Alloy Composition and Dendrite Arm Spacing in Al-Si-Cu-Mg-Fe Alloys

Sivarupan, Tharmalingam; Cáceres, C. H.; Taylor, J. A.

doi:10.1007/s11661-013-1768-x

Cited by 38 publications

(15 citation statements)

References 19 publications

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“…The change of major strengthening phases precipitated, such as Mg 2 Si in AC0, Mg 2 Si + Al 5 Cu 2 Mg 8 Si 6 in AC1 and Al 2 Cu + Al 5 Cu 2 Mg 8 Si 6 in AC2, AC3 and AC4, is controlled by the concentration ratio of Cu/Mg. Moreover, the addition of Cu leads to the increase in microporosity, since interdendritic Cu-rich phases form at a lower temperature than Al-Si eutectic phases which leads to the inadequate feeding during the solidification process [18]. Fig.…”

Section: Methodsmentioning

confidence: 99%

“…With trace alloying, such as Cu and Mg, these alloys can be strengthened by solid solution of alloying elements and the precipitation of second-phase particles in the microstructures, although this improvement is often at the expense of ductility [17]. For near eutectic Al-Si alloys, most studies focused on the improvement of the tensile strength employing high contents of Cu (3-5 wt.%) and Mg (0.5-0.7 wt.%) respectively in the designed alloys, but ignored ductility [3,[18][19][20][21]. Although the distribution and morphology of the hard phases, such as Mg 2 Si, Al 2 Cu and Al 5 can be well controlled via proper solidification process and heat treatment to achieve outstanding performance of ultimate tensile strength, the poor elongation of 1-3% still limits the practical applications of these alloys [22][23][24].…”

Section: Introductionmentioning

confidence: 99%

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Optimizing the tensile properties of Al–11Si–0.3Mg alloys: Role of Cu addition

Lü

et al. 2015

Journal of Alloys and Compounds

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Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Optimizing the tensile properties of Al–11Si–0.3Mg alloys: Role of Cu addition

Lü

et al. 2015

Journal of Alloys and Compounds

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“…It has been suggested that the intermetallic phases forming at the end of solidification can effectively prevent the coalescence and coarsening of dendrites. [45][46][47] The discussion in Section IV-B shows that Ce-containing inclusions can act as the nucleation sites for heterogeneous nucleation of eutectic carbides, which could lead to an increase in the nucleation of eutectic carbides, thus increasing the restriction on the dendrites coarsening.…”

Section: A Refining Mechanism Of Dendrite Structurementioning

confidence: 99%

Evolutions of Micro- and Macrostructure by Cerium Treatment in As-Cast AISI M42 High-Speed Steel

Jiao

Feng

et al. 2020

Metall Mater Trans B

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The as-cast M42 high-speed steels containing different contents of cerium (Ce) were manufactured to investigate the effects of Ce on the solidification structures at the micro-and macroscale. The results indicate that the addition of Ce could modify MgOAEAl 2 O 3 and MnS into the Ce-containing inclusions. The addition of Ce refined the dendrite structure and eutectic carbides, which can be ascribed to the heterogeneous nucleation of primary austenite on Ce 2 O 2 S or Ce 2 O 3 and the increase in both the compositional supercooling at the dendrite forefront and the restriction on the dendrites coarsening. Both the secondary dendrite arm spacing (SADS) and total eutectic carbides content decrease gradually with increasing Ce content. M 2 C and M 6 C carbides are the predominant precipitates. The increase of Ce content made the morphology of M 2 C carbides change from long lamellar or straight-rod morphology into shorter curved-rod or honeycomb morphology because of the overgrowth of eutectic austenite, but it had no significant effect on the morphology of M 6 C carbides. Ce 2 O 2 S and Ce 2 O 3 can serve as the very effective heterogeneous nucleation sites for M 6 C carbides because of the low lattice disregistry between them, hence Ce addition improved markedly the macroscopic distribution of M 6 C carbides in the cast ingot and promoted the formation of M 6 C carbides at the expense of M 2 C carbides.

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“…The presence of these phases in Al alloys directly depends on alloying elements content and manufacturing process, affecting their final mechanical properties. Among these alloys is the quaternary Al-Si-Cu-Mg system, whose microstructure is composed by eutectic Si, Q (Al 5 Mg 8 Cu 2 Si 6 ), Al 2 Cu and Mg 2 Si, in addition to other complex intermetallic compounds 1,[5][6][7][8] . These alloys have Si contents between 5.5 and 6.5 wt.% and Cu from 3.0 to 4.0%.…”

Section: Introductionmentioning

confidence: 99%