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...
Saved in:
Published in | Progress in natural science Vol. 21; no. 3; pp. 221 - 226 |
---|---|
Main Authors | , , , |
Format | Journal Article |
Language | English |
Published |
Elsevier Ltd
01.06.2011
|
Subjects | |
Online Access | Get full text |
Cover
Loading…
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. |
---|---|
Bibliography: | Wei-yan GONG~1,Li-jun ZHANG~2,Hai-xia WEI~1,Chun-gen ZHOU~1 1.Key Laboratory of Aerospace Materials and Performance,Ministry of Education, School of Materials Science and Engineering,Beihang University,Beijing 100191,China; 2.Interdisciplinary Centre for Advanced Materials Simulation,Ruhr-Universitat Bochum, 44801 Bochum,Germany 11-3853/N |
ISSN: | 1002-0071 |
DOI: | 10.1016/S1002-0071(12)60034-3 |