MICROSTRUCTURE OF RAPIDLY SOLIDIFIED TiAl ALLOY POWDER

Abstract

Abstract: The rapidly solidified powder of Ti-34Al-2Mn alloy was obtained by means of ultrasonic gas atomisation (USGA) technique.The tupical size of the powder is 27 μm.X-ray diffraction results show that the powder consists of major α_2-phase and minor γ-phase.Under optical microscope both equiaxed and dendritical microstructure features were observed on RS pow- der sections.After annealing at 900 ℃/for 2 h in vacuum,most of α_2-phase transforms into γ-phase,resulting in refinement of structure.

Key words: repid solidification, TiAl intermetallic compound, microstructure

CAO Mingzhou HAN Dong ZHANG Tao LI Dong Institute of Metal Research,Academia Sinica,Shenyang,China Associate Professor,Institute of Metal Research,Academia Sinica,Shenyang 110015,China. MICROSTRUCTURE OF RAPIDLY SOLIDIFIED TiAl ALLOY POWDER[J]. Acta Metallurgica Sinica (English Letters), 1993, 6(2): 117-120.

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MICROSTRUCTURE OF RAPIDLY SOLIDIFIED TiAl ALLOY POWDER

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