Abstract
The thermoequilibrium state of short range order (SRO) and the ordering process to the long range order (LRO) phase in Cu3Pt have been studied by thein situ transmission electron microscope (TEM) observation method. It is confirmed that the alloy has the SRO state in thermoequilibrium within the temperature region for the disordered fcc phase (designated as A1). The SRO state can be interpreted in the ‘microdomain model’. The degree of order fluctuates temporally as well as spatially at higher temperature, but freezes at a lower temperature in the A1 region. In the temperature region of (A1+LRO), some of the microdomains in the SRO grow up to large domains of LRO. This indicates that the transformation process to LRO via SRO proceeds without a process of nucleation even though the transformation is of a first order. Division of A1 into subregions and physical meaning of the phase boundary between (A1+LRO) and A1 are discussed.
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