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用径迹显微照相技术(PTA)和TEM研究了含0.065wt％B的Ni_3Al合金中的硼分布对其晶界的影响。研究表明,当该合金于700、850、1000℃保温并空冷时,存在硼的晶界偏聚,且偏聚量随着保温温度的升高而减少,保温温度为1000℃时,偏聚量很少;保温温度为700℃或850℃时,偏聚量较大。硼晶界偏聚对该合金晶界内聚力的提高起着关键作用,硼的偏聚量较大时,合金呈完全穿晶断裂;硼的偏聚量较少时,合金呈完全沿晶断裂。
The effects of boron distribution on the grain boundaries of Ni_3Al alloy containing 0.065 wt% B were studied by means of track microscopy (PTA) and TEM. The results show that when the alloy is heat-treated at 700, 850 and 1000 ℃ and air-cooled, there is segregation of boron in the grain boundaries, and the segregation decreases with increasing the holding temperature. When the holding temperature is 1000 ℃, Few; when the holding temperature is 700 ℃ or 850 ℃, the segregation is larger. Boron grain boundary segregation plays a key role in improving the cohesion of the alloy grain boundaries. When the segregation amount of boron is large, the alloy is completely transgranular fracture; when boron segregation is small, the alloy is completely intergranular fracture.