Highly Recrystallization Resistant Al-Mn-Mg Alloys Using Sc and Zr

Riddle, Yancy W.; Hallem, Håkon; Ryum, N.

doi:10.4028/www.scientific.net/msf.396-402.563

Cited by 16 publications

(12 citation statements)

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“…EDS-analysis revealed that the dispersoids contained more Sc than Zr, regardless of whether they were far away from or in the proximity of boundaries, i.e. pure Al 3 Sc or Al 3 Zr-phases were not detected despite the fact that Zr and Sc segregates to grain/dendrite centres and grain boundaries during casting, respectively [11,12]. This result is in accordance with Riddle [13] and Costello [14], who have shown by microanalysis that all the dispersoids in their Sc/Zrcontaining alloys were of the type Al 3 (Sc,Zr) regardless of their position.…”

Section: Resultsmentioning

confidence: 99%

Three dimensional atom probe investigation on the formation of Al3(Sc,Zr)-dispersoids in aluminium alloys

et al. 2004

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To cite this version:Borge Forbord, Williams Lefebvre, Frederic Danoix, Hakon Hallem, Knut Marthinsen. Three Dimensional Atom Probe investigation on the formation of Al3(Sc,Zr)-dispersoids in aluminium alloys. Scripta Metallurgica, Elsevier, 2004, 51, pp.333-337. 10 Abstract. Three Dimensional Atom-Probe (3DAP) has been applied in order to study the nucleation of small, spherical and coherent Al 3 (Sc,Zr)-dispersoids. The results indicate that Al 3 (Sc,Zr) in the beginning of the nucleation process mainly consist of Al and Sc, while Zr enters the dispersoids at a later stage, i.e relatively Zr-rich shells seem to form around Sc-rich cores.

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Section: Resultsmentioning

confidence: 99%

Three dimensional atom probe investigation on the formation of Al3(Sc,Zr)-dispersoids in aluminium alloys

et al. 2004

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“…The alloys are prone to recrystallization, however, in the interdendritic regions, where the number density of Al 3 Zr precipitates is small [20][21][22][23]. Several recent studies have aimed to minimize the extent of the precipitate-free interdendritic regions through multi-step annealing procedures [20,24,25] and other alloying additions, including Cu, Mg, Zn [21,26], Si, Fe, Mn [23,27] and Sc [22,[27][28][29][30][31][32][33] in 7xxx and other commercial wrought alloys.…”

Section: Introductionmentioning

confidence: 99%

“…There is a particularly strong interest in adding Sc to improve the precipitate distribution, thereby improving recrystallization resistance of Al-Zr alloys [22,[27][28][29][30][31][32][33][34]. Robson [31] and Forbord et al [27] have demonstrated that by combining Sc, a solute forming a terminal eutectic with Al (k 0 < 1), with Zr, a peritectic solute (k 0 > 1), the precipitate-free regions associated with a Sc-free alloy may be eliminated.…”

Section: Introductionmentioning

confidence: 99%

Ambient- and high-temperature mechanical properties of isochronally aged Al–0.06Sc, Al–0.06Zr and Al–0.06Sc–0.06Zr (at.%) alloys

2011

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Ambient-and high-temperature precipitation strengthening are investigated in Al-0.06Sc, Al-0.06Zr and Al-0.06Sc-0.06Zr (at.%) alloys. Following solidification, Sc is concentrated at the dendrite peripheries while Zr is segregated at the dendrite cores. During isochronal aging, precipitation of Al 3 Sc (L1 2 ) commences between 250 and 300°C for Al-0.06Sc, and reaches a 429 MPa peak microhardness at 325°C. For Al-0.06Zr, precipitation of Al 3 Zr (L1 2 ) first occurs between 400 and 425°C and reaches a 295 MPa peak microhardness at 475°C. A pronounced synergistic effect is observed when both Sc and Zr are present. Above 325°C, Zr additions provide a secondary strength increase that is attributed to precipitation of Zr-enriched outer shells onto the Al 3 Sc precipitates, leading to a peak microhardness of 618 MPa at 400°C for Al-0.06Sc-0.06Zr. Upon compressive creep deformation at 300-400°C, Al-0.06Sc-0.06Zr exhibits threshold stresses of 7-12 MPa; these values may be further improved by optimal heat-treatments.

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“…[12] In addition, the coarsening resistance of the Al 3 Sc dispersion and its stability against prolonged heating at high temperatures are enhanced. [13] However, there are few experimental data on the effects of combined additions of Sc and Zr in Al-Mg alloys and, more important, a thorough thermodynamic analysis of the alloy additions is missing, making the development of such alloys difficult.…”

Section: Introductionmentioning

confidence: 99%

Thermodynamics-Based Computational Design of Al-Mg-Sc-Zr Alloys

Haidemenopoulos

Katsamas

Kamoutsi

2010

Metall Mater Trans A

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Alloying additions of Sc and Zr raise the yield strength of Al-Mg alloys significantly. We have studied the effects of Sc and Zr on the grain refinement and recrystallization resistance of Al-Mg alloys with the aid of computational alloy thermodynamics. The grain refinement potential has been assessed by Scheil-Gulliver simulations of solidification paths, while the recrystallization resistance (Zener drag) has been assessed by calculation of the precipitation driving forces of the Al 3 Sc and Al 3 Zr intermetallics. Microstructural performance indices have been derived, used to rank several alloy composition variants, and finally select the variant with the best combination of grain refinement and recrystallization resistance. The method can be used, with certain limitations, for a thermodynamics-based design of Al-Mg and other alloy compositions.

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Highly Recrystallization Resistant Al-Mn-Mg Alloys Using Sc and Zr

Cited by 16 publications

References 0 publications

Three dimensional atom probe investigation on the formation of Al3(Sc,Zr)-dispersoids in aluminium alloys

Three dimensional atom probe investigation on the formation of Al3(Sc,Zr)-dispersoids in aluminium alloys

Ambient- and high-temperature mechanical properties of isochronally aged Al–0.06Sc, Al–0.06Zr and Al–0.06Sc–0.06Zr (at.%) alloys

Thermodynamics-Based Computational Design of Al-Mg-Sc-Zr Alloys

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