Determination of solidification sequence of the AlMg9 alloy

Brodarac, Zdenka Zovko; Unkić, Faruk; Medved, Jožef; Mrvar, Primož

doi:10.4149/km_2012_1_59

Cited by 7 publications

(11 citation statements)

References 5 publications

(10 reference statements)

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“…The primary strengthening precipitate in Al-Li alloys is the metastable Al 3 Li (δ ) phase [3]. Unlike intermetallic precipitates in 2XXX and 7XXX series of Al alloys, the δ phase stays spherical and coherent with the α Al matrix at high temperatures retaining the stability of microstructure and mechanical properties [4][5][6][7]. The preferred precipitation of the δ phase in Al-Li alloys can be achieved with Mg additions.…”

Section: Introductionmentioning

confidence: 99%

Determination of Al-2.18Mg-1.92Li Alloy’s Microstructure Degradation in Corrosive Environment

et al. 2021

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The utilization of aluminum-lithium-magnesium (Al-Li-Mg) alloys in the transportation industry is enabled by excellent engineering properties. The mechanical properties and corrosion resistance are influenced by the microstructure development comprehending the solidification of coherent strengthening precipitates, precipitation of course and angular equilibrium phases as well as the formation and widening of the Precipitate-free zone. The research was performed to determine the microstructure degradation of Al-2.18Mg-1.92Li alloy in a corrosive environment using electrochemical measurements. The solidification sequence of the Al-2.18Mg-1.92Li alloy, obtained using Thermo–Calc software support, indicated the transformation of the αAl dendritic network and precipitation of AlLi (δ), Al2LiMg (T), and Al8Mg5 (β) phase. All of the phases are anodic with respect to the αAl enabling microstructure degradation. To achieve higher microstructure stability, the sample was solution hardened at 520 °C. However, the sample in as-cast condition showed a lower corrosion potential (−749.84 mV) and corrosion rate (17.01 mm/year) with respect to the solution-hardened sample (−752.52 mV, 51.24 mm/year). Higher microstructure degradation of the solution-hardened sample is a consequence of δ phase precipitation at the grain boundaries and inside the grain of αAl, leading to intergranular corrosion and cavity formation. The δ phase precipitates from the Li and Mg enriched the αAl solid solution at the solution-hardening temperature.

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Section: Introductionmentioning

confidence: 99%

Determination of Al-2.18Mg-1.92Li Alloy’s Microstructure Degradation in Corrosive Environment

et al. 2021

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“…Synergy of alloying and trace elements contributes to the wide range of intermetallic phase evolution [1][2][3][4][5][6]. The content of secondary alloying elements (Mg, Cu) significantly changes the solidification path of the Al-Si alloy [7][8][9][10][11][12][13][14][15][16][17][18][19]. The addition of secondary elements, melt treatment, and solidification conditions have a synergy effect on the crystallization kinetic and therefore on the properties' development as well [20][21][22][23][24][25][26].…”

Section: Introductionmentioning

confidence: 99%

“…[9,12,13]. High Mg content comprehends to the Al 8 Mg 5 phase precipitation at the grain boundaries [14]. The yield strength, tensile strength, and elongation of the as-cast Al-Si-Mg alloys can vary with the Mg content [15].…”

Section: Introductionmentioning

confidence: 99%

Influence of Copper Addition in AlSi7MgCu Alloy on Microstructure Development and Tensile Strength Improvement

