Abstract
The present paper reports on the preparation of various Al-5Ti master alloys by the reaction of halide salt (K2TiF6) with molten Al in an induction furnace. The master alloys are supposed to be used for the in-situ processing of Al-TiC Metal Matrix Composites. During the preparation of these master alloys the reaction temperature was varied from 800-1000℃ with the intervals of 100℃, while the reaction time was varied at 45, 60 and 75 min. The binary master alloys prepared were characterized using image analyzer and particle size was measured. It was found that the master alloy Al-5Ti prepared at 8000C, and 45 minutes had a minimum particle size of 9.0 micrometer. Also it is observed that the population of particles less than 10 micrometer decreases at higher reaction temperature.
Highlights
Applications of composite materials are among the most important developments in materials engineering in recent years
The particle sizes of the various binary Al-5Ti master alloys prepared were studied by using Image analyzer via quantitative metallographic technique
This technique was used to get an idea of the size of the Al3Ti particles in the master alloys prepared in an induction furnace under different processing conditions
Summary
Applications of composite materials are among the most important developments in materials engineering in recent years. Sivaramakrishnan [4, 5] successfully prepared Al-Ti and Al-Ti-B master alloys in both wire and pellet form by the reaction of B2O3 and TiO3 with molten aluminium They found that these alloys were better than grain refiners compared to some of the commercial grain refiners used in their studies. Zhuxian [6] have prepared Al-Ti-B master alloys by the thermal reduction and electrolysis of titanium dioxide and diboron trioxide in cryolite alumina melts in the presence of aluminium at 1000oC. They were successful in preparing master alloy containing up to 4% Ti and close to 2% B. Mechanical alloying has the disadvantage of high production cost, low production rate and the possibility of contamination from the milling media
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