کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
7881574 1509600 2014 8 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
〈c + a〉 Dislocations in deformed Ti-6Al-4V micro-cantilevers
موضوعات مرتبط
مهندسی و علوم پایه مهندسی مواد سرامیک و کامپوزیت
پیش نمایش صفحه اول مقاله
〈c + a〉 Dislocations in deformed Ti-6Al-4V micro-cantilevers
چکیده انگلیسی
Single α-β colony micro-cantilevers with an equilateral triangular cross-section and an apex at the bottom were machined from a polycrystalline commercial Ti-6Al-4V sample using a focused ion beam (FIB). Each cantilever contained several α lamellae separated by thin fillets of β. A nano-indenter was used to perform micro-bending tests (Ding et al., 2012) [1]. 〈c + a〉 Slip systems were selectively activated in the cantilevers by controlling the crystal direction along the micro-cantilever to be [0 0 0 1]. Specimens for transmission electron microscopy were prepared from the deformed micro-cantilevers using a dual-beam FIB. Bright field scanning transmission electron microscopy was used to investigate the processes of slip nucleation, propagation and transmission through the α/β interface. Dislocations initiate first near the bottom of the cantilever and subsequently from the top. Both sets of dislocations move inward toward the neutral axis. Planar pyramidal {101¯1} slip was observed at the top (tension) but cross-slip was observed at the bottom (compression). All the 〈c + a〉 slip systems are equally stressed, but only a limited number is activated. This is tentatively interpreted in terms of dislocation transmission through the β fillets.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Acta Materialia - Volume 76, 1 September 2014, Pages 127-134
نویسندگان
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