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Effect of substitution of rare earth by mischmetal on the devitrification process of Al-X-Ni-Co (X = Y, Ce, Mm) alloys

机译:混合稀土替代稀土对Al-X-Ni-Co(X = Y,Ce,Mm)合金失透过程的影响

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摘要

The effect of substitution of Cc or Y by mischmetal (Mm) on the glass transition and the kinetics of crystallization of quaternary Al-Ni-Co-(Ce, Y, Mm) alloys was studied using isothermal and non-isothermal calorimetry and X-ray experiments. The alloy containing Mm shows more similarity to Cc containing alloy in all the studied properties than to Y containing alloy. The glass transition is less evident for Cc and Mm containing alloys than for the alloy containing Y. For the two former alloys, the first and the second crystallization stages are strongly overlapped and yield a fully crystallized alloy. Whereas for Y alloy, the first and the second stages are well resolved and the primary crystallization yields nanosized alpha-Al particles embedded in a residual amorphous matrix. (C) 2004 Elsevier B.V. All rights reserved.
机译:用等温和非等温量热法和X-等温量热法研究了混合金属(Mm)替代Cc或Y对四元Al-Ni-Co-(Ce,Y,Mm)合金的玻璃化转变和结晶动力学的影响。射线实验。在所有研究的性能中,含Mm的合金与含Cc的合金相比,含Y的合金更相似。与含Y的合金相比,含Cc和Mm的合金的玻璃化转变不太明显。对于前两种合金,第一和第二结晶阶段强烈重叠,从而生成完全结晶的合金。而对于Y合金,第一阶段和第二阶段均得到了很好的分解,并且初次结晶产生了嵌入残留非晶基体中的纳米级α-Al颗粒。 (C)2004 Elsevier B.V.保留所有权利。

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