Phase equilibria,diffusion growth and diffusivities in Ni-Al-Pt system using Pt/β-NiAl diffusion couples

<正>The phase equilibria,diffusion growth and diffusivities in the Ni-Al-Pt system at 1 150,1 200 and 1 250℃were studied using Pt/β-NiAl diffusion couples.Based on the measured concentration profiles coupled with the local equilibrium hypothesis,the tie-lines between neighboring phases...

Full description

Saved in:
Bibliographic Details
Published in:Progress in natural science 2011-06, Vol.21 (3), p.221-226
Main Authors: GONG, Wei-yan, ZHANG, Li-jun, WEI, Hai-xia, ZHOU, Chun-gen
Format: Article
Language:English
Subjects:
aluminides
diffusion
equilibria
group
nickel
nickel aluminides
phase
phase equilibria
platinum
platinum group
thermodynamic
Citations: Items that this one cites
Items that cite this one
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:<正>The phase equilibria,diffusion growth and diffusivities in the Ni-Al-Pt system at 1 150,1 200 and 1 250℃were studied using Pt/β-NiAl diffusion couples.Based on the measured concentration profiles coupled with the local equilibrium hypothesis,the tie-lines between neighboring phases were determined.Two intermediate phases,Pt3Al andα-NiPt（Al）,are found to develop between the Pt andβ-NiAl couples.The thicknesses of Pt3Al andα-NiPt（Al） layers varies linearly with the square of annealing time, indicating that the growth of Pt3Al andα-NiPt（Al） are diffusion-controlled.The calculated Arrhenius equations of the parabolic growth constants,k,for the Pt3Al andα-NiPt（Al） phases are obtained,respectively.The average ternary inter-diffusivities of the Pt3Al andβ-NiAl phases at different temperatures are determined from an integration of inter-diffusion fluxes calculated directly from the experimental concentration profiles.
ISSN:1002-0071
DOI:10.1016/S1002-0071(12)60034-3