Study On The Effect Of Alumina Reinforcements On Fe-Cr Matrix Composite

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dc.contributor.authorShamsuddin, Saidatulakmar
dc.date.accessioned2018-06-26T02:30:31Z
dc.date.available2018-06-26T02:30:31Z
dc.date.issued2011-01
dc.description.abstractMetal Matrix Composites (MMCs) have shown significance improvement from intellectual interest in scientific world to the technological and commercial applications for over the past three decades. In the present study, an attempt to fabricate a new MMC of Fe-Cr matrix composites reinforced with Al2O3 particles through conventional Powder Metallurgy (PM) method was successfully obtained. No phases other than the constituent were developed in the composites after sintering. The peaks of the XRD patterns have been identified as belonging to the phases of the Fe, Cr and Al2O3 and the EDX analysis of the composites confirm the existence of Fe, Cr, Al and O. Based on the Archimedes’ principle, the density and porosity are computed. Vickers micro hardness, wear resistance characteristics, compressive strength behavior and SEM evaluations were established to determine the optimum condition. Using a binder of 2 wt% stearic acid, mixing duration of 30 minutes, uni-axial compaction pressure of 750 MPa and heating rate of 10C/min in vacuum condition was found as an optimal condition to fabricate this composite. Higher sintering temperature promotes better densification and mechanical properties. The compressive strength value for unreinforced sample, sample with 5 wt% Al2O3 and sample with 25 wt% Al2O3 are 628 MPa, 648 MPa and 221 MPa respectively. The amount of 5 wt% Al2O3 particles revealed homogeneous microstructure, better densification and stronger compressive strength compared to the unreinforced sample and those samples with larger content of Al2O3 particles. Nevertheless, optimum reading in Vickers micro hardness and wear resistance were found in those composites reinforced with 20 wt% Al2O3 particles. Increasing to 25 wt% of Al2O3 particles results in a decrease in mechanical properties due to agglomeration of the reinforcement particles in the matrix that lower the interaction between matrix and reinforcement. The wear coefficient value for unreinforced sample, sample with 20 wt% Al2O3 and sample with 25 wt% Al2O3 are 3.28×10-11, 2.43×10-11 and 2.77 ×10-11 respectively. Reinforcing the Fe-Cr matrix with Al2O3 particles bigger than 13 μm deteriorated the microstructure and mechanical properties of the composites. The wear coefficient for sample reinforced with 13 μm Al2O3 particles is 2.46 ×10-11 with compressive strength of 278 MPa. Meanwhile for sample reinforced with 64 μm Al2O3 particles its wear coefficient is 5.09 ×10-11 and compressive strength is 81 MPa.en_US
dc.identifier.urihttp://hdl.handle.net/123456789/5782
dc.language.isoenen_US
dc.publisherUniversiti Sains Malaysiaen_US
dc.subjectThe effect of alumina reinforcementsen_US
dc.subjecton fe-cr matrix compositeen_US
dc.titleStudy On The Effect Of Alumina Reinforcements On Fe-Cr Matrix Compositeen_US
dc.typeThesisen_US
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