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ACTA AERONAUTICAET ASTRONAUTICA SINICA ›› 1999, Vol. 20 ›› Issue (1): 30-33.
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Xing Zhanping, Han Yafang, Yan Minggao
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Abstract:
NiAl based two phase (β+γ) alloy Ni 30Al 1Hf was prepared by a directionally solidified method. It was found that the microstructure of the alloy was composed of β NiAl dendrites surrounded by interdendritic γ phases, There is an orientation relationship between β and γ phases in the as cast state. Homogenization at 1280℃/6h followed by air cooling or oil quenching resulted in the β NiAl phases in the two alloys mostly transformed to NiAl martensites . In the meantime, the volume percent of the γ Ni3Al phases decreased with increased cooling rate. After tensile testing at 900℃, all of the martensites disappeared, while γ precipitates were formed in the β NiAl phases.
Key words: NiAl, two-phase alloys, micr ostr uctur e, phase transformations
CLC Number:
V252.2
TG111.5
Xing Zhanping;Han Yafang;Yan Minggao. MICROSTRUCTURE AND PHASE TRANSFORMATION OF THE Ni 30Al 1Hf ALLOY[J]. ACTA AERONAUTICAET ASTRONAUTICA SINICA, 1999, 20(1): 30-33.
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