کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
1603190 1515975 2014 7 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Microstructural evolution and grain refinement mechanism of pure tungsten under explosive loading condition
ترجمه فارسی عنوان
تکامل میکرو سازمانی و ساز و کار پالایش دانه تنگستن خالص تحت شرایط بارگیری مواد منفجره
کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه مهندسی مواد فلزات و آلیاژها
چکیده انگلیسی


• The deformation mechanism of CVD W during ultra-high strain rate deformation process was revealed.
• Dislocation walls induced grain refinement mechanism of CVD W under ultra-high strain rate condition was revealed.
• The microstructure evolution of CVD W under ultra-high strain rate condition was revealed.

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.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: International Journal of Refractory Metals and Hard Materials - Volume 45, July 2014, Pages 64–70
نویسندگان
, , , , ,