Early stages of precipitate rafting in a single crystal Ni-Al-Mo model alloy investigated by small-angle X-ray scattering and TEM
- Univ. Wien (Austria). Inst. fuer Festkoerperphysik
- Carnegie Mellon Univ., Pittsburgh, PA (United States). Dept. of Materials Science and Engineering
A combination of small angle X-ray scattering (SAXS) and transmission electron microscopy (TEM) has been used to investigate experimentally the early stages of directional coarsening (rafting) of the {gamma}{prime} precipitates in a single crystal Ni-Al-Mo model alloy under uniaxial tension along [001]. The precipitates were found to form plate-like rafts perpendicular to the direction of the applied load. Based on microscopic observations, quantitative models for evaluation of the SAXS data were developed, permitting extraction of important structural information from the two-dimensional SAXS spectra on the aspect ratio of the rafts and the waviness of their interfaces. Statistical information on the temporal evolution of the precipitate morphology during the first few hours under load has been obtained. These results are discussed with respect to conflicting theoretical models for the rafting phenomenon.
- Sponsoring Organization:
- National Science Foundation, Washington, DC (United States); Deutsche Forschungsgemeinschaft, Bonn (Germany)
- OSTI ID:
- 483623
- Journal Information:
- Acta Materialia, Vol. 45, Issue 3; Other Information: PBD: Mar 1997
- Country of Publication:
- United States
- Language:
- English
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