کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
1604977 | 1516204 | 2017 | 9 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Influence of γⲠprecipitates on the critical strain and localized deformation of serrated flow in Ni-based superalloys
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
مهندسی مواد
فلزات و آلیاژها
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چکیده انگلیسی
Although γⲠprecipitates enhance the strength of Ni-based superalloys, they can also promote an undesirable phenomenon called the Portevin-Le Chatelier (PLC) effect. Alloys designed and fabricated with various γⲠcontents were subjected to uniaxial tensile tests at different temperatures (523-923 K) and strain rates (1 Ã 10â4-3 Ã 10â3 sâ1). It was found that the γⲠprecipitates facilitated a transition of the PLC effect from normal to inverse behavior. From the viewpoint of the critical strain, the temperature transition region shifted to low temperatures with increasing γⲠcontent. Digital image correlation was applied to the observations of the localization band in relation to the γⲠcontent at 773 K and 1 Ã 10â4 sâ1. Surface strain mapping indicated that severe localized deformation was accompanied by high-amplitude serrations. Microscopic observations from transmission electron microscopy indicated that the deformation mode switched from dislocation motion to stacking fault (SF) formation with increasing γⲠcontent. With the aid of Suzuki segregation and SF intersections of different slip planes, a large number of SFs might induce high-amplitude serrations, especially those associated with the inverse PLC effect.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Alloys and Compounds - Volume 690, 5 January 2017, Pages 707-715
Journal: Journal of Alloys and Compounds - Volume 690, 5 January 2017, Pages 707-715
نویسندگان
Yulong Cai, Chenggang Tian, Guoliang Zhang, Guoming Han, Suli Yang, Shihua Fu, Chuanyong Cui, Qingchuan Zhang,