Comparative Study of Oswald Ripening and Trans-Interface Diffusion-Controlled Theory Models: Coarsening of γ ' Precipitates Affected by Elastic Strain Along a Concentration Gradient

C. G. Garay-Reyes; S. E. Hernández-Martínez; J. L. Hernández-Rivera; J. J. Cruz-Rivera; E. J. Gutiérrez-Castañeda; H. J. Dorantes-Rosales; J. Aguilar-Santillan; R. Martínez-Sánchez

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자료유형: 학술저널

저자정보: C. G. Garay-Reyes (Laboratorio Nacional de Nanotecnología) S. E. Hernández-Martínez (Universidad Autónoma de San Luis Potosí) J. L. Hernández-Rivera (Universidad Autónoma de San Luis Potosí) J. J. Cruz-Rivera (Universidad Autónoma de San Luis Potosí) E. J. Gutiérrez-Castañeda (Universidad Autónoma de San Luis Potosí) H. J. Dorantes-Rosales (ESIQIE-DIM) J. Aguilar-Santillan (Materials and Tools LLC) R. Martínez-Sánchez (Laboratorio Nacional de Nanotecnología)

저널정보: 대한금속·재료학회 Metals and Materials International Metals and Materials International Vol.23 No.2

발행연도: 2017.1

수록면: 298 - 307 (10page)

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According to Lifshitz, Slyozov, and Wagner (LSW) and Trans-Interface Diffusion-Controlled (TICD) theoreticalmodels, this paper reports the microstructure and its coarsening behavior of γ' metastable-coherentprecipitates in concentration gradient of Ni-13.75Ti (at%)/Ni generated by diffusion couple. The coarseningof precipitates was evaluated in two different Ti contents (R1-11.4Ti (at%) and R2-13Ti (at%)) generated alongthe concentration gradient and includes average size, size distributions and growth rate. The solvus andmetastable-coherent bimodal lines as determined at 850 °C of 9.16 (at%) and 9.92Ti (at%) respectively byscanning electron microscopy. This paper suggests that elastic strains produced by the matrix/precipitate latticemismatch caused significant deviations between the experimental results and those predicted by the LSW or TIDCtheories. Activation energies for TIDC (Qi) and LSW (Qr) are Qr: 219.69 and 172.61 kJ mol-1for R1 and R2regions, respectively, and Qi: 218.46 and 164.56 kJmol-1for R1 and R2 regions, respectively. A concentration gradientallows the study of various alloys with different concentration and volume-fraction in a single sample.

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참고문헌 신청

T. M. Pollock / 2006 / J. Propul. Power 22:361

S. Zhao / 2004 / Mater. Lett 58:1784

L. Hongyu / 2009 / Rare Metals 28:197

R. C. Reed / 2008 / The Superalloys Fundamentals and Applications / Cambridge University Press :33~114

A. Baldan / 2002 / J. Mater. Sci 37:2171

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