EFFECT OF SPIRAL DESIGN ON CRYSTAL ORIENTATION DURING SINGLE CRYSTAL GROWTH
- سال انتشار: 1393
- محل انتشار: مجله علم مواد و مهندسی ایران، دوره: 11، شماره: 2
- کد COI اختصاصی: JR_IJMSEI-11-2_005
- زبان مقاله: انگلیسی
- تعداد مشاهده: 43
نویسندگان
School of Metallurgy and Materials Engineering, Iran University of Science and Technology, Iran, Tehran
Center of Excellence for High Strength Alloys Technology, School of Metallurgy and Materials Engineering, Iran University of Science and Technology, Iran, Tehran.
Center of Excellence for High Strength Alloys Technology, School of Metallurgy and Materials Engineering, Iran University of Science and Technology, Iran, Tehran.
چکیده
Geometrical design of the spiral crystal selector can affect crystal orientation in the final single crystal structure. To achieve a better understanding of conditions associated with the onset of crystal orientation in a spiral crystal selector, temperature field was investigated using three-dimensional finite element method during the process. Different geometries of spiral crystal selector were used to produce Al- ۳ wt. % Cu alloy single crystal using a Bridgman type furnace. The Crystal orientation of the samples was determined using electron backscattered diffraction (EBSD) and optical microscopy. Analysing the temperature field in the crystal selector revealed that, the orientation of growing dendrites against liquidus isotherm in the spiral selector was the reason for crystal misorientation which differs in various selector geometries. Increasing the take-off angle from ۳۵° up to ۴۵° increases the misorientation with respect to direction. Further increase of take-off angle greater than ۴۵° will decrease the crystal misorientation again and the efficiency of the selector to produce a single grain is decreased.کلیدواژه ها
spiral crystal selector, crystal orientation, aluminum-copper alloy, EBSD, numerical simulation.اطلاعات بیشتر در مورد COI
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