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RISS 인기검색어
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- 저자 : Ercan Karaköse (검색결과 2 건)
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Microstructure Properties and Microhardness of Rapidly Solidified Al64Cu20Fe12Si4 Quasicrystal Alloy
Ercan Karaköse,Mustafa Keskin 대한금속·재료학회 2012 METALS AND MATERIALS International Vol.18 No.2
This paper presents differences in the microstructure and microhardness properties of conventional casting (ingot) and rapidly solidified Al64Cu20Fe12Si4 quasicrystal (QC) alloys. The phases present in the Al64Cu20Fe12Si4ingot alloy were determined to be icosahedral quasicrystalline (IQC) Ψ-Al65Cu20Fe15, cubic β-AlFe, tetragonal θ-Al2Cu, and monoclinic λ-A13Fe4 phases, whereas only IQC Ψ-Al65Cu20Fe15 and cubic β-AlFe phases were identified in the rapidly solidified alloy. The microhardness value of the melt spun alloy was measured to be approximately 790 kg/mm2. Microhardness increases with increasing solidification rates.
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Microhardness and Morphologic Characteristics of Rapidly Solidified Al–12Si–8Ni–5Nd Alloy
Ercan Karaköse,Mustafa Keskin 대한금속·재료학회 2010 METALS AND MATERIALS International Vol.16 No.3
Al–Si–Ni–Nd alloys with a nominal composition of Al–12 wt.% Si–8 wt.% Ni–5 wt.% Nd alloy are prepared by a conventional casting (ingot) and melt spinning technique at different cooling rates (v). The effects of the rapid solidification rate on the microstructures and microhardness performances of the specimen alloys are investigated in detail. The results obtained by the XRD, SEM and DSC show that the ingot and melt spun alloys have a multiphase structure. When v is 5 m/s, the alloy consists of four phases namely α-Al,intermetallic Al3Ni, Al11Nd3, and fcc Si. The melt-spun ribbons are completely composed of α-Al and eutectic Si phases, and primary silicon is not observed when v increases to 20 m/s, 25 m/s, 30 m/s and 35 m/s. The XRD analysis indicated that the solubility of Si in the α-Al matrix increases greatly with the rapid solidification. The change in microhardness is discussed based on the microstructural observations. The microhardness values of the melt spun ribbons are about three times higher than those of ingot counterparts.
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