X-Ray Diffraction Study of Martensitic Phase Transition in In-23at.%Tl Alloy.

N.Toyoshima1, K.Harada1, H.Abe1, K.Ohshima1, T.Suzuki1, M.Wuttig2 and T.R.Finlayson3

1Institute of Applied Physics, University of Tsukuba, Tsukuba 305, Japan
2Department of Materials and Nuclear Engineering, University of Maryland, College Park, MD 20742-2115, U. S. A.
3Department Physics, Monash University, Clayton, Victoria 3168, Australia

J.Phys.Soc.Jpn., Vol.63, pp1808-1813(1994). 

With the use of the X-ray diffraction technique, we have observed temperature-independent extra diffuse scattering (EDS) close to Bragg reflections in the face centered cubic (fcc) phase of an In-23at.% Tl alloy in addition to ordinary thermal diffuse scattering (TDS). The EDS is understood to originated from the intrinsic deformations in the specimen. No diffuse scattering due to precursor phenomena was detected in the diffraction pattern. An incubation time of more than several hours which the crystal temperature was maintained at 256+-0.02K, its martensite start temperature Ms, was required to transform from the fcc structure to face centered tetragonal (fct) structure. The fcc structure was completely recovered from the fct structure on warming the crystal from a temperature below Ms back to room temperature.

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