Abstract
In earlier research a better understanding of the solidifi cation characteristics for a number of platinumbased alloys was established (1). The fi ndings demonstrated a strong tendency toward the formation of shrinkage and gas porosity upon solidifi cation, and HIP, a high-pressure thermal treatment developed as a densifi cation process, was proven to be an effective method to minimise or eliminate this porosity. While the previous results made it clear that porosity had been signifi cantly reduced following the HIP process, the authors had not yet explored the full range of HIP’s effects in terms of post-processed microstructure and mechanical properties. The goal of this new phase of research is to further our understanding by characterising the post-HIP effects on platinum based castings with respect to grain size and shape, chemical distribution and mechanical strength.
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