弥散强化相对PtIr5合金高温蠕变性能的影响

Effect of Dispersion-Strengthened Phase on High Temperature Creep Property of PtIr5 Alloy

摘要:

研究了Pt-5Ir和ZGSPt-5Ir高温材料在1423～1523 K温度范围内的蠕变行为。结果表明：由于氧化锆颗粒的添加，弥散强化PtIr5材料的高温蠕变性能比Pt-5Ir的性能优异。弥散强化PtIr5的蠕变机制为晶格自扩散引起的高温攀移控制，断裂方式为沿晶脆性断裂；Pt-5Ir的蠕变机制为牛顿粘滞滑移控制，断裂方式为穿晶韧性断裂。

Abstract:

The creep behavior of Pt-5Ir and ZGSPt-5Ir high-temperature materials in the temperature range of 1423-1523 K were investigated. The results show that the creep property of ZGSPt-5Ir is better than that of Pt-5Ir because of ZrO2 addition. The creep characteristic of ZGSPt-5Ir is consistent with a structure-controlled creep process where some form of dislocation climb caused by lattice self-diffusion controls the creep deformation. And the fracture mode is brittle intergranular fracture. The creep characteristic of Pt-5Ir is consistent with mobility-controlled deformation where viscous glide of dislocations controls the creep. And the fracture mode of that is transgranular ductile fracture.