A photographic record of the soldification and melting of 4He at pressures between 4 and 7 kbar

J.P. Franck

Physica A: Statistical Mechanics and its Applications, 1981, vol. 106, issue 1, 215-225

Abstract: The solidification and melting at constant volume of 4He was visually observed at pressures between 4 and 7 kbar. The isochoric melting interval is about 5 K wide, and the pressure change is about 1 kbar. At small cooling rates well-defined facets develop between solid and liquid and between grains. At large cooling rates the crystal growth begins with the sudden appearance of needles. Intergrain boundaries tend to become less pronounced as cooling proceeds. Towards the end of the solidification process a rather wide interface between solid and liquid appears, which becomes the source of highly faulted regions. Some of these regions remain in the completely formed solid. The melting process always starts at these faulted regions, which increase dramatically during the melting interval. Photographs of these processes were taken with a resolution of approximately 5 μm.

Date: 1981
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Persistent link: https://EconPapers.repec.org/RePEc:eee:phsmap:v:106:y:1981:i:1:p:215-225

DOI: 10.1016/0378-4371(81)90221-1

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