GEOMETRY OF RAPIDLY SOLIDIFIED RIBBONS FOR MILITARY APPLICATIONS | ||||
| International Conference on Aerospace Sciences and Aviation Technology | ||||
| Article 60, Volume 1, A.S.A.T. CONFERENCE 14-16 May 1985 r CAIRO, May 1985, Page 709-723 PDF (2.8 MB) | ||||
| Document Type: Original Article | ||||
| DOI: 10.21608/asat.1985.26550 | ||||
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| Authors | ||||
| M. F. Abdel-Ghafar; N. A. El-Mahallawy; M. A. Taha | ||||
| Department of Design and Production Engineering, Faculty of Engineering, Ain-Shams University, Abbaseia, Cairo. | ||||
| Abstract | ||||
| This work aims to study the influence of processing variables in melt spinning - which is one of the rapid solidification processes (RSP) - on the geometry of the ribbons produced directly from the melt. The R5P is one of the recent manufacturing techniques, in which the final products - ribbons and fibers - could be produced directly by solidification of liquid alloys, thus saving all further conventional metal forming processes usually carried out. In this investigation, a melt spinning apparatus was designed and con-structed in order to produce ribbons from the melt using a rotating substrate in the form of wheel. The alloys studied were aluminium alloys with 0, 5.23, 13.46 and 33 wt% Cu. The processing variables used were as follows: substrate linear velocity (v) ranging from 2 to 20 m.sI, injection pressure of the melt (P) ranging from 2.9 X 104 to 6.8 X 104 N.m-2, substrate thermal conductivity (K) ranging from 43.3 to 386.6 W.m-I.K-1, melt superheating temperature ( AT) ranging from 0 to 150 K, nozzle - substrate distance 0-0 ranging from 5 to 20 mm and nozzle diameter (d) ranging from 0.5 to 2 mm. The geometry of the product; ribbon thickness (t), width (w), length (L) and surface roughness (Rt) have been measured and they were correlated with the different process-ing variables. It is found that v plays the most important role in determining the geometry parameters, where a critical velocity of 5 m.s 1 is found. Varying v up to this value causes increase in w and L and a decrease in t. Increasing v beyond this value causes decrease in w, L and t. | ||||
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