| Ni-30Al-1Hf 合金的微观结构及相变特点 |
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| 引用本文： | 邢占平,韩雅芳,颜鸣皋.Ni-30Al-1Hf 合金的微观结构及相变特点[J].航空学报,1999,20(1):30-33. |
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| 作者姓名： | 邢占平 韩雅芳 颜鸣皋 |
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| 作者单位： | 北京航空材料研究院第１研究室 |
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| 摘 要： | 通过定向凝固技术制备的Ni-30Al-1Hf合金，是一种由γ相增强的树枝状β-NiAl基双相合金。在铸态时β和γ相存在着确定的取向关系。经不同冷却方式的热处理后发现，合金组织结构发生不同程度的变化，其中空冷或油淬后Ni-30Al-1Hf的枝晶干区大部分转变成了NiAl马氏体相。在900℃经拉伸变形后，NiAl马氏体组织已完全消失，而在β-NiAl相内部重新析出块状或条状的γ相。
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| 关 键 词： | NiAl 双相合金 微观结构 相变 |
MICROSTRUCTURE AND PHASE TRANSFORMATION OF THE Ni 30Al 1Hf ALLOY |
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| Xing Zhanping,Han Yafang,Yan Minggao.MICROSTRUCTURE AND PHASE TRANSFORMATION OF THE Ni 30Al 1Hf ALLOY[J].Acta Aeronautica et Astronautica Sinica,1999,20(1):30-33. |
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| Authors: | Xing Zhanping Han Yafang Yan Minggao |
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| Institution: | First Laboratory, Institute of Aeronautical Materials, Beijing, 100095 |
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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. |
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| Keywords: | NiAl two phase alloys microstructure phase transformations |
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