INFLUENCE OF MECHANICAL ALLOYING AND LEAD CONTENT ON MICROSTRUCTURE, HARDNESS AND TRIBOLOGICAL BEHAVIOR OF ۶۰۶۱ ALUMINIUM ALLOYS

In the present work, one batch of prealloyed ۶۰۶۱Al powder was processed by mixing and another one was ball milled with varying amount of lead content (۰-۱۵ vol. %). These powders were compacted at ۳۰۰MPa and sintered at ۵۹۰˚C under N۲. The instrumented hardness and the young’s modulus of as-sintered ۶۰۶۱Al-Pb alloys were examined as a function of lead content and processing route. The wear test under dry sliding condition has been performed at varying loads (۱۰-۴۰ N) using pin-on-disc tribometer. The microstructure and worn surfaces have been investigated using SEM to evaluate the change in topographical features due to mechanical alloying and lead content. The mechanically alloyed materials showed improved wear characteristics as compared to as-mixed counterpart alloys. Delamination of ۶۰۶۱Al-Pb alloys decreases up to an optimum lead composition in both as-mixed and ball-milled ۶۰۶۱Al-Pb alloys. The results indicated minimum wear rate for as-mixed and ball-milled ۶۰۶۱Al alloy at ۵ and ۱۰ vol. % Pb, respectively.

کلیدواژه ها:

۶۰۶۱Al-Pb alloys ، Mechanical Alloying ، Microstructure ، Wear and Young Modulus.