Growth of the Recrystallized Grain in Plastically Deformed Ice Single Crystal
| Autor: | Yuichi Igarashi, Kaoru Kitakizaki, Akeharu Fukuda |
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| Rok vydání: | 1977 |
| Předmět: | |
| Zdroj: | Journal of the Japanese Society of Snow and Ice. 39:109-116 |
| ISSN: | 1883-6267 0373-1006 |
| DOI: | 10.5331/seppyo.39.109 |
| Popis: | Recrystallization takes place in the central bent part of ice single crystals plastically deformed by the method of three point bending. This process was observed with timelapse 16 m/m movie camera. The area of the recrystallized grain were measured from enlarged photographs of movie frames taken intermittently from films. At the steady state, the area S increased linearly with time t is expressed, as S=kt+C, where k is the areal speed of the grain growth.Since the grain grew in similar figures with the common vertical angle, the linear velocity of growing front v is derived as v=k/βr, where β is a constant, and r is the modified diameter of the grain (Fig. 8). Inverse proportionality of v to r was explained by the same relationship between the driving force P and r (eq. 11). The driving force consists of the energy of small angle grain boundaries distributed radially in the bent area and of the grain boundary energy.Then the mobility of the grain boundary M was obtained by dividing the velocity by the drivingforce P and its value ranged (3. 19. 5) × 10-10cm3.dyn.-1sec-1. |
| Databáze: | OpenAIRE |
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