Please use this identifier to cite or link to this item: http://hdl.handle.net/10995/90521
Title: Evaluation of the microstructure and mechanical properties of a new modified cast and laser-melted AA7075 alloy
Authors: Khalil, A. M.
Loginova, I. S.
Pozdniakov, A. V.
Mosleh, A. O.
Solonin, A. N.
Issue Date: 2019
Publisher: MDPI AG
Citation: Evaluation of the microstructure and mechanical properties of a new modified cast and laser-melted AA7075 alloy / A. M. Khalil, I. S. Loginova, A. V. Pozdniakov, A. O. Mosleh, et al. . — DOI 10.3390/ma12203430 // Materials. — 2019. — Vol. 20. — Iss. 12. — 3430.
Abstract: The mechanical properties and microstructure of as-cast and homogenized AA7075 were investigated. This alloy was modified by adding transition elements 0.3%Sc + 0.5%Zr, 1%Ti + 0.2%B, and 1%Fe + 1%Ni for use in additive manufacturing applications. After adding Ti + B and Sc + Zr, the structure became uniform and finer with the formation of the Al3(Sc, Zr) and TiB2 phases. Coarse structures were obtained with the formation of an extremely unfavorable morphology, close to a needle-like structure when Fe + Ni was added. The mechanical properties of the modified alloys were increased compared to those of the standard alloy, where the best ultimate tensile strength (UTS) and yield strength (YS) were obtained in the AA7075-TiB alloy compared to the standard alloy in as-cast and homogenized conditions, and the highest hardness value was provided by Fe + Ni additives. The effect of the laser melting process on the microstructure and mechanical properties was investigated. Single laser melts were performed on these alloys using 330 V and a scanning speed of 8 mm/s. During the laser melting, the liquation of the alloying elements occurred due to non-equilibrium solidification. A change in the microstructures was observed within the melt zone and heat-affected zone (HAZ). The hardness of the laser-melted zone (LMZ) after adding the modification elements was increased in comparison with that of the standard alloy. Corrosion testing was performed using a solution of 100 mL distilled water, 3.1 g NaCl, and 1 mL HCl over 5, 10, and 30 min and 1 and 2 h. The corrosion resistance of the alloy modified with FeNi was low because of the non-uniform elemental distribution along the LMZ, but in the case of modification with ScZr and TiB, the corrosion resistance was better compared to that of the standard alloy. © 2019 by the authors.
Keywords: AL-ZN-MG-CU
CORROSION RESISTANCE
LASER MELTING
MECHANICAL PROPERTIES
MICROSTRUCTURE
TRANSITION ELEMENTS
ADDITIVES
ALLOYING ELEMENTS
ALUMINUM COMPOUNDS
ALUMINUM CORROSION
BINARY ALLOYS
COPPER CORROSION
CORROSION RESISTANCE
CORROSION RESISTANT ALLOYS
HARDNESS
HEAT AFFECTED ZONE
IRON ALLOYS
MECHANICAL PROPERTIES
MELTING
MICROSTRUCTURE
MORPHOLOGY
SODIUM CHLORIDE
TENSILE STRENGTH
TRANSITION METALS
AL-ZN-MG-CU
LASER MELTING
MANUFACTURING APPLICATIONS
MICROSTRUCTURE AND MECHANICAL PROPERTIES
NON-EQUILIBRIUM SOLIDIFICATION
PROPERTIES AND MICROSTRUCTURES
TRANSITION ELEMENT
ULTIMATE TENSILE STRENGTH
TITANIUM ALLOYS
URI: http://hdl.handle.net/10995/90521
https://elar.urfu.ru/handle/10995/90521
Access: info:eu-repo/semantics/openAccess
cc-by
SCOPUS ID: 85074226713
WOS ID: 000498402100152
PURE ID: 11103186
ISSN: 1996-1944
DOI: 10.3390/ma12203430
metadata.dc.description.sponsorship: Ministry of Science and Higher Education of the Russian Federation
The author (Asmaa M. Khalil) gratefully acknowledges financial support from the Ministry of Science and Higher Education of the Russian Federation in the framework of Increase Competitiveness Program of MISiS (Support project for young research engineers).
Appears in Collections:Научные публикации, проиндексированные в SCOPUS и WoS CC

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