最终退火(≤520℃)或缩短退火时间(≤2 h)可获得平均晶粒尺寸小于50 nm的第二相粒子。研究结果对调控Zr-Nb系合金第二相粒子的析出行为具有重要意义。
The effects of different processing technologies on the precipitation behavior of the second phase particles of Zr-1Nb-0.01Cu alloy were investigated systematically. The results show that the average grain size of the second phase particles decreases as the number of cold rolling and annealing decreases, the intermediate annealing temperature and the final annealing temperature decrease, and the time decreases. The β-Zr phase formed during the intermediate annealing at a temperature higher than 640 ° C hardly decomposes completely in the final annealing. Due to the Ostwald ripening effect, the extension of the final annealing time results in the second smaller phase particles in the alloy being incorporated into the larger second phase particles by atomic diffusion. Reducing the intermediate annealing temperature is more effective in reducing the size of the second-phase particles than other processing techniques. Second phase particles with an average crystal grain size of less than 50 nm can be obtained by a low temperature intermediate / final annealing (≤520 ° C) or a shortened annealing time (≤2 h). The research results are of great significance for controlling the precipitation behavior of the second phase particles of the Zr-Nb alloy.