کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
7951903 1513700 2018 12 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Microstructure and mechanical properties of hot extruded 6016 aluminum alloy/graphite composites
ترجمه فارسی عنوان
خواص میکروارگانیسم و ​​خواص مکانیکی کامپوزیت های آلومینیوم / گرافیت 6016 گرم اکسترود شده
موضوعات مرتبط
مهندسی و علوم پایه مهندسی مواد شیمی مواد
چکیده انگلیسی
The incorporation of graphite particles into AA6016 aluminum alloy matrix to fabricate metal/ceramic composites is still a great challenge and various parameters should be considered. In this study, dense AA6016 aluminum alloy/(0-20 wt%) graphite composites have successfully been fabricated by powder metallurgy process. At first, the mixed aluminum and graphite powders were cold compacted at 200 MPa and then sintered at 500 °C for 1 h followed by hot extrusion at 450 °C. The influence of ceramic phases (free graphite and in-situ formed carbides) on microstructure, physical and mechanical properties of the produced composites were finally investigated. The results show that the fabricated composites have a relative density of over 98%. SEM observations indicate that the graphite has a good dispersion in the alloy matrix even at high graphite content. Hardness of all the produced composites was higher than that of aluminum alloy matrix. No cracks were observed at strain less than 23% for all hot extruded materials. Compressive strength, reduction in height, ultimate tensile stress, fracture stress, yield stress, and fracture strain of all Al/graphite composites were determined by high precision second order equations. Both compressive and ultimate tensile strengths have been correlated to microstructure constituents with focusing on the in-situ formed ceramic phases, silicon carbide (SiC) and aluminum carbide (Al4C3). The ductile fracture mode of the produced composites became less dominant with increasing free graphite content and in-situ formed carbides. Wear resistance of Al/graphite composites was increased with increasing graphite content. Aluminum/20 wt% graphite composite exhibited superior wear resistance over that of AA6016 aluminum alloy.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Materials Science & Technology - Volume 34, Issue 9, September 2018, Pages 1580-1591
نویسندگان
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