| タイトル | Particle Engulfment and Pushing by Solidification Interfaces |
| 著者（英） | Juretzko, Frank R.; Stefanescu, Doru M.; Dhindaw, Brij K.; Sen, subhayu; Curreri, Peter A. |
| 著者所属（英） | NASA Marshall Space Flight Center |
| 発行日 | 1998-01-01 |
| 言語 | eng |
| 内容記述 | Directional solidification experiments have been carried out to determine the pushing/engulfment transition for two different metal/particle systems. The systems chosen were aluminum/zirconia particles and zinc/zirconia particles. Pure metals (99.999% Al and 99.95% Zn) and spherical particles (500 microns in diameter) were used. The particles were non-reactive with the matrices within the temperature range of interest. The experiments were conducted such as to insure a planar solid/liquid interface during solidification. Particle location before and after processing was evaluated by X-ray transmission microscopy for the Al/ZrO2 samples. All samples were characterized by optical metallography after processing. A clear methodology for the experiment evaluation was developed to unambiguously interpret the occurrence of the pushing/engulfment transition. It was found that the critical velocity for engulfment ranges from 1.9 to 2.4 micron/s for Al/ZrO2 and from 1.9 to 2.9 microns/s for Zn/ZrO2. |
| NASA分類 | Solid-State Physics |
| 権利 | No Copyright |
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