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OALib Journal期刊
ISSN: 2333-9721
费用：99美元
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Cu-Zr-Nb系铜基块体非晶合金的形成
, PP. 999-1003
Keywords: 块体非晶合金,Cu-Zr-Nb合金,原子团簇
Abstract:
Cu8Zr3和Cu10Zr7相中存在Cu8Zr5和Cu6Zr5团簇结构，它们与Cu-Zr系的两个深共晶点Cu61.8Zr38.2和Cu56Zr44对应.Cu64Zr36是Cu-Zr二元系具有最大玻璃形成能力的成分点.依据形成块体非晶的“变电子浓度线判据”，以Cu64Zr36,Cu61.8Zr38.2和Cu56Zr443个二元成分为出发点，以Nb元素为第三组元，建立变电子浓度线(Cu64Zr36)100-xNbx,(Cu61.8Zr38.2)100-xNbx和(Cu56Zr44)100-xNbx.采用分步熔炼法，由铜模吸铸法制备直径为3mm的合金棒.块体非晶的玻璃形成区及玻璃形成能力由XRD和热分析确定.结果表明,添加少量Nb(原子分数,x≤3)可以显著提高Cu-Zr二元系的玻璃形成能力.具有最大Tg/Tl值(0.626)的成分Cu60.3Zr37.2Nb2.5位于具有Cu8Zr5团簇和最深共晶点的Cu61.8Zr38.2向第三组元Nb的连线上.结合Cu-Zr二元体系的团簇结构讨论了Cu-Zr-Nb系块体非晶的形成.
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