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RISS 인기검색어
- 검색키워드
- 저자 : Amauri Garcia (검색결과 4 건)
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Adilson V. Rodrigues,Thiago S. Lima,Talita A. Vida,Crystopher Brito,Amauri Garcia,Noé Cheung 대한금속·재료학회 2018 METALS AND MATERIALS International Vol.24 No.5
Al–Cu–Ni alloys are of scientifi c and technological interest due to high strength/high temperature applications, based on thereinforcement originated from the interaction between the Al-rich phase and intermetallic composites. The nature, morphology,size, volume fraction and dispersion of IMCs particles throughout the Al-rich matrix are important factors determiningthe resulting mechanical and chemical properties. The present work aims to evaluate the effect of the addition of 1wt%Ni intoAl–5wt%Cu and Al–15wt%Cu alloys on the solidification rate, macrosegregation, microstructure features and the interrelationsof such characteristics on tensile and corrosion properties. A directional solidification technique is used permitting awide range of microstructural scales to be examined. Experimental growth laws relating the primary and secondary dendriticspacings to growth rate and solidification cooling rate are proposed, and Hall–Petch type equations are derived relating theultimate tensile strength and elongation to the primary dendritic spacing. Considering a compromise between ultimate tensilestrength and corrosion resistance of the examined alloys samples from both alloys castings it is shown that the sampleshaving more refined microstructures are associated with the highest values of such properties.
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Manuel V. Canté,José E. Spinelli,Noé Cheung,Amauri Garcia 대한금속·재료학회 2010 METALS AND MATERIALS International Vol.16 No.1
Al-Ni hypoeutectic alloys were directionally solidified under upward transient heat flow conditions. The aim of the present study is to set up correlations between the as-cast microstructure and the resulting mechanical properties of these alloys. The dependence of primary and secondary dendrite arm spacing on the alloy solute content and on solidification thermal parameters is also analyzed. The results include transient metal/mold heat transfer coefficient, tip growth rate, cooling rate, dendrite arm spacing, ultimate tensile strength, yield tensile strength and elongation. Expressions relating dendrite spacing to solidification thermal parameters and mechanical properties to the scale of the dendritic microstructure have been determined. It was found that the ultimate tensile strength and the yield tensile strength increase with increasing alloy solute content and with decreasing primary and secondary dendrite arm spacing. In contrast, the elongation was found to be independent of both alloy composition and dendritic arrangement.
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Effect of Microstructure Features on the Corrosion Behavior of the Sn‑2.1 wt%Mg Solder Alloy
Clarissa Cruz,Thiago Lima,Marco Soares,Emmanuelle Freitas,Eric Fujiwara,Amauri Garcia,Noé Cheung 대한금속·재료학회 2020 ELECTRONIC MATERIALS LETTERS Vol.16 No.3
The Sn–Mg eutectic alloy is a potential replacement for the traditional Sn-38.1 wt%Pb solder alloy, since lead has been bannedbecause of its risk to human health and the environment. However, studies in the literature related to the Sn-2.1 wt%Mgalloy are restricted to mechanical, electrical and thermal properties. Therefore, this study aims to evaluate the corrosionbehavior of this alloy, as a function of the microstructural arrangement obtained from directional solidifcation performedin a transient heat extraction regime. The thermal solidifcation parameters (solidifcation growth rate and cooling rate) weredetermined along the length of the casting for correlations with microstructural features. The resulting microstructure wascharacterized by scanning electron microscopy, energy-dispersive X-ray spectroscopy and X-ray difraction. Subsequently, theelectrochemical impedance spectroscopy, linear polarization, equivalent circuit and evolution of hydrogen release analyzeswere performed to evaluate the corrosion behavior of the samples in a 0.5 M NaCl solution at 25 °C. Interphase spacingand Mg2Sn fraction were found to infuence the corrosion behavior, showing higher corrosion resistance for a more refnedmicrostructure.
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Talita A. Vida,Crystopher Brito,Thiago S. Lima,José E. Spinelli,Noé Cheung,Amauri Garcia 한국물리학회 2019 Current Applied Physics Vol.19 No.4
Zn-Mg alloys are considered to have potential application in bone implants, since both metals are biocompatible and have biodegradable characteristics. Adding Mg to Zn can boost mechanical and corrosion resistances. However, the literature is very limited on quantifying the interrelation of solidification parameters, microstructural features and mechanical/corrosion properties of Zn-Mg alloys. The present study examines the interrelations of alloy Mg content, macrosegregation effects, morphology and scale of the matrix and eutectic phases, nature of intermetallics and tensile and corrosion properties of near-eutectic Zn-Mg alloys. The alloys samples are obtained by unsteady-state directional solidification resulting in a wide range of solidification thermal parameters and microstructures. We examine microstructural features of both dendritic and complex regular eutectic phases. It is shown that the eutectic exhibits a bimodal pattern with neighboring areas of coarse and fine lamellae. Experimental growth laws relating the primary, secondary and eutectic spacings to the solidification cooling rate and growth rate are proposed. Hall-Petch type equations are derived expressing tensile strength and elongation to dendritic and eutectic spacings. Electrochemical parameters determined by polarization curves during corrosion tests and SEM analyses of corroded areas have shown that the alloy having an essentially eutectic microstructure is associated with better corrosion resistance.
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