کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
1573344 1514674 2016 7 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Nanocrystallization mechanism of beta phase in Ti-6Al-4V subjected to severe plastic deformation
موضوعات مرتبط
مهندسی و علوم پایه مهندسی مواد دانش مواد (عمومی)
پیش نمایش صفحه اول مقاله
Nanocrystallization mechanism of beta phase in Ti-6Al-4V subjected to severe plastic deformation
چکیده انگلیسی
Nanocrystallization mechanism of beta phase in the bulk coarse-grained Ti-6Al-4V by high energy shot peening was investigated via high-resolution transmission electron microscopy. The results suggested that dislocation gliding was first initiated in beta phase at and around the intersections of the phase boundary with the high-density dislocation structures in alpha phase followed by the formation of dislocation tangles and dislocation walls. As the short axis sizes of alpha phase approached that of beta phase, the dislocation tangles and dislocation walls gradually evolved into the high-angle grain boundaries and subdivided the original grains into the equiaxed ultrafine grains. Under the ultrahigh strain and strain rate, the equiaxed ultrafine grains were eventually refined to randomly oriented nanograins via dynamic recrystallization. In addition, the nanograins would be further refined via dislocation motion upon further straining.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Materials Science and Engineering: A - Volume 669, 4 July 2016, Pages 7-13
نویسندگان
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