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| 1 | Microstructure and mechanical properties of hot extruded 6016 aluminum alloy/graphite composites显示文摘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 ℃ for 1 h followed by hot extrusion at 450 ℃. 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(Al_4 C_3). 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. | Mohamed M.El-Sayed Seleman Mohamed M.Z.Ahmed Sabbah Ataya | 2018 | Journal of Materials Science & Technology2018，34，9： | 5 |
| 2 | Strength and Wear Behavior of Mg Alloy AE42 Reinforced with Carbon Short Fibers显示文摘In addition to the advantage of the lightweight of magnesium alloys, magnesium composites have moderate strength and elastic modulus. The proposed application of magnesium composites as diesel truck pistons makes it necessary to assess their wear performance. Little research data have been discussed on wear behavior of Mg alloy AE42 matrix and its composites. Thus, this paper reports wear behavior of magnesium alloy AE42(Mg–Al–Mn—RE; rare earth) and its composite AE42-C, which contains 23 vol% of randomly oriented carbon short fibers. Materials characterization, including density measurements, hardness testing, microstructures investigation, and compression testing at temperatures of 25, 150,and 300 °C, were conducted. Wear tests were performed under various loads and sliding distances. Wear mechanisms were also proposed based on the examination of worn surfaces using optical microscopy and scanning electron microscopy equipped with EDX(energy-dispersive X-ray spectrometry) analysis system. The hardness of AE42-23 vol% C composite is twice the hardness of the Mg matrix alloy AE42. Significant improvements to yield stress and compressive strength at temperatures of 25, 150, and 300 °C of the composite versus the AE42 alloy are achieved. Wear resistance of the composite is improved considerably versus that of the Mg alloy AE42 at the various sliding distances. Smearing of graphite on the worn surface produces a lubricating film that delays change from mild to severe wear of the composite, especially at high loads. EDX analysis of the worn surface shows oxidation of the matrix alloy at higher wear loads, and this mechanism decreases in the presence of carbon fibers under the same loads. Abrasive wear, oxidation, and plastic deformation are the dominant wear mechanisms for the alloy matrix AE42, whereas mainly abrasive wear is the wear mechanism of AE42-23 vol% C composite under the proposed testing conditions. | Sabbah Ataya Naser A.Alsaleh Mohamed M.El-Sayed Seleman | 2019 | Acta Metallurgica Sinica(English Letters)2019，32，1： | 3 |
| 3 | Clinical spectrum of acute otitis media complicating upper respiratory tract viral infection 显示文摘 | Kalu SU Ataya RS McCormick DP | 2011 | Pediatr Infect Dis J2011，30，2： | 1 |
| 4 | Nitrite-generated nitric oxide to protect against intimal hyperplasia formation显示文摘 | Ataya B Tzeng E Zuckerbraun BS | | 0，，06： | 1 |
| 5 | The effect o“factiva t e d ” c y c l o p h o s p h a m i d e o nhuman and rat ovarian granulosacells in vitro显示文摘 | A t a y a K M P y d y n E F R a m a h i -Ataya AJ | 1990 | ReprodToxicol1990，4，2： | 1 |
| 6 | A luteiniz- hag hormone-releasing hormone agonist for the prevention of chemotherapy-induced ovarian follicular loss in rats显示文摘 | Ataya KM McKanna JA Weintraub AM | 1985 | Cancer Res1985，45，8： | 1 |
| 7 | Luteinizing hormone - releasing hormone agonist inhibits cyclophosphamide - induced ovarian follicular depletion in rhesus monkeys 显示文摘 | Ataya K Rao LV Lawrence E | 1995 | Biol Reprod1995，52，2： | 1 |
| 8 | A luteinizing hormone-releasing hormone agonist for the pre- vention of chemotherapy-induced ovarian follicular loss in rats显示文摘 | Ataya KM McKanna JA Weintraub AM | 1985 | Cancer Res1985，45，8： | 1 |
| 9 | Single-phase and two- phase base-catalyzed transesterification of canola oilto fat- ty acid methyl esters at ambient conditions 显示文摘 | Ataya F Dube M A Ternan M | 2006 | Ind Eng Chem Res2006，45，15： | 1 |
| 10 | The effect of 'activated' cyclophosphamide on human and rat ovarian granulosa cells in vitro显示文摘 | Ataya KM Pydyn EF Ramahi-Ataya AJ | 1990 | Reprod Toxicol1990，4，： | 1 |
| 11 | Aluteinizing hormone-releasing hormone agonist for the prevention of chemotherapy-induced ovarian follicularloss in rats显示文摘 | Ataya KM McKanna JA Weintraub AM | 1985 | Cancer Res1985，45，8： | 1 |
| 12 | Comparison of hysterosalpingogra- phy and laparoscopy in the evaluation of infertile women 显示文摘 | Sakar MN Gui T AtayAE | 2008 | Saudi Med J2008，29，9： | 1 |
| 13 | Ahmed, Damages of wind turbine blade trailing edge: Forms, location, and root causes 显示文摘 | Sabbah Ataya Mohamed M Z | 2013 | Engi- neering Failure Analysis2013，，35： | 1 |
| 14 | Radiation-induced lung injury显示文摘 | ATAYA S ELWING J BIDDINGER P | | 0，，04： | 1 |
| 15 | Chematherapy induced premature ovarian failure mechanisms and prevention显示文摘 | Ataya K Moghissi K | 1989 | Steroids1989，54，： | 1 |
| 16 | Design, implementa- tion and scaling up of the balanced scorecard for hospitals in Lebanon: Policy coherence and application lessons for low and middle income countries显示文摘 | El- Jardali F Saleh S Ataya N | 2011 | Health Policy2011，5，6： | 1 |
| 17 | Associations of three lipoprotein lipase gene polymorphisms,lipid profiles and coronary artery disease显示文摘 | Daoud MS Ataya FS Fouad D | 2013 | Biomed Rep2013，1，4： | 1 |
| 18 | A luteinizing hormone - releasing hormone agonist for the prevention of chemotherapy - induced ovarian follicular loss in rats 显示文摘 | Ataya KM McKanna JA Weintraub AM | 1985 | Cancer Res1985，45，： | 1 |
| 19 | A luteinizing hormone-releasing hormone agonist for the prevention of chemotherapy-induced ovarian follicular loss in rats 显示文摘 | Ataya KM McKanna JA Weintraub AM | 1985 | Cancer Res1985，45，8： | 1 |
| 20 | Improving the as- sessment and attribution of effects of development assistance for health 显示文摘 | Ataya N Aluttis C Flahauh A | 2014 | Lancet2014，384，9961： | 1 |
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