کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
1446183 988601 2013 15 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Crystallography of surface precipitates associated with shape change in a Ti–5.26 wt.% Cr alloy
موضوعات مرتبط
مهندسی و علوم پایه مهندسی مواد سرامیک و کامپوزیت
پیش نمایش صفحه اول مقاله
Crystallography of surface precipitates associated with shape change in a Ti–5.26 wt.% Cr alloy
چکیده انگلیسی

The crystallographic features of surface α precipitates accompanied by surface tilt(s) in a Ti–5.26 wt.% Cr alloy have been comprehensively studied by transmission electron microscopy of samples prepared using a focused ion beam. For comparison, the bulk precipitates formed far below the free surface in the same alloy have also been examined. It is found that both the surface and the bulk α precipitates exhibit a lath-shaped morphology and their habit plane always contains a single set of misfit dislocations with the Burgers vector [11¯1]β/2|[21¯1¯3]α/6. However, the surface precipitates differ from the bulk ones in terms of their orientation relationship with the matrix, the habit plane and the long axis direction. As a result, the interphase interface between the surface precipitates and matrix contains glissile dislocations and the interface of bulk precipitates is associated with sessile dislocations. Such a glissile interface is one of the major common features of displacive-diffusional and martensitic transformations and can be used to further understand the mechanism of bainitic transformation in steels and other alloy systems.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Acta Materialia - Volume 61, Issue 20, December 2013, Pages 7624–7638
نویسندگان
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