J. Phys. IV France 7 (1997) C2-1239-C2-1240
A XAFS Study on the Site Determination of Additives in the Ni3Al Intermetallic CompoundM. Sakurai1, M. Matsuura2, K. Suzuki1, A. Chiba3 and S. Hanada1
1 Institute for Materials Research, Tohoku University, Sendai 980, Japan
2 Miyagi National College of Technology, Natori Miyagi 981-12, Japan
3 Faculty of Engineering, Department of Metallurgy, Iwate University, Morioka 020, Japan
Occupied sites by dopants of Ag(0.1 at%), Pd(2at%) and Zr(0.4at%) in the Ni3Al intermetaillic compound are investigated by means of EXAFS analysis. It is found that Pd substitutes the Ni site and Zr substitutes the Al site. These results are consistent with tthose of channeling enhanced microanalysis. Ag is also determined to substitute in the Ni site by EXAFS and this result supports that Ag additive is γ-phase(disorder phase) former. The expansion of the nearest neighbor distance around Ag, Pd and Zr are 2%, 3% and 4% respectively.
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