钇和硅对Ni_3Al基IC6合金组织和性能的影响

EFFECT OF YTTRIUM AND SILICON ON MICROSTRUCTURE AND PROPERTIES OF Ni_3Al BASE ALLOY IC6

利用电子探针研究了不同含量Y和Si对定向凝固Ni3Al基合金IC6微观组织的影响，测定了合金的1100℃抗氧化性能、1100℃／80MPa持久性能、1100℃热疲劳性能以及各种温度下的瞬时性能，结果表明，加适量Y有利于提高IC6合金的高温抗氧化性能、持久性能和热疲劳性能，Si也有利于提高IC6合金的高温抗氧化性能，而对持久性能和热疲劳性能不利。

The effect of different amounts of yttrium and silicon on the microstructure of directionally solidified Ni3Al base alloy IC6 was studied with electron probe microstructural analysis(EPMA). The oxidation resistance at 1100℃, stress rupture property under 1100℃ /80MPa, thermal fatigue property at 1100℃ and tensile properties at different temperatures were tested, the results show that the high temperature oxidation resistance, stress rupture property and thermal fatigue property of alloy IC6 are increased by adding proper amounts of yttrium. Silicon is beneficial to the high temperature oxidation resistance but harmful to the stress rupture property and thermal fatigue property. The addition of yttrium and silicon has no obvious influence on the tensile properties.