Intermetallic Compounds

  • Ö. N. Dog˘an, X. Song, D. Palacio, M. C. Gao (2014). Coherent precipitation in a high-temperature Cr–Ni–Al–Ti AlloyJ Mater. Sci., 49, 805-810.


Developing more efficient fossil energy conversion technologies with less environmental impact require high-performance structural materials of long-term reliability that can be used in aggressive environments. Next generation gas turbines combusting hydrogen-rich fuels and oxy-fuels are predicted to have inlet temperatures higher than the current gas turbines. The current gas turbines utilize state-of-the-art nickel-based superalloys in the hottest sections. These materials possess excellent creep strength because they contain high volume fraction of γ’ precipitates coherent with the γ matrix and excellent high-temperature oxidation resistance due to ability to form protective oxide scales on the surface. However, these alloys perform at their temperature capability limit, and there is not much room left for improvement since the application temperatures are already very near their melting points. Chromium alloys present a potential for development of new high-temperature materials. Precipitation characteristics of a Cr–5Ni–5Al–0.5Ti (at.%) alloy were investigated utilizing a series of heat treatments. XRD, SEM, and analytical TEM were used to characterize the microstructure. This study has shown that the small spherical B2-NiAl precipitates forming below 1345 °C are highly coherent and have a well-defined orientation relationship with the Cr-matrix. Also, some evidence has been presented for the formation of L21-Ni2AlTi phase within the B2-NiAl phase.

  • Ö. N. Doğan, S. Chen, X. Song, J. Sears (2011). Structurally modulated precipitates in a refractory Cr–V alloyJournal of Alloys and Compounds, 509(23), 6556-6560.

  • Ö. N. Doğan, X. Song, S. Chen, M. C. Gao (2013). Microstructural study of high-temperature Cr–Ni–Al–Ti alloys supported by first-principles calculationsIntermetallics, 35, 33-40.

  • X. Song, Y. Chen, C. Sequeira, Y. Lei, Q. Wang, Z. Zhang (2003). Microstructure evolution of bcc structure related Ti-Zr-Ni phases in non-stoichiometric Zr-based Zr-Ti-Mn-V-Ni hydride electrode alloysJournal of Materials Research, 18, 37-44.

  • X. Song, Z. Zhang, X. Zhang, Y. Lei, and Q. Wang (1999). Effect of Ti substitution on the microstructure and electrochemical properties of Zr-Mn-V-Ni system alloys, J . Materials Research, 14, 1279-1285.

  • Y. Chen, C. Sequeira, X. Song, C. Chen (2006).  Effect of amorphous transformation on the electrochemical capacity of Rare-earth Mg-based AlloysZ. Phys. Chem, 220, 631-639.

  • Y. Chen, C. Sequeira, X. Song, R. Neto, Q. Wang (2002). Polytypism of La-Ni phases in multicomponent AB5 type hydride electrode alloysInternational Journal of Hydrogen Energy, 27 (1), 63-68.

  • X. Song, Y. Chen, Z. Zhang, Y.Q. Lei, X.B. Zhang, Q.D. Wang (2000). Microstructure and electrochemical properties of Ti-containing AB2 type hydrogen storage electrode alloyInternational Journal of Hydrogen Energy, 25, 649-656.

  • X. Song, X. Zhang, Y. Lei, Z. Zhang, Q. Wang (1999). Effect of microstructure on the electrochemical properties of Zr-Mn-V-Ni system AB2 type hydride electrode alloysInternational Journal of Hydrogen Energy, 24, 455 - 459.

  • Lu G., Chen L., Hu X., Gu J., Shu K., Song X., Lei Y., Wang Q. (1999). Acta. Metall. Sinica (in Chinese), 35, 453.

  • X. Zhang, X. Yang, X. Song, Y. Lei, Q. Wang, Z. Zhang (1999). TEM investigation of ZrO2 in Zr(Ni0.55VxMn0.45-x)2 Hydrogen Storage AlloysJournal of Alloys and Compounds, 293, 101-106.

  • G. Lu, K. Shu, L. Chen, X. Song, X. Yang, Y. Lei, Q. Wang (1999). Structure study on rapidly solidified hydrogen storage alloy Zr(NiM)2.1Journal of Alloys and Compounds, 293, 107.

  • X. Song, X. Zhang, Y. Lei, Z. Zhang and Q. Wang (1998), Correlation between the microstructure and electrochemical properties of Zr-based AB2 type hydride electrode alloysActa Metallurgica Sinica (in Chinese), 34, 977.

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