简介概要

Microstructure and microhardness of Ti3Al matrix composites produced by XDTM synthesis

来源期刊:中国有色金属学报(英文版)2002年第6期

论文作者:魏尊杰 房文斌 王宏伟 曾松岩

文章页码:1138 - 1141

Key words:Ti3Al; Ti3AlC; TiC; microhardness; elastic modulus

Abstract: XDTMmethod was used to prepare titanium aluminide(Ti3Al) matrix composites. The phase constitution and the as-cast microstructure of Ti-25Al alloy with different carbon contents have been investigated using XRD and SEM. Microhardness and elastic modulus of the matrix and reinforcements were tested by mechanical property microprobe. In Ti-25Al-0.5C alloy, blocky Ti3AlC and lath Ti3AlC were in-situ formed as reinforcement, and homogeneously distributed in the matrix. The microhardness and elastic modulus of blocky Ti3AlC are 14.2GPa and 281.3GPa respectively, higher than those of the lath Ti3AlC about 3GPa and 60GPa respectively. When C content is more than 0.5%, dendritic TiC and Ti3AlC were formed as reinforcement in a core structure, where the TiC core is coated with Ti3AlC phase. The microhardness and elastic modulus of the reinforcement decrease with increasing distance from the center of the reinforcement and matrix. The maximum microhardness and modulus of TiC and Ti3AlC are 22.8GPa, 302.7GPa and 20.2GPa, 313.5GPa, respectively.

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