Conference proceeding
Further Observations on the Kinetics of Precipitate Growth in Aluminum--Silver
Solid to Solid Phase Transformations; Pittsburgh; Pa.; 10-14 Aug. 1981, pp.555-559
10 Aug 1981
Abstract
Recent investigations of precipitate growth kinetics in Al--Ag (12-26% Ag) have shown that while in the earliest stages of precipitation the thickening of the plate-like precipitates is inhibited by interfacial processes, giving an increase in the aspect ratio, subsequent thickening and lengthening occurs at diffusion-controlled rates with a constant aspect ratio. Precipitation was studied under a range of supersaturations and temperatures to study the effects of these variables on the transition to diffusion-controlled growth. For the precipitate sizes studied by scanning electron microscopy (precipitates longer than 5 mu m and thicker than 0.07 mu m), diffusion-controlled growth was again found but with a systematic increase of aspect ratio as the supersaturation was decreased. It is proposed that the period of inhibited thickening, that gives an increase in aspect ratio, ends when the longest precipitate intersect other precipitates, normally on different variants of the {111} habit plane. The intersection point provides the growth ledges that are needed for thickening. The pre cipitates show the increase of aspect ratio with increased interprecipitate spacing required by this model. A light deformation prior to precipitation greatly increased the density of precipitates and reduced the aspect ratio.--AA.
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Details
- Title
- Further Observations on the Kinetics of Precipitate Growth in Aluminum--Silver
- Creators
- K RajabR Doherty
- Publication Details
- Solid to Solid Phase Transformations; Pittsburgh; Pa.; 10-14 Aug. 1981, pp.555-559
- Resource Type
- Conference proceeding
- Language
- English
- Academic Unit
- [Retired Faculty]; Materials Science and Engineering
- Identifiers
- 991021890012204721