Paper Title:
Platinum Diffusion and Microstructure Change in a Single Crystal Superalloy and Nickel-Based Model Alloys at 1000°C
  Abstract

Single crystal superalloy TMS82+ and model alloys of Ni-12Al and Ni-6Cr-8Co-12Al were electroplated with 5-6μm of platinum and heat treated at 1000°C for up to 100hrs. In the model alloys the platinum concentration gradient in the interdiffusion region caused uphill diffusion of aluminium. The subsequent surface enrichment led to formation of aluminium-rich γ′ phase. In TMS82+ superalloy inward diffusion of platinum resulted in loss of the γ/γ′ microstructure and formation of new γ and γ′ grains. The initial dissolution of the γ′ cubes was due to the outward diffusion of aluminium. Again, the presence of a platinum gradient in the interdiffusion region resulted in uphill diffusion of aluminium and a net increase in aluminium content at the alloy surface, leading to a near-surface single-phase γ′ layer being formed, however topologically close-packed (TCP) phase formation was not observed.

  Info
Periodical
Materials Science Forum (Volumes 595-598)
Edited by
Pierre Steinmetz, Ian G. Wright, Alain Galerie, Daniel Monceau and Stéphane Mathieu
Pages
69-76
DOI
10.4028/www.scientific.net/MSF.595-598.69
Citation
S. Ford, S. Hayashi, T. Narita, "Platinum Diffusion and Microstructure Change in a Single Crystal Superalloy and Nickel-Based Model Alloys at 1000°C", Materials Science Forum, Vols. 595-598, pp. 69-76, 2008
Online since
September 2008
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$32.00
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