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表面納米化Zr-4合金組織和性能熱穩(wěn)定性研究
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陜西省自然科學(xué)基礎(chǔ)研究計劃青年人才項目(2009JQ6008)；陜西省教育廳專項計劃項目(08JK317)


Thermal Stabilities of Microstructures and Properties of Surface Nanocrystallized Zr-4 Alloy
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教育部科學(xué)技術(shù)研究重點項目(108026)；科學(xué)技術(shù)部國際科技合作計劃項目(2006DFB51260)

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    摘要:

    采用表面機械研磨法(SMAT)對Zr-4合金進(jìn)行處理，在其表面制備出納米結(jié)構(gòu)表層，并在不同溫度下對其進(jìn)行退火。利用偏光顯微鏡、X射線衍射儀、透射電鏡、顯微硬度計和電化學(xué)測量儀等分析手段，研究了SMAT處理Zr-4合金經(jīng)不同溫度退火后，其納米表層組織、硬度的熱穩(wěn)定性，以及退火對耐腐蝕性能的影響。結(jié)果表明，SMAT處理Zr-4合金經(jīng)低于350℃退火，其表層納米晶組織、晶粒尺寸、顯微硬度具有一定的熱穩(wěn)定性；Zr-4合金經(jīng)SMAT處理實現(xiàn)表面納米化后，其在1 mol/L H2SO4溶液中的耐腐蝕性能降低，進(jìn)一步對其在低于350 ℃進(jìn)行退火，其耐腐蝕性能得到改善，且退火后的耐腐蝕性能要優(yōu)于原始未經(jīng)SMAT處理的Zr-4合金

    Abstract:

    Nanostructured surface layer was synthesized on Zr-4 alloy surface by surface mechanical attrition treatment (SMAT), and then the alloy was annealed at different temperatures in vacuum. The effects of the annealing temperature on the thermal stabilities of microstructure and hardness, and the effect of annealing on corrosion resistance were investigated by means of optical microscope, X-ray diffraction, the transmission electron microscope, microhardness test and electrochemical testing. The results show that when the annealing temperature is below 350 oC, the microstructure, grain size and microhardness of surface nanocrystallized Zr-4 alloy have good thermal stability. The corrosion resistance in 1 mol/L H2SO4 solution for the alloy only after SMAT is decreased. However, after further annealing below 350 oC, its corrosion resistance is improved, which is better than that of Zr-4 alloy without SMAT treatment

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張聰惠,何曉梅,蘭新哲,劉大利.表面納米化Zr-4合金組織和性能熱穩(wěn)定性研究[J].稀有金屬材料與工程,2010,39(12):2232~2236.[Zhang Conghui, He Xiaomei, Lan Xinzhe, Liu Dali. Thermal Stabilities of Microstructures and Properties of Surface Nanocrystallized Zr-4 Alloy[J]. Rare Metal Materials and Engineering,2010,39(12):2232~2236.]
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  • 收稿日期:2010-05-06
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