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新鋯合金氧化膜微觀組織結(jié)構(gòu)的研究
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TL341 TG146.414

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Study on Microstructure of Oxide Film for New Zirconium Alloys
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    摘要:

    研究了氧化膜的微觀組織結(jié)構(gòu)，研究結(jié)果表明，對采用不同熱處理的兩種新鋯合金，無論從內(nèi)到外，氧化膜結(jié)構(gòu)均極為相似；不同熱處理對氧化膜結(jié)構(gòu)影響在于是否有第二相易于嵌入ZrO2中，累計退火參數(shù)值越高，嵌入可能性大；該嵌入的沉淀相促進(jìn)氧化膜化膜從其它結(jié)構(gòu)到單斜結(jié)構(gòu)的轉(zhuǎn)變，殘留于原金屬晶界處的第二相促使晶界開裂。靠近氧化膜金屬基體氧化膜內(nèi)表面觀察表明，氧化膜生長是不均勻的，呈菜花狀；腐蝕速率越高，菜花尺寸越大，凸起越嚴(yán)重。本研究說明，采用低溫加工工藝獲得尺寸較小的沉淀相是合金耐蝕性能改善的基本途徑。

    Abstract:

    The microstructure of oxide film for new zirconium alloys was studied.The results show that the microstructure of oxide films is much alike from inner surface to outer surface for NZ2 and NZ8 alloys by different intermidiate annealling treatment.The effect of different annealling lies in that whether there are precipitates embedding in oxide,the higher the accumulative annealing parameters,the more the probability of precipitates embedding.The embedded precipitates promote oxide transition to monoclinal structure and promote cracking along the former alloys grain boundary.SEM shows that the oxide film grows in a inhomogeneous way.The film in the inner surface appears in morphology like Cauliflouer,which is realted to accelerating corrosion.The faster the corrosion,the bigger the "Cauliflower"in size is.The results obtained by this study comfirm that adopting low temperature working process can make further refining of precipitates size,and this is the effective way to improve corrosion resistance of new zirconium alloys.

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李中奎 劉建章 等.新鋯合金氧化膜微觀組織結(jié)構(gòu)的研究[J].稀有金屬材料與工程,2002,(4):261~265.[Li Zhongkui, Liu Jianzhang, Zhou Lian, Li Cong, Zhang Jianjun. Study on Microstructure of Oxide Film for New Zirconium Alloys[J]. Rare Metal Materials and Engineering,2002,(4):261~265.]
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  • 最后修改日期:2001-12-13
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