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巳知微量硼加入到Ni_3Al中由于增加了晶界结合能,可以增加这种合金的延性,加入铪可以增加屈服强度,提高使用温度。另外,从超级耐热合金的经验可知定向凝固法可提高耐热性能。所以,可以预计加入微量B、Hf,用定向凝固法制得的Ni_3Al一定具有优良的高温机械性能。为此,使用了三种成分的Ni_3Al合金作试验。它们的成分(%)为1)Al ll.78,Hf 3.39、B 0.02、Ni余量,2) Al ll.37、Hf5.00,B0.02,Ni余量,3)Al ll.7、Hf3.5、B0.5,Ni余量。在拉拔速度为0～50cm/h的范围内制成定向凝固Ni_3Al。
It has been known that a trace amount of boron added to Ni_3Al due to increased grain boundary binding energy, can increase the ductility of this alloy, adding hafnium can increase the yield strength and increase the use of temperature. In addition, the super heat-resistant alloy experience shows that directional solidification method can improve the heat resistance. Therefore, it can be expected to add a trace amount of B, Hf, Ni_3Al prepared by directional solidification method must have excellent high temperature mechanical properties. To this end, the use of three components Ni_3Al alloy for testing. Their composition (%) is 1) Al ll.78, Hf 3.39, B 0.02, Ni balance, 2) Al ll.37, Hf5.00, B0.02, Ni balance, 3) Al ll.7, Hf3.5, B0.5, Ni balance. Directional solidification of Ni 3 Al was made at a drawing speed of 0-50 cm / h.