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

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％。

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 incteased remarkably and a compressive Plastic strain of 36.3% is obtained, when the amount of iron is increased to 18. 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 γPhase dispersed at the grain boundaries of fhe β-phase and the dynamic rectystallization 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 88.90%