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- 검색키워드
- 저자 : Alaneme, K.K. (검색결과 2 건)
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Alaneme, K.K.,Hong, S.M.,Sen, I.,Fleury, E.,Ramamurty, U. Elsevier Sequoia 2010 Materials science & engineering. properties, micro Vol.527 No.18
Small additions of Cu to the SUS 304H, a high temperature austenitic stainless steel, enhance its high temperature strength and creep resistance. As Cu is known to cause embrittlement, the effect of Cu on room temperature mechanical properties that include fracture toughness and fatigue crack threshold of as-solutionized SUS 304H steel were investigated in this work. Experimental results show a linear reduction in yield and ultimate strengths with Cu addition of up to 5wt.% while ductility drops markedly for 5wt.% Cu alloy. However, the fracture toughness and the threshold stress intensity factor range for fatigue crack initiation were found to be nearly invariant with Cu addition. This is because the fracture in this alloy is controlled by the debonding from the matrix of chromium carbide precipitates, as evident from fractography. Cu, on the other hand, remains either in solution or as nano-precipitates and hence does not influence the fracture characteristics. It is concluded that small additions of Cu to 304H will not have adverse effects on its fracture and fatigue behavior.
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Chioma E. Njoku,Joseph A. Omotoyinbo,Kenneth K. Alaneme,Michael O. Daramola 한국섬유공학회 2020 Fibers and polymers Vol.21 No.12
The present study is on the production and characterization of untreated and treated Urena lobata (U. lobata) fiberreinforced polypropylene (PP) composites. The untreated and treated U. lobata/PP composites were produced bycompression moulding at varying weight percents of the fibers (5, 10, 15, 20 25, 30, 35) wt%. The followingcharacterizations were carried out on the treated and untreated U. lobata/PP composites; X-ray diffraction (XRD), FourierTransform Infra-red spectroscopy (FTIR), and Scanning electron microscopy (SEM). Due to enhanced fiber-matrix adhesion,attributed to increased fiber roughness and crystallinity, the alkaline treated U. lobata composites showed enhancedmechanical, structural and morphological properties over the untreated U. lobata reinforced composites. Furthermore, the30 wt% fiber loading, gave the best combination of the mechanical properties, as improvement in tensile strength (2-22 %),percentage elongation (5-26 %), and impact strength (2-19 %) was observed for the treated fiber reinforced compositecompositions. Consequently, the 30 wt.% Urena lobata/PP composite is recommended for the development of PMC basedautomobile components.
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