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(Ce-La)-Ni-Al系塊體非晶合金的玻璃形成能力及熱穩(wěn)定性
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Glass-Forming Ability and Thermal Stability of (Ce-La)-Ni-Al Bulk Amorphous Alloys
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    摘要:

    通過尋找共晶點(diǎn)成分和相似元素替代的方法開發(fā)(Ce-La)-Ni-Al系非晶合金，并采用銅模吸鑄法制備出直徑不小于5 mm的完全非晶態(tài)合金。利用X 射線衍射儀確定合金的結(jié)構(gòu)，用差示掃描量熱儀(DSC)對(duì)非晶合金的玻璃轉(zhuǎn)變、晶化和熔化行為進(jìn)行了研究。結(jié)果表明，La的添加極大地提高了Ce-Ni-Al三元非晶合金的玻璃形成能力和熱穩(wěn)定性。研究中用熱力學(xué)模型解釋了這種變化的原因。與Ce-Ni-Al三元非晶合金相比，物理化學(xué)性能都相似的Ce、La兩個(gè)稀土元素的共存增加了體系的混亂度，導(dǎo)致系統(tǒng)熵的增加，從而降低系統(tǒng)能量，使合金的玻璃形成能力和熱穩(wěn)定性都提高

    Abstract:

    (Ce-La)-Ni-Al bulk amorphous alloys were developed by seeking the eutectic composition and similar element substitution. A series of completely amorphous alloy rods (≥5 mm in diameter) were prepared by casting the melt ingots into a water-cooled copper mould under vacuum. The structures of the alloy samples were determined by X-ray diffraction. The behaviors of glass transition, crystallization and melting were studied by differential scanning calorimetry (DSC). Results show that La addition greatly improves the glass-forming ability (GFA) and thermal stability of Ce-Ni-Al amorphous alloy. The reasons for this change were explained by a thermodynamic model. Compared with Ce-Ni-Al amorphous alloys, the coexistence of Ce and La, which have similar physical and chemical properties, increases the confusion degree and the entropy of the corresponding alloys; consequently it decreases the Gibbs free energy and thus increases the GFA and thermal stability of the alloys

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賈元波,宋華鋒,晁 琦,王 慶,董遠(yuǎn)達(dá).(Ce-La)-Ni-Al系塊體非晶合金的玻璃形成能力及熱穩(wěn)定性[J].稀有金屬材料與工程,2010,39(6):997~1001.[Jia Yuanbo, Song Huafeng, Chao Qi, Wang Qing, Dong Yuanda. Glass-Forming Ability and Thermal Stability of (Ce-La)-Ni-Al Bulk Amorphous Alloys[J]. Rare Metal Materials and Engineering,2010,39(6):997~1001.]
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  • 收稿日期:2009-06-22
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