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Effect of partition coefficient on microsegregation during solidification of aluminium alloys 被引量:5
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作者 m.H.Avazkonandeh-Gharavol m.haddad-sabzevar H.Fredriksson 《International Journal of Minerals,Metallurgy and Materials》 SCIE EI CAS CSCD 2014年第10期980-989,共10页
In the modeling of microsegregation, the partition coefficient is usually calculated using data from the equilibrium phase diagrams. The aim of this study was to experimentally and theoretically analyze the partition ... In the modeling of microsegregation, the partition coefficient is usually calculated using data from the equilibrium phase diagrams. The aim of this study was to experimentally and theoretically analyze the partition coefficient in binary aluminum--copper alloys. The sam- ples were analyzed by differential thermal analysis (DTA), which were melted and quenched from different temperatures during solidifica- tion. The mass fraction and composition of phases were measured by image processing and scanning electron microscopy (SEM) equipped with an energy-dispersive X-ray spectroscopy (EDS) unit. These data were used to calculate as the experimental partition coefficients with four different methods. The experimental and equilibrium partition coefficients were used to model the concentration profile in the primary phase. The modeling results show that the profiles calculated by the experimental partition coefficients are more consistent with the experi- mental profiles, compared to those calculated using the equilibrium partition coefficients. 展开更多
关键词 aluminum copper alloys SOLIDIFICATION partition coefficient MICROSEGREGATION numerical modeling differential thermal analysis
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Effect of filler metal on microstructure and mechanical properties of manganese-aluminum bronze repair welds 被引量:2
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作者 m.R.m.RZADEHRAHNI B.BEIDOKHTI m.haddad-sabzevar 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS CSCD 2017年第3期507-513,共7页
The repair welding of UNS C95700manganese?aluminum bronze plates was done using different filler metals.Themicrostructure and mechanical properties of welds were studied.The main microstructural constituents wereα,β... The repair welding of UNS C95700manganese?aluminum bronze plates was done using different filler metals.Themicrostructure and mechanical properties of welds were studied.The main microstructural constituents wereα,βandκphases withdifferent morphologies.The addition of manganese decreased the percentage ofαphase in the microstructure of weldments from80%(Mn-free weld)to57%(12.5%Mn weld,mass fraction).The morphology ofκphase was lamellar in high nickel specimens andit was changed to a globular morphology for high manganese welds.Although the application of high manganese filler metal yieldedthe higher tensile and bending strengths of weldment compared with the weld using high nickel filler material,the optimummechanical properties of repair welds were obtained using a non-alloy filler material(ERCuAl-A2)for the underlay and highmanganese filler metal(ERCuMnNiAl)for filling passes.This weld presented an increase of39%in tensile strength compared withthe base metal,and no cracking was observed after bending test. 展开更多
关键词 manganese.aluminum bronze WELDING filler metal MICROSTRUCTURE mechanical properties
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