Fe加入NiAl金属间化合物中对塑性及热轧性能的影响

EFFECTS OF IRON ADDED TO NiAl INTERMETALLIC COMPOUND ON THE DUCTILITY AND HOT-ROLLING PROPERTY

  • 摘要: 研究了Fe加入NiAl金属间化合物中对其塑性及热轧性能的影响。结果表明:NiAl合金中Fe含量增至18.4at%,出现(β+γ)双相组织,其室温塑性显著提高,压缩极限应变量可达36.3%。首次发现具有(β+γ)双相组织的1号合金在压缩变形过程中出现三阶段屈服现象。沿晶界分布的γ相的协调变形及β基体的动态再结晶使双相的1号合金获得良好的高温热轧性能,高温轧制总变形量可达88.9%。

     

    Abstract: The effects of iron added to NiAl intermetallic compound on the ductility and hot-rolling property are studied by means of optical and SEM metallographic examina, compression test and hot-rolling experiment. It is found that a (β+γ) dual-phase microstructure is observed, the ductility of the compound is increased remarkably and a compressive plastic strain of 36.3% is obtained, when the amount of iron is increased to18. 4 %at. During compression deformation the No. 1 alloy with (β+γ) dual-phase structure shows three stage yielding phenomenon. The coorperative deformation of the γ-phase dispersed at the grain boundaries of the β-phase and the dynamic recrystallization of the β-matrix result in a good hot-rolling property for the No. 1 alloy, and the amount of hot-rolling deformation can be as high as 88.9%.

     

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