Effect of Ca modification on the elemental composition, microstructure and tensile properties of Al-7Si-0.3Mg alloy

Zhang, Jiahong; Xing, Shuming; Ao, Xiao-hui; Sun, Peng; Rufen, Wang

doi:10.1007/s12613-019-1838-1

Cited by 5 publications

(13 citation statements)

References 17 publications

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“…The iron-bearing plate/needle length was approximately 60 µm in the A1 alloy, which decreased to approximately ~20 µm in the E1 alloy. Similar results were also found in recent studies [ 22 , 23 ], where Ca addition reduced the length of iron-bearing phases from 30.2 to 3.8 in A356 and AlSi10MnMg alloys. These iron-bearing phases form on the oxide inclusions that are the most abundant solid particles in aluminum alloy melt [ 19 ].…”

Section: Resultssupporting

confidence: 91%

“…However, not all the eutectic phases were modified to fibrous, and there was still a lamellar eutectic structure ( Figure 4 d) in the modified alloy but with significant refinement. Similar modification of Al–Si eutectic structure upon the addition of various amounts of Ca was also reported in previous studies [ 22 , 23 ]. Zhang [ 22 ] reported an addition of 0.06 wt% Ca in A356 alloy to achieve full modification and corresponding enhancement in mechanical properties.…”

Section: Resultssupporting

confidence: 89%

“…Similar modification of Al–Si eutectic structure upon the addition of various amounts of Ca was also reported in previous studies [ 22 , 23 ]. Zhang [ 22 ] reported an addition of 0.06 wt% Ca in A356 alloy to achieve full modification and corresponding enhancement in mechanical properties. However, in the currently investigated alloy, a higher amount of Ca is needed to achieve full modification.…”

Section: Resultssupporting

confidence: 89%

Section: Resultssupporting

confidence: 84%

“…Ca-induced SDAS refinement of the primary α-Al phase was also reported in previous studies [ 19 , 20 , 21 , 22 , 23 ]. Zhang [ 22 ] reported a decrease in the dendritic size of A356 alloy upon the addition of 0.06 wt% Ca. It was stated that refinement was related to increased undercooling by the enrichment of Ca on the solid/liquid interface, and consequently, it restricted the growth of the primary α-Al phase.…”

Section: Resultssupporting

confidence: 84%

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Effect of Al2Ca Addition and Heat Treatment on the Microstructure Modification and Tensile Properties of Hypo-Eutectic Al–Mg–Si Alloys

Shah

Kim

et al. 2021

Materials

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The current study investigated the microstructure modification in Al–6Mg–5Si–0.15Ti alloy (in mass %) through the minor addition of Ca using Mg + Al2Ca master alloy and heat treatment to see their impact on mechanical properties. The microstructure of unmodified alloy (without Ca) consisted of primary Al, primary Mg2Si, binary eutectic Al–Mg2Si, ternary eutectic Al–Mg2Si–Si, and iron-bearing phases. The addition of 0.05 wt% Ca resulted in significant microstructure refinement. In addition to refinement, lamellar to fibrous-type modification of binary eutectic Al–Mg2Si phases was also achieved in Ca-added (modified) alloy. This modification was related to increasing Ca-based intermetallics/compounds in the modified alloy that acted as nucleation sites for binary eutectic Al–Mg2Si phases. The dendritic refinement with Ca addition was related to the fact that it improves the efficacy of Ti-based particles (TiAl3 and TiB2) in the melt to act as nucleation sites. In contrast, the occupation of oxide bifilms by Ca-based phases is expected to force the iron-bearing phases (as iron-bearing phases nucleate at oxide films) to solidify at lower temperatures, thus reducing their size. The as-cast microstructure of these alloys was further modified by subjecting them to solution treatment at 540 °C for 6 h, which broke the eutectic structure and redistributed Mg2Si and Si phases in Al-matrix. Subsequent aging treatment caused a dramatic increase in the tensile strength of these alloys, and tensile strength of 291 MPa (with El% of 0.45%) and 327 MPa (with El% of 0.76%) was achieved for the unmodified alloy and modified alloy, respectively. Higher tensile strength and elongation of the modified alloy than unmodified alloy was attributed to refined dendritic structure and modified second phases.

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Section: Resultssupporting

confidence: 91%

Section: Resultssupporting

confidence: 89%

Section: Resultssupporting

confidence: 89%

Section: Resultssupporting

confidence: 84%

Section: Resultssupporting

confidence: 84%

See 3 more Smart Citations

Effect of Al2Ca Addition and Heat Treatment on the Microstructure Modification and Tensile Properties of Hypo-Eutectic Al–Mg–Si Alloys

Shah

Kim

et al. 2021

Materials

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Effect of TiB2 and Al3Ti on the microstructure, mechanical properties and fracture behaviour of near eutectic Al-12.6Si alloy

Basak

Biswas

Patra

et al. 2021

Int J Miner Metall Mater

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Thermochemical modelling and mechanical property of the Al-7.6Si-xZr alloy

Biswas

Das

et al. 2023

Materials Science and Technology

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This study utilised the gravity casting method to modify hypoeutectic Al-7.6Si alloys with Zr at varying weight percentages (0.1%, 0.2%, and 0.3%). The unmodified alloy typically consists of a needle or platelike eutectic silicon within the dendritic α-Al phase. The addition of Zr increases the liquidus temperature of the alloy and results in the formation of ZrSi and ZrSi2 compounds, which act as nucleation sites for both the eutectic Si and α-Al grains. As a result, the needle or platelike eutectic silicon transforms into a fibrous structure with a more uniform distribution, and the α-Al phase becomes finer and globular. These microstructural changes lead to improved bulk hardness, ductility, and mechanical properties of the alloy.

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Effect of Ca modification on the elemental composition, microstructure and tensile properties of Al-7Si-0.3Mg alloy

Cited by 5 publications

References 17 publications

Effect of Al2Ca Addition and Heat Treatment on the Microstructure Modification and Tensile Properties of Hypo-Eutectic Al–Mg–Si Alloys

Effect of Al2Ca Addition and Heat Treatment on the Microstructure Modification and Tensile Properties of Hypo-Eutectic Al–Mg–Si Alloys

Effect of TiB2 and Al3Ti on the microstructure, mechanical properties and fracture behaviour of near eutectic Al-12.6Si alloy

Thermochemical modelling and mechanical property of the Al-7.6Si-xZr alloy

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