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采用籽晶法制备了二代镍基单晶高温合金DD5小角度晶界试样,研究小角度晶界对DD5合金力学性能的影响.结果表明:在870 ℃中温拉伸中,晶界角度小于16.1°时,合金抗拉强度和屈服强度无明显变化;晶界角度小于11.4°时,伸长率维持在15%以上;晶界角度大于11.4°后,伸长率开始快速下降;在980 ℃/250 MPa 持久条件下,当晶界角度小于5.1°时,持久寿命维持在140 h以上;当晶界角度大于5.1°时,持久寿命随晶界角度增大开始缓慢下降,至14.8°时,持久寿命仍保持为原来的85%;当晶界角度大于14.8°后持久寿命开始快速下降;在1093 ℃/158 MPa持久条件下,当晶界角度小于5.1°时,持久寿命维持在30 h以上;当晶界角度大于5.1°时,持久寿命随晶界角度增大而下降.

The effects of low angle grain boundaries on the mechanical properties of second generation single crystal superalloy DD5 were investigated and the test specimens were prepared by using seeds.The results show that at 870 ℃,the yield strength and breaking strength showed no difference when the angle is below 16.1°.The elongation is higher than 15% when the angle is below 11.4°,but the elongation decreases quickly when angle is above 11.4°.At 980 ℃/250 MPa,the rupture life is higher than 130 h when the angle is below 5.1°,and decreased slowly when the angle is above 5.1°.The rupture life still remaines 85% when the angle is 14.8°.But the rupture life decreases quickly when the angle is above 14.8°.At 1093 ℃/158 MPa,the rupture life is higher than 30 h when the angle is below 5.1°,and decreases when the angle is above 5.1°.

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