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Nb添加對(duì)Cu-Zr非晶合金等溫晶化動(dòng)力學(xué)的影響
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Effect of Nb Addition on Isothermal Crystallization Kinetics of Cu-Zr Bulk Amorphous Alloys
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    摘要:

    采用銅模吸鑄法制備了Cu50.3Zr49.7-xNbx(x=0, 2)塊體非晶合金。利用示差掃描量熱分析（DSC）研究了2at%Nb的添加對(duì)Cu-Zr非晶合金在過(guò)冷液相區(qū)等溫晶化行為的影響。結(jié)果顯示Cu基合金的等溫晶化動(dòng)力學(xué)符合JMA方程的定量描述。含微量Nb的合金具有更長(zhǎng)的晶化孕育時(shí)間、更寬的反應(yīng)放熱峰以及更低晶化速率常數(shù)k和Avrami指數(shù)n，與此同時(shí)局域Avrami指數(shù)n隨晶化體積分?jǐn)?shù)的變化和Nb的添加而改變。這表明微量Nb添加在抑制合金形核，提高其熱穩(wěn)定性的同時(shí)，也改變了Cu基合金的等溫晶化過(guò)程。

    Abstract:

    Cu50.3Zr49.7-xNbx(x=0, 2) bulk amorphous alloys were prepared by copper mould suction casting. The effect of 2at% Nb addition on isothermal crystallization behavior of the Cu-Zr alloy in supercooled liquid region has been investigated by differential scanning calorimetry (DSC). Results show that the kinetics of isothermal crystallization of Cu based alloys can be well described by the Johnson-Mehl-Avrami (JMA) model. The minor-Nb-containing alloy exhibits longer incubation time for isothermal crystallization and broader reaction exothermic peak as well as lower crystallization rate constant k and Avrami parameter n. Meanwhile, the variation of local Avrami parameter n with crystallized fraction in the Nb-containing alloy is different from that of Nb-free one. This indicates that the Nb addition enhances the thermal stability against crystallization and changes the isothermal crystallization process of the Cu-based alloy.

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宋華鋒,王 慶,付 濤,方 祺,董遠(yuǎn)達(dá). Nb添加對(duì)Cu-Zr非晶合金等溫晶化動(dòng)力學(xué)的影響[J].稀有金屬材料與工程,2011,40(12):2131~2135.[Song Huafeng, Wang Qing, Fu Tao, Fang Qi, Dong Yuanda. Effect of Nb Addition on Isothermal Crystallization Kinetics of Cu-Zr Bulk Amorphous Alloys[J]. Rare Metal Materials and Engineering,2011,40(12):2131~2135.]
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  • 收稿日期:2010-12-28
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