Microsegregation in Al-Cu alloys

Kurum, E. C.; Dong, Hongbiao; Hunt, J. D.

doi:10.1007/s11661-005-0082-7

Cited by 32 publications

(14 citation statements)

References 16 publications

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“…Therefore, it is important to understand the solidification sequence in these alloys, which in turn will dictate the heat treatment required thereafter to obtain the desired microstructure. Under normal conditions of solidification even though diffusion in the solid is limited, it is still appropriate to assume that equilibrium conditions exist at the solid/liquid interface [15].…”

Section: Introductionmentioning

confidence: 99%

Effects of solute trapping on solidification path in Ta-rich Ta-Al-Fe ternary alloys under rapid freezing

D’Souza

Feitosa

West

et al. 2017

Journal of Alloys and Compounds

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The solidification sequence of Ta-rich Ta-Al-Fe alloys was examined under rapid freezing processes, arc melting and splat cooling techniques. It is found that loss of interfacial equilibrium results in an extended solubility of Al (up to 15 at. %) and a lower Fe content in primarily Ta phase (A2) in arc melted samples. Trapping of Al in the primary phase leads to a deviation of the solidification path from equilibrium prediction. When Al content is less than 10 at. % Al and Fe content is less than 4 at. % in the primary phase, the peritectic reaction, L + A2 → σ, is suppressed and instead the eutectic reaction, L → A2 + µ takes place following primary freezing. It is also found that under splat cooling conditions extended solute solubility occurs in µ phase formed via a eutectic reaction.

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Section: Introductionmentioning

confidence: 99%

Effects of solute trapping on solidification path in Ta-rich Ta-Al-Fe ternary alloys under rapid freezing

D’Souza

Feitosa

West

et al. 2017

Journal of Alloys and Compounds

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“…Also, in some cases, suppression of the Class II invariant reaction, L + r fi A2 + l, might occur. [28,29] Likewise, in the Pb-Sn-Sb system during rapid cooling following nucleation and growth of primary Sb, the liquid composition approaches the Sb-Pb eutectic valley instead of the Sb-Sn eutectic valley, resulting in the (L fi Sb + Pb) eutectic reaction instead of the (L fi Sb + SbSn) eutectic reaction. [30] Both (1) and (2) will then have an important role in the subsequent invariant reactions, if these do occur, and on the subsequent three-phase reactions that result, when not all the liquid has been consumed.…”

Section: Introductionmentioning

confidence: 99%

Solidification Reaction Sequence of Co-Rich Nb-Al-Co Alloys

Feitosa

D’Souza

West

et al. 2017

Metall Mater Trans A

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The freezing reaction sequence of Co-rich Nb-Al-Co ternary alloys with emphasis on the formation of Laves and Heusler phases has been examined. For Co-rich alloys, the solidification reaction sequence is observed as primary freezing of a-Co and CoAl phases, subsequent [Co + C36] and [CoAl + C36] eutectics, and the final ternary eutectic reaction [L fi a-Co + C36 + CoAl]. The compositions of solidified a-Co and C36 phases agree with the corresponding vertices of the tie-triangle at the solidus temperatures. When the Nb concentration is over 20 at. pct in Co-rich alloys, the quasi-peritectic reaction [L + Co 2 AlNb fi C36 + CoAl] does not occur as equilibrium prediction. The formation of C36 and CoAl phases occurs through solid precipitation and must be distinguished from a solidification reaction.

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“…It was stated previously [6,7,10] that sorting schemes based on a single selected solute with monotonously ascending or descending content may not describe the correct phase sequence during solidification. In this work, the leadingelement sort (Al) is also found to be incapable of revealing the primary precipitation of the Al 8 Mn 5 phase characteristic of the solidification of the AM50 alloy.…”

Section: B Issues Regarding Quantitative Epma Mappingmentioning

confidence: 99%

“…Numerous studies involving the X-ray mapping of directionally solidified samples and data processing are found in the literature; most deal with steel, [6,8] aluminum alloys, [1,9,10] or superalloys, [7,11] but a few are found that deal with magnesium alloys. Zhang et al [12] recently combined directional solidification (DS), EPMA, and the Scheil-solidification model to study the morphology and microsegregation of a binary Mg-4 wt pct Al alloy.…”

Section: Introductionmentioning

confidence: 99%

Directional Solidification of Mg-Al Alloys and Microsegregation Study of Mg Alloys AZ31 and AM50: Part I. Methodology

Mirković

Schmid–Fetzer

2009

Metall Mater Trans A

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An appropriate method for the directional solidification (DS) of magnesium alloys AZ31 and AM50 was developed to enable the investigation of microstructures and microsegregation under controlled solidification conditions. These liquid alloys, containing both magnesium and aluminum, are highly reactive and attack both standard ceramic and metallic container materials. An integrated approach is developed that is comprised of the dedicated boron nitride (BN) protection of selected steel tube material and limitation of the melt temperature, with the retention of sufficiently high thermal gradients for DS. The well-known Scheil method for the thermodynamic calculation of segregation is extended to reflect the solute profiles of components in all precipitating phases. This ''Scheil-total'' profile is more realistic; its integral reflects the bulk composition of a multiphase alloy. It also predicts the primary crystallizing Al-Mn intermetallic phase experimentally detected in the microstructure. This prediction is also confirmed by the application of an advanced processing of quantitative electron probe microanalysis (EPMA) mapping data.

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Microsegregation in Al-Cu alloys

Cited by 32 publications

References 16 publications

Effects of solute trapping on solidification path in Ta-rich Ta-Al-Fe ternary alloys under rapid freezing

Effects of solute trapping on solidification path in Ta-rich Ta-Al-Fe ternary alloys under rapid freezing

Solidification Reaction Sequence of Co-Rich Nb-Al-Co Alloys

Directional Solidification of Mg-Al Alloys and Microsegregation Study of Mg Alloys AZ31 and AM50: Part I. Methodology

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