By S. Velumani and René Asomoza
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Extra info for Advances in Semiconducting Materials
44, 11, 1996, pp. 4317-4326. W. A. Prisbrey, Met. , Vol. 27A, 8, August 1996, pp. 2086-2093.  S. Gialanella et. , Vol. 8, 3, 2000, pp. 279-286.  T. Takasugi, J. Kishino, and S. , Vol. 1021-1031.  A. al, in ASTM Special Publication STP 1365, Cobalt-Base Alloys for Biomedical Applications. Eds. John A. Disegi, Richard L. Kennedy, and Robert Pilliar, USA 1999, pp. 179-190.  L. Backerud, G. Chai, and J. Tamminen, "Solidification Characteristics of Aluminum Alloys, Vol. 2, Foundry Alloys".
3. SEM micrographs showing the time effect on crack healing for Ni/Al2O3 sample healed at 1000ºC in air for (a) 1 h, (b) 12 h, and (c) 24 h. In order to investigate the composition of this new material we used the XRD method. Fig. 4 shows the XRD patterns and the SEM images of several sample surfaces. Fig. 4 (a) shows the results for the as-sintered specimen in which only Ni and α-Al2O3 peaks were detected and no other crystalline phases were observed. Fig. 4 (b) shows the sample annealed at 1300°C for 3 h.
0104 m2/s. Therefore, the value of the activation energy of the synthesis process was 242 KJ/mol, which is also very close to the energy required for diffusion of pure elements through a solid interface . 32 Advances in Semiconducting Materials 4. Conclusions A mixture of two different intermetallic compounds was obtained by pressure-assisted reactive sintering from elemental Al, Fe, Mn, and Si powders, at temperatures on the order of 800 oC, under an applied stress of 20 MPa. 10 wt % Mn. From DTA experiments and kinetic measurements regarding microstructure formation of those quaternary phases by pressure-assisted reactive sintering, it can be concluded that the mechanism first involves the diffusion of Si in Al to produce Al solid solutions until a molten Al-Si phase is obtained.