C11b/C40 Lamellar Structure in a Ta-added Molybdenum Disilicide


C11b/C40 fully lamellar microstructures, similar to the well-known TiAl/Ti3Al lamellae, were obtained in Ta- and Nb-added MoSi2 polycrystalline alloys in a previous work. In the present study, the crystallography of the lamellar structure is investigated in a MoSi2-15mol%TaSi2 pseudo-binary alloy after homogenized at 1400°C for 168h, in order to provide some useful parameters for microstructural control to improve mechanical properties. The orientation relationship between C11b and C40 phases and its three distinct variants were identified. Coherency of the lamellar interface is analyzed in comparison with the TiAl/Ti3Al lamellae. Approach to modify the C11b/C40 lamellar microstructure to increase its coherency is discussed based on the results obtained.

This is a preview of subscription content, access via your institution.


  1. 1.

    I.L. Mirkin, and O.D. Kancheev, Met. Sci. Heat Treat., 1/2, 10(1967).

    Article  Google Scholar 

  2. 2.

    R. Darolia, D.F. Lahrman and R. Rield, Scr. metall. mater., 26, 1007(1992).

    CAS  Article  Google Scholar 

  3. 3.

    S.C. Huang, Metall. Trans., 23A, 375(1992).

    CAS  Article  Google Scholar 

  4. 4.

    F.G. Wei, Y. Kimura and Y. Mishima, JIM Symp. Proc., 1999.

    Google Scholar 

  5. 5.

    T. Nakano, M. Azuma and Y. Umakoshi, Intermetallics, 6, 715(1998).

    CAS  Article  Google Scholar 

Download references


This study was supported by the Proposal-Based New Industry Creative Type Technology R&D Promotion Program from the New Energy and Industrial Technology Development Organization (NEDO) of Japan.

Author information



Corresponding author

Correspondence to Fu-Gao Wei.

Rights and permissions

Reprints and Permissions

About this article

Cite this article

Wei, FG., Kimura, Y. & Mishima, Y. C11b/C40 Lamellar Structure in a Ta-added Molybdenum Disilicide. MRS Online Proceedings Library 646, 383–388 (2000). https://doi.org/10.1557/PROC-646-N5.37.1

Download citation