کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
5455480 | 1514643 | 2017 | 9 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Degradation and onset of plastic anisotropy in marine aluminum alloy due to fire exposure by bulk neutron diffraction and in situ loading
ترجمه فارسی عنوان
تخریب و شروع ناپایداری پلاستیکی در آلیاژ آلیاژی دریایی به علت قرار گرفتن در معرض نور با پراکندگی نوترون های حجمی و بارگذاری در محل
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کلمات کلیدی
پراکندگی نوترون، اندازه گیری فشار، پلی کریستال، آلیاژهای آلومینیوم، ویژگی های مکانیکی، پلاستیک کریستال،
موضوعات مرتبط
مهندسی و علوم پایه
مهندسی مواد
دانش مواد (عمومی)
چکیده انگلیسی
In this paper, the degradation of mechanical properties of marine structural aluminum alloy AA5083 and onset of lattice plastic anisotropy subsequent to fire exposure is investigated. For virgin and fire-exposed samples, microstructural characterization is carried out for the first time and changes in lattice specific strain responses under step and continuous axial deformation are studied using novel bulk neutron diffraction. Peak fitting of raw data yields d-spacing values of reflections of interest and allows for lattice specific strain calculations. A reduction in yield stress from 260Â MPa in the virgin material to 120Â MPa in the fire-exposed sample is observed. Virgin material exhibits dynamic strain aging during plastic deformation; this is captured in neutron diffraction measurements. Larger peak broadening for virgin material indicates possible presence of Type II and III residual stresses due to intergranular stress or dislocation stress fields. Stress vs. lattice strain plots show large deviations from linearity post-yield for fire-exposed samples. This is due to strain redistribution among grains as well as grain reorientation. After fire exposure dynamic strain aging does not occur, but individual lattice planes reveal plastic anisotropy in their response to plastic deformation. Results from neutron diffraction, combined with electron backscatter diffraction characterization, provide insight into the yielding mechanisms of AA5083 and effects of fire exposure.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Materials Science and Engineering: A - Volume 700, 17 July 2017, Pages 583-591
Journal: Materials Science and Engineering: A - Volume 700, 17 July 2017, Pages 583-591
نویسندگان
Stephen B. Puplampu, Dayakar Penumadu, Ran Ma, Timothy J. Truster, Robin Woracek, E. Andrew Payzant, Jeffrey R. Bunn,