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Microstructural Morphologies and Experimental Growth Laws during Solidification of Monotectic and Hypermonotectic Al-pb Alloys

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Journal of Materials Science & Technology 2014年第4期30卷 401-407页

作者： adrina p.silva Amauri Garcia José E.Spinelli Department of Materials Engineering University of Campinas-UNICAMP Department of Materials Engineering Federal University of Sao Carlos-UFSCar

AI-pb alloys with monotectic and hypermonotectic compositions were directionally solidified under unsteady- state heat flow conditions. The cooling curves recorded during solidification allowed solidification thermal parameters such as the cooling rate （T）, growth rate （v） and thermal gradient （G） to be experimentally determined. Different microstructural patterns have been associated with the alloy solute content, i.e., AI-1.2 and 2.1 wt% pb. A sequence of morphologies from the bottom to the top of the A1-1.2 wt% pb alloy casting （monotectic） can be observed： pb-rich droplets in the aluminum-rich matrix, followed by a region of microstructural transition formed by droplets and fibers and finally by a mixture of fibers and strings of pearls. A completely fibrous structure （without transition） has been observed along the entire AI-2.1 wt% pb alloy casting （hypermonotectic）. The interphase spacing （λ） was measured along the casting length, and experimental correlations between λand experimental solidification thermal parameters have been established. power laws with a -2.2 exponent expressing λ as a function of the growth rate, v, were found to better represent the fibrous growth of both AI-pb alloys. Moreover, a single experimental law expressing λ as a function of both G and v was found to describe the fibrous growth of both the monotectic and the hypermonotectic alloys experimentally examined.

关键词： Aluminum alloys Casting phase transformation

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Horizontally Solidified Al-3 wt%Cu-(0.5 wt%Mg)Alloys:Tailoring Thermal parameters,Microstructure,Microhardness,and Corrosion Behavior

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Acta Metallurgica Sinica(English Letters) 2019年第6期32卷 695-709页

作者： Andre Barros Clarissa Cruz adrina p.silva Noe Cheung Amauri Garcia Otavio Rocha Antonio Moreira Institute of Technology Federal University of Para-UFPABelemPA 66075-110Brazil Federal Institute of Education Science and Technology of Para-IFPABelemPA 66093-020Brazil Department of Manufacturing and Materials Engineering University of Campinas-UNICAMPCampinasSP 13083-860Brazil

In the present experimental investigation,Al–3 wt%Cu and Al–3 wt%Cu–0.5 wt%Mg alloys castings are produced by a horizontal solidification technique with a view to examining the interrelationship among growth rate(GR),cooling rate(CR),secondary dendrite arm spacing(λ2),Vickers microhardness(HV),and corrosion behavior in a 0.5 M NaCl *** intermetallic phases of the as-solidified microstructures,that is,h-Al2Cu,S–Al2CuMg,and x-Al7Cu2 Fe,are subjected to a comprehensive characterization by using calculations provided by computational thermodynamics software,optical microscopy,and scanning electron microscopy/energy-dispersive ***,electrochemical impedance spectroscopy and potentiodynamic polarization tests have been applied to analyze the corrosion performance of samples of both alloys ***–petch-type equations are proposed to represent the HV dependence onλ*** is shown that the addition of Mg to the Al–Cu alloy has led to a considerable increase in HV;however,the Al–Cu binary alloy is shown to have lower corrosion current density(icorr)as well as higher polarization resistance as compared to the corresponding results of the Al–Cu–Mg ternary alloy.

关键词： Aluminum alloys Solidification Dendritic microstructure Intermetallic phases Microhardness Corrosion resistance

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