Abstract
The structural evolution of a Ni-rich NiTiPt alloy (Ni50Ti42.5Pt7.5) is studied here as a function of homogenisation temperature. The biphasic microstructure of the as-cast Ni50Ti42.5Pt7.5 alloy consisted of a high-Pt lath type structure that was dispersed in a martensitic NiTiPt matrix. Homogenisation of the as-cast structure at intermediate temperatures (825-925 °C) resulted in the redistribution of the dendritic second phase into a faceted structure. The hardness of the alloy decreased with increasing temperatures within this intermediate homogenisation temperature range due to breaking of the as-cast structure. Homogenisation of the alloys at higher temperatures e.g. 1100 and 1200 °C, resulted in the reformation of a lathed structure with an associated precipitation hardening due to the due to the formation of fine Ni-rich precipitates.
Original language | English |
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Pages (from-to) | 287-290 |
Number of pages | 4 |
Journal | Nuclear Inst. and Methods in Physics Research, B |
Volume | 268 |
Issue number | 3-4 |
DOIs | |
Publication status | Published - Feb 2010 |
Keywords
- DTA
- Hardness
- Microstructure
- Nitinol
- NiTiPt
- XRD