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Size Effect of Thermal Stability of Zr47Ti12.9Cu11Ni9.6 -Be16.7Nb2.8 Metallic Glass
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Size Effect of Thermal Stability of Zr47Ti12.9Cu11Ni9.6 -Be16.7Nb2.8 Metallic Glass
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National Natural Science Foundation of China (51071018, 51271018)

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    摘要:

    采用真空銅模吸鑄和單輥真空薄帶技術(shù)制備出直徑5 mm的Zr47Ti12.9Cu11Ni9.6Be16.7Nb2.8金屬玻璃棒材和相同成分厚30 μm的金屬玻璃薄帶。利用熱分析技術(shù)和Kissinger方法分析計(jì)算了不同尺寸金屬玻璃的熱穩(wěn)定性參數(shù)，主要包括：玻璃轉(zhuǎn)變溫度Tg，晶化溫度Tx，玻璃轉(zhuǎn)變和晶化激活能Eg、Ex等。結(jié)果表明：Zr47Ti12.9Cu11Ni9.6Be16.7Nb2.8金屬玻璃在熱穩(wěn)定性上表現(xiàn)出“越小越穩(wěn)定”的特征，薄帶的熱穩(wěn)定性參數(shù)均高于棒材，表現(xiàn)出更好的熱穩(wěn)定性。不同尺寸Zr47Ti12.9Cu11Ni9.6Be16.7Nb2.8金屬玻璃的晶化行為進(jìn)一步驗(yàn)證了這一特征：在晶化溫度遠(yuǎn)低于金屬玻璃薄帶情況下，棒材卻更易晶化，晶化過程中獲得了比金屬玻璃薄帶更加完整的晶化組織

    Abstract:

    The bulk glassy cylinders with a diameter of 5 mm and the ribbons of 30 μm in thickness of Zr47Ti12.9Cu11Ni9.6Be16.7Nb2.8 metallic glass were prepared by suction casting and melt spinning，respectively. The thermal stability parameters such as glass transition temperature Tg, onset crystallization temperature Tx, glass transition and crystallization activation energies Eg, Ex, etc., were measured by Differential Scanning Calorimetry and the Kissinger equation. The results reveal that the thinner ribbon sample has higher thermal stability and the metallic glass exhibits a “the smaller, the more stable” characteristic. The crystallization behaviors of different size samples also verify the above mentioned characteristic further: in the case of the crystallization of the bulk cylinder being lower than that of the glassy ribbon, the cylinder is crystallized more easily, and its crystallization microstructure is more integral than that of the glassy ribbon.

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王美玲,惠希東,馮 強(qiáng),陳國良. Size Effect of Thermal Stability of Zr47Ti12.9Cu11Ni9.6 -Be16.7Nb2.8 Metallic Glass[J].稀有金屬材料與工程,2013,42(11):2217~2221.[Wang Meiling, Hui Xidong, Feng Qiang, Chen Guoliang. Size Effect of Thermal Stability of Zr47Ti12.9Cu11Ni9.6 -Be16.7Nb2.8 Metallic Glass[J]. Rare Metal Materials and Engineering,2013,42(11):2217~2221.]
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  • 收稿日期:2012-11-18
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