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鋯基金屬玻璃中離子減薄誘導(dǎo)的微結(jié)構(gòu)變化
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Microstructure Changes in Zr-Based Metallic Glass Induced by Ion Milling
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National Natural Science Foundation of China (50601011); National Basic Research Program of China (2007CB607603); Program for NCETs in University (NCET-06-0484); NSF of Jiangsu Province (BK2006533); Fund of the State Key Laboratory of Solidification Processing in NWPU (SKLSP200905); Self-determined Research Program of Jiangnan University (JUSRP20914)

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    摘要:

    用電化學(xué)雙噴、凹坑法和離子減薄制備了4組Zr52.5Cu17.9Ni14.6Al10Ti5金屬玻璃的透射電子顯微鏡樣品。透射電鏡觀測(cè)表明，電子透明區(qū)域的微結(jié)構(gòu)隨采用的離子減薄條件變化敏感。通過(guò)對(duì)比選區(qū)電子衍射花樣和相同成分樣品等溫退火的X衍射花樣發(fā)現(xiàn)，在一些嚴(yán)重依賴于離子減薄制備的電鏡樣品中存在顯著的加熱效應(yīng)，導(dǎo)致在離子減薄區(qū)域形成了不同的有序結(jié)構(gòu)。在那些特意使用長(zhǎng)時(shí)間減薄的樣品中，可達(dá)到約780 K的局域峰值溫度，遠(yuǎn)遠(yuǎn)超過(guò)了該成分的玻璃轉(zhuǎn)變溫度。這個(gè)結(jié)果表明，在用離子減薄獲得非晶合金的電鏡樣品時(shí)，必須注意減薄過(guò)程所誘導(dǎo)的潛在的微結(jié)構(gòu)變化，以避免得到錯(cuò)誤的判斷

    Abstract:

    Four groups of transmission electron microscopy (TEM) specimens of Zr52.5Cu17.9Ni14.6Al10Ti5 metallic glass were prepared by double-jet electropolishing, dimpling and ion milling. TEM observations indicate that the microstructures in electron-transparent areas change sensitively with ion milling conditions. Detailed comparisons between the selected area electron diffraction patterns of TEM specimens and the X-ray diffraction patterns of thermally annealed samples of the same composition show that significant heating effects exist in some severe milling processes, resulting in the formation of various ordered structures in thin areas. In TEM specimens prepared by intentionally long time ion milling, the peak temperature locally reached is estimated as high as 780 K, far above the glass transition temperature of this metallic glass. The results suggest that precautions must be taken to prepare TEM specimens of amorphous alloys by ion milling, particularly when the induced microstructure changes may lead to invalid judgments

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顧曉峰,郝衛(wèi)娟,王 軍,寇宏超,李金山.鋯基金屬玻璃中離子減薄誘導(dǎo)的微結(jié)構(gòu)變化[J].稀有金屬材料與工程,2010,39(10):1693~1696.[Gu Xiaofeng, Hao Weijuan, Wang Jun, Kou Hongchao, Li Jinshan. Microstructure Changes in Zr-Based Metallic Glass Induced by Ion Milling[J]. Rare Metal Materials and Engineering,2010,39(10):1693~1696.]
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  • 收稿日期:2009-10-27
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