Abstract—In the present study, binary alloys Al-X (5wt%) where (X =Cr,Ti) and a ternary alloy Al-5Cr-5Ti (all in wt.% unless mentioned) were processed via mechanical alloying technique to investigate its thermal stability and mechanical properties at high temperatures. The powders were mechanically alloyed in a ball mill for 100hrs with a ball to powder ratio of 10:1. The bulk samples of these powders were obtained by sintering in a high frequency induction sintering furnace. Change in the phases and crystallite size was evaluated by X-ray diffractometer. Crystallite size of sintered samples for binary composition Al-5Cr and Al-5Ti was estimated to be 44 nm and 46 nm respectively, whereas for ternary alloy it was noted as 42 nm. The compressive yield strength of Al-5Ti, Al-5Cr and Al-5Ti-5Cr at room temperature was found to be 471MPa, 517MPa and 545MPa respectively. Vickers micro hardness for Al-5Cr, Al-5Ti and Al-5Cr-5Ti at room temperature was found to be 146Hv, 130Hv and 160Hv. The ternary alloy, Al-5Ti-5Cr exhibited superior mechanical and microstructural properties both at ambient and elevated temperatures. The establishment of intermetallic precipitates plausibly played a vital role in enhancement of strength and hardness at higher temperatures.
Index Terms—Aluminum alloys, ball milling, transition metals, thermal stability.
Aamir Khan is with King Saud University, Riyadh, KSA (e-mail: aamirk930@gmail.com).
Muneer Baig is with Prince Sultan University, Riyadh, KSA (e-mail: mbaig@psu.edu.sa).
Abdulhakim Almajid is with Prince Sultan University and King Saud University, Riyadh, KSA (e-mail: aalmajid@ksu.edu.sa).
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Cite: Aamir Khan, Muneer Baig, and Abdulhakim AlMajid, "Effect of Transition Metals on Thermal Stability and Mechanical Properties of Aluminum," International Journal of Materials, Mechanics and Manufacturing vol. 6, no. 6, pp. 369-372, 2018.
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