SYNTHESIS OF TiAl+TiB_2 COMPOSITE AND-ITS THERMAL STABILITY

Abstract

Abstract: Synthesis process of a TiAl+TiB_2 composite from the elemental powders was studied by means of differential scanning calorimetry and X-ray diffractometry.TiB_2 particles may form in TiAl matrix at temperature even below 700℃ owing to the exothermic reactions between Ti and Al powders.TiB_2 particles are very thermally stable,and they almost did not change in their relative amount,morphology and size after the synthesized composite was remelted.In addition,the existence of TiB_2 particles has obvious refining effect in the as-cast microstructure of TiAl-base alloys.

Key words: TiAl alloy, TiB_2, composite, thermal stability

QU Xuanhui HUANC Baiyun LEI Changming CHEN Shiqi Central South University of Technology,Changsha,China professor,Powder Metallurgy Research Institute,Central South University of Technology,Changsha 410083,China. SYNTHESIS OF TiAl+TiB_2 COMPOSITE AND-ITS THERMAL STABILITY[J]. Acta Metallurgica Sinica (English Letters), 1993, 6(12): 427-431.

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SYNTHESIS OF TiAl+TiB_2 COMPOSITE AND-ITS THERMAL STABILITY

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