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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 | Reduced sarcoplasmic reticulum Ca2 + uptake an d increased Na + -Ca2 + exchanger expression in left ventricle myocardium of dogs with progression of heart failure 显示文摘 | Mishra S Sabbah HN Rastogi S | 2005 | Heart Vessels2005，20，1： | 1 |
| 4 | The cellular and physiologic effects of betablockers in heart failure显示文摘 | Sabbah H N | 1999 | Clin Cardiol1999，22，5： | 1 |
| 5 | CT and MRI findings in primitive pituitary abscess: a case report and review of literature 显示文摘 | Sabbah P Bonardel G Herve R | 1999 | J Neuroradiol1999，26，3： | 1 |
| 6 | Molecular signature and therapeutic perspective of the epithelial - to - mesen- chymal transitions in epithelial cancers显示文摘 | Sabbah M Emami S Redeuilh G | 2008 | Drug Resist Up- dat2008，11，45： | 1 |
| 7 | The pork-cat syndrome: RAST inhibition test with Fel d 1 显示文摘 | Sabbah A Rousseau C Lauret MG | 1994 | Allerglmmunol (Paris)1994，26，： | 1 |
| 8 | Parasympathetic nervous system and heart failure: pathophysiology and potential implications for therapy 显示文摘 | Olshansky B Sabbah HN Hauptman P J | 2008 | Circulation2008，118，： | 1 |
| 9 | Assessment and comparison of intraoperative and postoperative pain associated with NovaSure and Therma choice endometrial ablation systems 显示文摘 | Laberge PY Sabbah R Fortin C | 2003 | J Am Assoc Gynecol Laparosc2003，10，2： | 1 |
| 10 | Fatal anaphylaxis after eating wild boar meat in a patient with pork-cat syndrome 显示文摘 | Drouet M Sabbah A Le Sellin J | 2001 | Allerg Immunol (Paris)2001，33，： | 1 |
| 11 | Adipose-derived mesenchymal stem cellsmodulate the immune response in chronice-qerimeiital autoimmune encephalomyelitismode显示文摘 | Shalaby SM Sabbah NA Saber T | 2016 | IUBMB life2016，68，2： | 1 |
| 12 | Ventricular remodeling:consequences and therapy显示文摘 | Coldstein S | 1993 | Eur Heart1993，14，： | 1 |
| 13 | A canine model of chronic heart failure produced by multiple sequential coronary microembolizations 显示文摘 | Sabbah H N Stein P D Kono T | 1991 | Am J Physiol1991，260，42： | 1 |
| 14 | Molecular sig- nature and therapeutic perspective of the epithelial-to-mes- enchymal transitions in epithelial cancers显示文摘 | SABBAH M EMAMI S REDEUILH G | 2008 | Drug Resistance Updates2008，11，45： | 1 |
| 15 | Progression of heart failure: a role for interstitial fibrosis显示文摘 | SABBAH H N SHAROV V G LESCH M | 1995 | Mol Cell Biochem1995，147，： | 1 |
| 16 | A canine model of chronic heart failure produced by multiple sequential coronary microembolization显示文摘 | SABBAH HN STEIN PD KONO T | 1991 | Am J Physiol1991，260，4： | 1 |
| 17 | Diabetes management in the millennium using insulin Pump therapy显示文摘 | Bode BW Sabbah HT Gross TM | 2002 | Diabetes Metab Res Rev2002，，： | 1 |
| 18 | Functional MR imaging in assessment of language dominance in epileptic patients 显示文摘 | Sabbah P Chassoux F Leveque C | 2003 | Neurimage2003，18，2： | 1 |
| 19 | Disease -assciated autoantibodies and HLA - DQB 1 genotypes in children with newly diagnosed insulin-dependent diabetes mellitus (IDDM) 显示文摘 | Sabbah E Savola K Kuhmala P | 1999 | Clin Exp Immunol1999，116，1： | 1 |
| 20 | Targeting myocardial substrate metabolism in heart failure: potential for new therapies 显示文摘 | Ardehali H Sabbah H N Burke M A | 2012 | Eur J Heart Fail2012，14，2： | 1 |
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