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Zr-4合金中氫化物析出長大的透射電鏡原位研究
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國家自然科學(xué)基金（50871064）；上海市重點(diǎn)學(xué)科建設(shè)項(xiàng)目（S30107）


In Situ Investigation of Hydride Precipitation and Growth in Zircaloy-4 by Transmission Electron Microscopy
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    摘要:

    用透射電子顯微鏡拉伸試樣臺原位研究了應(yīng)力、電子束輻照以及第二相對Zr-4合金中氫化物析出和長大的影響。結(jié)果表明，在拉應(yīng)力作用下，裂紋易于沿氫化物擴(kuò)展，并在裂尖垂直于拉應(yīng)力方向析出新的氫化物。氫化物在拉應(yīng)力誘發(fā)下的析出、開裂、再析出·····過程，導(dǎo)致了氫致延遲開裂。在較強(qiáng)的會聚電子束輻照下，Zr-4 合金中的氫化物會分解，新的氫化物會圍繞著附近的Zr(Fe,Cr)2第二相粒子析出，新析出的氫化物為面心立方結(jié)構(gòu)的δ相。

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    The effects of stress, electron beam irradiation and second phase particles on zirconium hydride precipitation and growth in Zircaloy-4 were investigated using in-situ transmission electron microscope observation. Results show that with the tensile stress the cracks are likely to propagate along hydrides and new hydrides are formed at the crack tip along the vertical direction of the applied stress. A process of precipitation, cracking, re-precipitation and so on, induced by tensile stress, causes delayed hydride cracking (DHC). Under the high irradiation of converged electron beam, the hydrides decompose in the Zircaloy-4, and new hydrides prefer to precipitate around the unoxidized Zr(Fe, Cr)2 particles, and the re-precipitated hydrides are fcc-structure δ phase.

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彭劍超,李 強(qiáng),劉仁多,姚美意,周邦新. Zr-4合金中氫化物析出長大的透射電鏡原位研究[J].稀有金屬材料與工程,2011,40(8):1377~1381.[Peng Jianchao, Li Qiang, Liu Renduo, Yao Meiyi, Zhou Bangxin. In Situ Investigation of Hydride Precipitation and Growth in Zircaloy-4 by Transmission Electron Microscopy[J]. Rare Metal Materials and Engineering,2011,40(8):1377~1381.]
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  • 收稿日期:2010-08-27
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