Stanić¹,

Brodarac

2020

Metals

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Commercial AlSi7Mg alloy represents the usual choice for complex geometry casting production. The market imperative to improve mechanical properties imposed the design of new chemical composition of AlSi7MgCu alloy with high content of Cu (up to 1.435 wt.%). This represents a challenge in order to achieve advanced properties. The interaction of a number of alloying (Si, Mg, Cu) and trace elements (Fe, Mn) influenced a wide range of complex reactions occurring and therefore leading to intermetallic phase precipitation. The characterization of novel chemical composition interaction and its solidification sequence was achieved by modelling an equilibrium phase diagram, simultaneously performing both thermal analysis and metallographic investigations. Copper influence was indicated in the whole solidification process starting with infiltration in modified Chinese script phase Al15(Fe,Mn,Cu)3Si2, beside common intermetallic Al5FeSi. Copper addition encourages formation of compact complex intermetallic phases Al5Cu2Mg8Si6 and Al8(Fe,Mn,Cu)Mg3Si6. Solidification ended with secondary eutectic αAl + Al2Cu + βSi. Microstructure investigation allows volume reconstruction of the microstructure and distribution of particular phases. Chemical compositions enriched in copper content and developed microstructural constituent through solidification sequence of AlSi7MgCu alloy contribute to a significant increase in mechanical properties already in an as-cast state.

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“…Understanding of the solidification mechanism of AlSi9MgMn alloy and resulting microstructure represents a challenge due to number of influenced parameters. Microstructure development is strongly dependent from chemical composition and thermodynamic conditions during solidification process [17][18][19][20]. Crystallization kinetics influence on elements interaction intensity, followed with change in intermetallics´ chemical composition and morphology.…”

Section: Introductionmentioning

confidence: 99%

“…HPDC technology favourably affect the microstructure development through evolution of intermetallic Al 15 (Mn,Fe) 3 Si 2 phase in globular / polyhedron manner and thus enhancing mechanical properties of castings such as ductility and toughness. Synergy of thermodynamic calculation and thermal analyses reveals solidification sequence with corresponded temperatures in correlation to microstructure investigation as follows: development of primary dendrite network, precipitation of high temperature Al 15 (Mn,Fe) 3 Si 2 phase, main eutectic reaction, intermetallic iron-magnesium phase precipitation Al 8 Mg 3 FeSi 6 and secondary eutectic phase α Al + Mg 2 Si as a final solidifying phase [21][22][23][24][25][26][27][28].…”

Section: Introductionmentioning

confidence: 99%

Influence of cooling rate on microstructure development of AlSi9MgMn alloy

Stanić

Brodarac

2020

J min metall B Metall

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Aluminum alloys are widely applied in automotive, aircraft, food, and building industries. Multicomponent technical AlSi9MgMn alloy is primarily intended for high cooling rate technology. Controlled addition of alloying elements such as iron and manganese as well as magnesium can improve mechanical and technological properties of the final casting depending on the cooling conditions during solidification. The aim of this investigation is the characterization of AlSi9MgMn alloy microstructure and mechanical properties at lower cooling rates than those for which this alloy was primarily developed. Thermodynamic calculation and thermal analyses revealed solidification sequence in correlation to the microstructure investigation as follows: development of primary dendrite network, precipitation of high temperature Al15(Mn,Fe)3Si2 and Al5FeSi phases, main eutectic reaction, precipitation of intermetallic Al8Mg3FeSi6 phase, and Mg2Si as a final solidifying phase. Influence of microstructure features investigation and cooling rate reveals significant Al15(Mn,Fe)3Si2 morphology change from Chinese script morphology at low, irregular broken Chinese script morphology at medium, and globular morphology at high cooling rate. High manganese content in AlSi9MgMn alloy together with high cooling rate enables the increase of Fe+Mn total amount in the intermetallic Al15(Mn,Fe)3Si2 phase and encourage favourable morphology development, all resulting in enhanced mechanical properties in as-cast state.

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Determination of solidification sequence of the AlMg9 alloy

Cited by 7 publications

References 5 publications

Determination of Al-2.18Mg-1.92Li Alloy’s Microstructure Degradation in Corrosive Environment

Determination of Al-2.18Mg-1.92Li Alloy’s Microstructure Degradation in Corrosive Environment

Influence of Copper Addition in AlSi7MgCu Alloy on Microstructure Development and Tensile Strength Improvement

Influence of cooling rate on microstructure development of AlSi9MgMn alloy

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