Abstract
The aim of this study is to understand the effects of boron addition on the mechanical properties of the Ir 85Hf 15 two-phase refractory superalloy, especially on the fracture behaviour and the high-temperature strength. Our results indicated that adding boron was an effective way to raise the strength of Ir 85Hf 15 alloy at both room and high temperatures when the boron content was below a limited value, which was approximately 200 wppm for Ir 85Hf 15 alloy. Meanwhile, adding boron did not significantly improve the ductility, but it changed the fracture mode from the morphology of grain-boundary fractures generally observed in polycrystalline Ir and binary Ir 85Hf 15 alloys to mainly transgranular cleavage seen in the boron-doped Ir 85Hf 15. The effects of boron addition are discussed in terms of microstructure change and phase constitution.
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