X. Wu, University of Birmingham, Birmingham, United Kingdom; Q. Li, The University of Birmingham, Birmingham, United Kingdom; R. Morrell, National Physical Laboratory, Teddington, United Kingdom
Hot Isostatic pressing (HIPping) has been used to consolidate atomised Nb-Si alloy, Nb-16Si-25Ti-8Hf-2Cr-2Al using a three stage HIPping process with the aim of producing a near net shape component. The details of the consolidation during HIPping have been assessed using analytical scanning and transmission electron microscopy and X-ray diffraction. The powder is HIPped in mild steel tooling to define the shape after which it is de-canned and HIPped at higher temperatures in order to remove the small amount of remaining porosity. Young’s modulus and the shear moduli of the powder-HIPped samples have been measured and are similar to those found in cast samples. The creep properties are considerably worse than those of cast samples presumably because of the fine scale of the microstructure. These observations are discussed in terms of using HIPping of powder to produce net shape components of NbSi-based alloys.
Summary: Hot Isostatic pressing (HIPping) has been used to consolidate the atomised Nb-Si alloy, Nb-16Si-25Ti-8Hf-2Cr-2Al using a three stage HIPping process with the aim of producing a near net shape component. The elastic moduli and creep properties of fully dense samples have been assessed. The potential of this approach for NbSi-based alloys will be discussed.
