Abstract
Porous TiNi alloys with porosities in the range of 51 to 73 pct were prepared successfully applying a new powder metallurgy fabrication route in which magnesium was used as a space holder, resulting in either single austenite phase or a mixture of austenite and martensite phases dictated by the composition of the starting powders, but entirely free from secondary brittle intermetallics, oxides, nitrides, and carbonitrides. Since transformation temperatures are very sensitive to composition, deformation, and oxidation, for the first time, transformation temperatures of porous TiNi alloys were investigated using chemically homogeneous specimens in as-sintered and aged conditions eliminating secondary phase, contamination, and deformation effects. It was found that the porosity content of the foams has no influence on the phase transformation temperatures both in as-sintered and aged conditions, while deformation, oxidation, and aging treatment are severely influential.
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Acknowledgments
The authors gratefully acknowledge the financial support of this research by the Faculty Development Program (ÖYP) at Middle East Technical University with DPT-BAP (Grant No. BAP-08-11-DPT2002K120510) and The Scientific and Technological Research Council of Turkey (TUBITAK, Project No. 108M118).
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Manuscript submitted October 7, 2010.
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Aydoğmuş, T., Bor, E.T. & Bor, Ş. Phase Transformation Behavior of Porous TiNi Alloys Produced by Powder Metallurgy Using Magnesium as a Space Holder. Metall Mater Trans A 42, 2547–2555 (2011). https://doi.org/10.1007/s11661-011-0714-z
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DOI: https://doi.org/10.1007/s11661-011-0714-z