期刊
INTERNATIONAL JOURNAL OF REFRACTORY METALS & HARD MATERIALS
卷 45, 期 -, 页码 64-70出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.ijrmhm.2014.03.008
关键词
Explosive loading; Tungsten; Dynamic recrystallization; Grain refinement; Dislocation walls
资金
- National Science Foundation of China [51201013]
The microstructural evolution and grain refinement mechanism of pure tungsten prepared by chemical vapor deposition under explosive loading condition were systematically investigated. Results show that dynamic recrystallization is the main deformation mechanism of pure tungsten under explosive loading condition, and new refined tungsten grains were observed in the deformed tungsten. However, the grain refinement mechanism of tungsten is obviously different from that of subgrain rotational dynamic recrystallization (RDR) mechanism and progressive subgrain misorientation recrystallization (PriSM) mechanism. Under the explosive loading condition, the tungsten grains are severely elongated into fibrous grains. Because the deformation time is ultra-short, dislocation slips are conducted through single slip system within the elongated tungsten grain, resulting in the formation of high density dislocation walls consisting of parallel dislocation lines. With continuous deformation, the high density dislocation walls are transformed into subgrain boundaries, which further evolve into refined boundaries. Then the fibrous tungsten grains are fragmented into equiaxed grains. No deformation twins were observed in the deformed pure tungsten. Crown Copyright (C) 2014 Published by Elsevier Ltd. All rights reserved.
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