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Microstructure features and mechanical/electrochemical behavior of directionally solidified Al−6wt.%Cu−5wt.%Ni alloy

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Transactions of Nonferrous Metals Society of China 2021年第6期31卷 1529-1549页

作者： Adilson Vitor RODRIGUES Thiago Soares LIMA Talita Almeida VIDA crystopher brito Amauri GARCIA Noé CHEUNG Department of Manufacturing and Materials Engineering University of Campinas-UNICAMPCampinasSP13083-860Brazil Federal Institute of Education Science and Technology of São Paulo-IFSPBragança PaulistaSP12903-600Brazil São Paulo State University-UNESP Campus of São João da Boa VistaSão João da Boa VistaSP13876-750Brazil

The effects of the addition of 5.0 wt.%Ni to an Al−6wt.%Cu alloy on the solidification cooling rate(T),growth rate(V_(L)),length scale of the representative phase of the microstructure,morphology/distribution of intermetallic compounds(IMCs)and on the resulting properties were *** and tensile properties were determined on samples solidified under a wide range of T along the length of a directionally solidified Al−6wt.%Cu−5.0wt.%Ni alloy *** growth laws were derived relating the evolution of primary(λ_(1))and secondary(λ_(2))dendritic spacings with T and V_(L).The elongation to fracture(δ)and the ultimate tensile strength(σ_(U))were correlated with the inverse of the square root of λ_(1) along the length of the casting by Hall−Petch type experimental *** reinforcing effect provided by the addition of Ni in the alloy composition is shown to surpass that provided by the refinement of the dendritic *** highest corrosion resistance is associated with a microstructure formed by thin IMCs evenly distributed in the interdendritic regions,typical of samples that are solidified under higher T.

关键词： Al−Cu−Ni alloys as-cast microstructures dendritic spacings tensile properties corrosion resistance

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Tailoring microstructure and microhardness of Zn-1wt.%Mg-(0.5wt.%Mn, 0.5wt.%Ca) alloys by solidification cooling rate

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Transactions of Nonferrous Metals Society of China 2021年第4期31卷 1031-1048页

作者： Talita A.VIDA Cássio A.P.SILVA Thiago S.LIMA NoéCHEUNG crystopher brito Amauri GARCIA Department of Manufacturing and Materials Engineering University of Campinas-UNICAMPCampinas 13083-860SPBrazil Campus of São João da Boa Vista São Paulo State University-UNESPSão João da Boa Vista 13876-750SPBrazil

Biodegradable Zn-based alloys, particularly Zn-Mg alloys with the addition of alloying elements, have been intensively investigated aiming to improve both mechanical properties and corrosion behavior. Since such properties are strongly dependent on the alloy microstructure, any evaluation should commence on understanding the conditions influencing its formation. In this study, the effect of the solidification cooling rate on the microstructural evolution of Zn-1 wt.%Mg-(0.5 wt.%Ca, 0.5 wt.%Mn) alloys during transient solidification was investigated. The results show that the microstructures of both alloys have three phases in common: η-Zn dendritic matrix, intermetallic compounds(IMCs) Zn11Mg2, and Zn2 Mg in the eutectic mixture. MnZn9 and two Ca-bearing phases(CaZn11 and CaZn13) are associated with Mn and Ca additions, respectively. These additions are shown to refine the dendritic matrix and the eutectic mixture as compared to the Zn-1 wt.%Mg alloy. A correlation between cooling rate, dendritic or eutectic spacings was developed, thus permitting experimental growth laws to be proposed. Additionally, hardness tests were performed to evaluate the effects of additions of Ca and Mn. Experimental correlations between Vickers microhardness and secondary dendritic spacings were proposed, showing that the microstructural refinement and characteristic Ca and Mn based IMCs induce an increase in hardness as compared to the binary alloy.

关键词： Zn-Mg-(Ca Mn)alloys solidification cooling rate microstructure microhardness

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