Coarsening behavior of Ll2 structured Al3(Zrx V1−x) precipitates in rapidly solidified AlZrV alloy

Chen, Y.C.; Fine, M. E.; Weertman, J.; Lewis, R. E.

doi:10.1016/0036-9748(87)90143-8

Cited by 55 publications

(10 citation statements)

References 9 publications

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“…Fine and coworkers showed that this lattice parameter mismatch is reduced by additions of Ti, V, or Hf~Tsunekawa & Fine, 1982;Zedalis & Fine, 1983, 1986!, resulting in improved coarsening resistance of L1 2 Al 3~Z r 1Ϫx V x !~Zedalis & Fine, 1986;Chen et al, 1987Chen et al, , 1990Lewis et al, 1987! and Al 3~Z r 1Ϫx Ti x !~Parameswaran et al, 1989!…”

Section: Introductionmentioning

confidence: 99%

Atom Probe Tomographic Studies of Precipitation in Al-0.1Zr-0.1Ti (at.%) Alloys

2007

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Atom probe tomography was utilized to measure directly the chemical compositions of Al 3~Z r 1Ϫx Ti x ! precipitates with a metastable L1 2 structure formed in Al-0.1Zr-0.1Ti~at.%! alloys upon aging at 3758C or 4258C. The alloys exhibit an inhomogeneous distribution of Al 3~Z r 1Ϫx Ti x ! precipitates, as a result of a nonuniform dendritic distribution of solute atoms after casting. At these aging temperatures, the Zr:Ti atomic ratio in the precipitates is about 10 and 5, respectively, indicating that Ti remains mainly in solid solution rather than partitioning to the Al 3~Z r 1Ϫx Ti x ! precipitates. This is interpreted as being due to the very small diffusivity of Ti in a-Al, consistent with prior studies on Al-Sc-Ti and Al-Sc-Zr alloys, where the slower diffusing Zr and Ti atoms make up a small fraction of the Al 3~S c 1Ϫx Ti x /Zr x ! precipitates. Unlike those alloys, however, the present Al-Zr-Ti alloys exhibit no interfacial segregation of Ti at the matrix/precipitate heterophase interface, a result that may be affected by a significant disparity in the evaporation fields of the a-Al matrix and Al 3~Z r 1Ϫx Ti x ! precipitates and/or a lack of local thermodynamic equilibrium at the interface.

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Section: Introductionmentioning

confidence: 99%

Atom Probe Tomographic Studies of Precipitation in Al-0.1Zr-0.1Ti (at.%) Alloys

2007

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“…It is seen in Figure 7 [6,8,9,36] although at the higher end of the range. However, additions of Si were shown to accelerate the precipitation kinetics in Zr containing alloys [39][40][41][42] and, as stated earlier, Rg measurements are partially driven by the evolution of the precipitate size distribution.…”

Section: Analysis Of Precipitate Sizesmentioning

confidence: 80%

“…In this study, unlike prior TEM investigations on similar alloys [6,8,36,37], at every ageing stage, billions of precipitates were measured using SAXS. Based on both sets of measurements, it is valuable to consider the main features of the precipitate evolution and to compare them with existing knowledge of related aluminium alloys with Zr and/or V additions.…”

Section: Discussionmentioning

confidence: 99%

“…The low diffusivity of Zr in the aluminium matrix and the low lattice misfit of the trialumininde precipitates with the matrix are the two key features promoting the good thermal stability at high temperatures [6]. A number of other low diffusivity transition elements, including Sc, Ti and V, have been proposed, which substitute for Zr in the Al3Zr phase [7], in order to further increase the resistance to coarsening.…”

Section: Introductionmentioning

confidence: 99%

“…Furthermore, when V substitutes for Zr, the lattice misfit between the precipitates and the matrix is significantly reduced [8,9]. The resulting precipitates are Al3ZrxV1-x and at temperatures below 450°C the metastable L12 crystal structure is favoured [6]. Owing to the low solubility of both Zr and V in aluminium, Al3ZrxV1-x precipitates are typically nucleated in low volume fractions and are typically nonuniformly (inhomogenously) distributed due to microsegregation of Zr and V during solidification of the alloy.…”

Section: Introductionmentioning

confidence: 99%

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Characterising precipitate evolution in multi-component cast aluminium alloys using small-angle X-ray scattering

Wang

McCartney

et al. 2017

Journal of Alloys and Compounds

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The version presented here may differ from the published version or from the version of record. If you wish to cite this item you are advised to consult the publisher's version. Please see the repository url above for details on accessing the published version and note that access may require a subscription. AbstractAluminium alloys can be strengthened significantly by nano-scale precipitates that restrict dislocation movement. In this study, the evolution of inhomogenously distributed trialuminide precipitates in two multi-component alloys was characterised by synchrotron small-angle Xray scattering (SAXS). The appropriate selection of reference sample and data treatment required to successfully characterise a low volume fraction of precipitates in multi-component alloys via SAXS was investigated. The resulting SAXS study allowed the analysis of statistically significant numbers of precipitates (billions) as compared to electron microscopy (hundreds). Two cast aluminium alloys with different volume fractions of Al3ZrxV1-x precipitates were studied. Data analysis was conducted using direct evaluation methods on SAXS spectra and the results compared with those from transmission electron microscopy (TEM). Precipitates were found to attain a spherical structure with homogeneous chemical composition. Precipitate evolution was quantified, including size, size distribution, volume fraction and number density. The results provide evidence that these multi-component alloys have a short nucleation stage, with coarsening dominating precipitate size. The coarsening rate constant was calculated and compared to similar precipitate behaviour.2

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The Effect of Transition Elements on High‐Temperature Mechanical Properties of Al–Si Foundry Alloys–A Review

2016

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The high temperature mechanical performance of Al-Si alloys can be enhanced by alloying with transition metals, induced by the formation of thermally stable and coarsening resistant precipitates in the microstructure. However, the binary dispersoids such as Al 3 Zr can be less effective due to limitations encountered during conventional manufacturing processes. Further improvements can be achieved through the transformation of these binary trialuminides into ternary or quaternary forms by alloying with appropriate elements. The role of transition elements in improving high temperature mechanical properties of Al-Si alloys from both theoretical and practical viewpoints is critically reviewed.

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Coarsening behavior of Ll2 structured Al3(Zrx V1−x) precipitates in rapidly solidified AlZrV alloy

Cited by 55 publications

References 9 publications

Atom Probe Tomographic Studies of Precipitation in Al-0.1Zr-0.1Ti (at.%) Alloys

Atom Probe Tomographic Studies of Precipitation in Al-0.1Zr-0.1Ti (at.%) Alloys

Characterising precipitate evolution in multi-component cast aluminium alloys using small-angle X-ray scattering

The Effect of Transition Elements on High‐Temperature Mechanical Properties of Al–Si Foundry Alloys–A Review

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