18 آبان 1403
حسين اسكندري

حسین اسکندری

مرتبه علمی: دانشیار
نشانی: دانشکده مهندسی - گروه مهندسی مکانیک
تحصیلات: دکترای تخصصی / مهندسی مواد
تلفن: 07731222153
دانشکده: دانشکده مهندسی

مشخصات پژوهش

عنوان Production and characterization of an advanced AA6061-Graphene-TiB2 hybrid surface nanocomposite by multi-pass friction stir processing
نوع پژوهش مقالات در نشریات
کلیدواژه‌ها
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مجله SURFACE & COATINGS TECHNOLOGY
شناسه DOI
پژوهشگران مهدی نظری (نفر اول) ، حسین اسکندری (نفر دوم) ، فرزاد خدابخشی (نفر سوم)

چکیده

In this study, by the implementation of multi-pass friction stir processing (FSP) an advanced AA6061-Graphene- TiB2 hybrid surface nanocomposite is produced in contrast to the AA6061-Graphene and AA6061-TiB2 single composites. Effects of micro-sized TiB2 (10-30 wt%) and nano-sized graphene (0.5-2 wt%) particles on the microstructure and mechanical property of aluminum alloy are investigated. Moderate chemical composition as ~20 wt% TiB2 and 1 wt% graphene for the hybrid nanocomposite system yielded the best combinations of mechanical property overcome the wear-strength trade-off. Such optimum incorporation of hybrid inclusions mixture led a hardness increasing up to about two times higher, a yield strength improvement up to ~225 MPa (~300% increasing ratio), and an elongation loss down to ~9%. A considerable reduction in the coefficient of friction ~23% is revealed with the dominant contribution of sliding wear fractographic features on the worn-out fracture surface due to the presence of graphene in the nanocomposite structure acting as the lubricant agent.