کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
7951950 | 1513702 | 2018 | 7 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Effect of cooling rates on the dendritic morphology transition of Mg-6Gd alloy by in situ X-ray radiography
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
مهندسی مواد
شیمی مواد
پیش نمایش صفحه اول مقاله
چکیده انگلیسی
The effect of cooling rate on the transition of dendrite morphology of a Mg-6Gd (wt%) alloy was semiquantitatively analyzed under a constant temperature gradient by using synchrotron X-ray radiographic technique. Results show that equiaxed dendrites, including exotic 'butterfly-shaped' dendrite morphology, dominate at high cooling rate (>1â¯K/s). When the cooling rate decreases in the range of 0.5-1â¯K/s, the equiaxed-to-columnar transition takes place, and solute segregates at the center of two long dendrite arms (LDA) of the 'butterfly-shaped' dendrite. When the cooling rate is lower than 0.3â¯K/s, directional solidification occurs and the columnar dendritic growth direction gradually rotates from the crystalline axis to the thermal gradient direction with an increase in cooling rate. Meanwhile, interface moves faster but the dendrite arm spacing decreases. Floating, collision and rotation of dendrites under convection were also studied in this work.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Materials Science & Technology - Volume 34, Issue 7, July 2018, Pages 1142-1148
Journal: Journal of Materials Science & Technology - Volume 34, Issue 7, July 2018, Pages 1142-1148
نویسندگان
Yongbiao Wang, Liming Peng, Yanzhou Ji, Xiaoxing Cheng, Cunlong Wang, Yujuan Wu, Yanan Fu, Long-Qing Chen,