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

D’Souza, N.; Feitosa, L. M.; West, Geoff; Jones, Nicholas Blurton; Dong, Hongbiao

doi:10.1016/j.jallcom.2016.12.149

Cited by 9 publications

(5 citation statements)

References 20 publications

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“…The occurrence of invariant quasi-peritectic reaction depends on the solidification path. The similar phenomenon was also observed in other ternary alloy systems, such as Ta-Al-Fe [5] , Pb-Sn-Sb [14] and Nb-Al-Co [7] , et al…”

Section: Discussionsupporting

confidence: 83%

Solidification sequence and as-cast microstructure of a model Pb-Bi-Sn alloy with quasi-peritectic reaction

et al. 2019

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I n the past few decades, the solidification behavior of binary alloys with dendritic, eutectic or peritectic reactions has been widely investigated. However, the alloys for industrial application are multicomponent alloys. The quasi-peritectic reaction, which was defined as: L+α→β+γ, where L indicates the liquid phase, and α, β, and γ indicate the solid phases, are usually observed during solidification of multicomponent alloys. For example, G. Sha et al. [1] investigated the as-cast microstructure of Al-Si-Fe alloys, and found two quasiperitectic reactions: L+Al 13 Fe 4 →α-AlFeSi+α-Al and L+α-AlFeSi→β-AlFeSi+α-Al. Additionally, the quasiperitectic reaction was also observed during solidification of solder alloys, such as Cu-Ni-Sn [2] , Pb-Bi-Sn [3] and Cu-Sn-Zn [4]. Recently, refractory alloys, such as Ta-Al-Fe [5, 6] and Nb-Al-Co [7] , which were treated as the potential high-temperature structural materials, also exhibit quasi-peritectic reaction. The solidification behavior of ternary alloys are much more complicated than the counterpart of binary alloys. Particularly, the solidification parameters, such as thermal gradient and cooling rate, have strong effects on the morphology, size,

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Section: Discussionsupporting

confidence: 83%

Solidification sequence and as-cast microstructure of a model Pb-Bi-Sn alloy with quasi-peritectic reaction

et al. 2019

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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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“…The relationships of liquid fraction-temperature were calculated through DSC and SPSC and are compared Fig. 11 Comparison of liquid fraction as a function of temperature of 690 mg Al-11.68mass% Si alloy for DSC and new SPSC for 3.1 K min -1 cooling and heating rate, together with prediction curve [17][18][19][20]. It can be seen that all heating curves from DSC are lying on the right-hand side of the Scheil curve, while all the cooling curves of DSC are lying on the left-hand side of the Scheil curve since heating is endothermic process and cooling is exothermic process.…”

Section: Results For Al-1168mass%si Alloymentioning

confidence: 99%

Determination of solid/liquid fraction of three aluminium binary alloys using a new single-pan scanning calorimeter

Savas

Dong

2017

J Therm Anal Calorim

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There is an increased demand for data with higher precision for the enthalpy changes and the fraction of solid/liquid temperatures of materials. Therefore, continuous efforts are often devoted to design calorimeters that can accurately measure materials' thermophysical properties. In this study, a new single-pan scanning calorimeter was used to measure the transition temperature and enthalpy change of three aluminium binary alloys. Measured results also were compared with the calculated results using thermodynamic software. The measured high accuracy enthalpy data were used to determine transient temperature. It is concluded that the new instrument is a promising device that can achieve reliable and reproducible materials' thermophysical data.

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

Cited by 9 publications

References 20 publications

Solidification sequence and as-cast microstructure of a model Pb-Bi-Sn alloy with quasi-peritectic reaction

Solidification sequence and as-cast microstructure of a model Pb-Bi-Sn alloy with quasi-peritectic reaction

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

Determination of solid/liquid fraction of three aluminium binary alloys using a new single-pan scanning calorimeter

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