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研究纳米组织与普通粗晶组织Zr-4合金在400℃水腐蚀过程中氧化膜内应力的演变特征。结果表明,纳米基底上形成的单斜相ZrO2(m-ZrO2)和四方相ZrO2(t-ZrO2)的微观应变值,比普通基层上形成的m-ZrO2和t-ZrO2相的微观应变值大,160d时普通基底上t-ZrO2相的σ值约为1200MPa,而在纳米基底上的t-ZrO2相的σ值则为1900MPa,说明表面纳米化处理后Zr-4合金氧化膜内,氧化膜/金属界面(O/M界面)处所受的压应力比普通组织的O/M界面所受的压应力大。纳米化后均匀细小的晶粒尺度以及高的压应力,有利于在O/M界面处形成一层具有保护作用的致密的腐蚀产物膜(t-ZrO2层),从而改善Zr-4合金的抗腐蚀性能。
The evolution of internal stress in the oxide film during the corrosion of water at 400 ℃ was studied. The results show that the microstrain values of monoclinic ZrO2 (m-ZrO2) and tetragonal ZrO2 (t-ZrO2) formed on the nanostructure are larger than those of m-ZrO2 and t-ZrO2 , The σ value of t-ZrO2 phase on ordinary substrate is about 1200MPa at 160d, and the σ value of t-ZrO2 phase on the nano-substrate is 1900MPa, indicating that the surface oxide film of the Zr-4 alloy oxide film / Metal interface (O / M interface) at the compressive stress suffered by ordinary O / M interface than the compressive stress. The uniform and fine grain size and high compressive stress after the nanocrystallization facilitate the formation of a dense corrosion product film (t-ZrO2 layer) at the O / M interface to improve the resistance of the Zr-4 alloy Corrosion performance.