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,160 d时普通基底上t-ZrO2相的σ值约为1 200 MPa,而在纳米基底上的t-ZrO2相的σ值则为1 900 MPa,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(卜ZrO2层),从而改善Zr-4合金的抗腐蚀性能.
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