The results show that the mean value of fracture toughness is approximately 23 6 MPa m 12 and the maximum of fracture toughness reaches 28 MPa m 12 for the CSD sample, while only 15 3 MPa m 12 for the HIP sample.

• 采用三点弯曲试验方法进行测试,结果表明,喷射沉积合金样品的平均断裂韧度值为236MPam12,最大值约28MPam12,而经热等静压后样品的平均断裂韧度仅为153MPam12。