Precipitation and recrystallisation in Al–Mn–Zr with and without Sc

Forbord, Børge; Hallem, Håkon; Ryum, N.; Marthinsen, Knut

doi:10.1016/j.msea.2003.10.374

Cited by 59 publications

(23 citation statements)

References 2 publications

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“…During solutionizing, which is typically performed at $500°C coherent Al 3 Zr (L1 2 ) precipitates are formed, which inhibit subsequent recrystallization by pinning migrating grain boundaries, thus maintaining grain boundary strengthening. 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%

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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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Section: Introductionmentioning

confidence: 99%

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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“…It has been found that addition of 0.32%wt Zr decomposes in solid solution and also forms their precipitate Al 3 Zr in nanosize during ageing process. These precipitates get a key role in the microstructural features of the wire material through the increasing recrystallization resistance [10,11]. Distribution of Al 3 Zr precipitates can be seen in Fig.…”

Section: Resultsmentioning

confidence: 96%

Manufacturing of Al-Zr Thermal-resistant Alloys for Transmission Lines

2015

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The present transmission lines of populous cities will have to be changed with an ability to work at higher temperatures without any weight and cross section changes. Innovative thermal-resistant alloy conductors (T-ACSR) operate in the range of about 150200• C instead of 75 • C which is the standard ACSR type conductor service temperature. In this study, the manufacturing procedure of Al-Zr alloy wire, used as high-temperature conductor wires, have been introduced. The Al-Zr alloy has been cast in a permanent mold than being extruded to a diameter of 10 mm at 400• C. After that the extruded rods have been cold drawn to a diameter of 3.02 mm. Elongation and tensile strength values of the cold drawn wire have been achieved by tensile test at elevated temperatures. Also, microstructural analysis and dispersion hardening procedure have been investigated. The results show that tensile strength and thermal-resistant property are improved by the addition of Zr.

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“…The beneficial effects of Sc addition on the precipitation and recrystallisation behaviour, 13,14) age hardening, 15) creep and yielding behaviour, 16) fatigue performance, 17) and high strain rate deformation response [18][19][20][21] of high strength Al alloys have attracted significant attention in the literature. However, the adiabatic shearing behaviour of Al-Sc alloys is still relatively unclear.…”

Section: Introductionmentioning

confidence: 99%

Adiabatic Shearing Localisation in High Strain Rate Deformation of Al-Sc Alloy

et al. 2010

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Aluminium-scandium (Al-Sc) alloy is subjected to shear deformation at high strain rates ranging from 3:0 Â 10 5 s À1 to 6:2 Â 10 5 s À1 using a compressive-type split-Hopkinson pressure bar (SHPB). The effects of the strain rate on the shear stress, adiabatic shear band characteristics, and fracture features of the Al-Sc alloy are systematically examined. The results show that both the shear stress and the strain rate sensitivity increase with an increasing strain rate. In addition, it is shown that an adiabatic shear band is formed within the deformed specimens for all values of the strain rate. As the strain rate is increased, the width of the shear band decreases, but the microhardness increases. Moreover, the distortion angle and the magnitude of the local shear strain near the shear band both increase with an increasing strain rate. At a strain rate of 3:0 Â 10 5 s À1 , the fracture surface is characterised by multiple transgranular clearage fractures. However, for strain rates greater than 4:4 Â 10 5 s À1 , the fracture surface has a transgranular dimple-like characteristic, and thus it is inferred that the ductility of the Al-Sc alloy improves with an increasing strain rate.

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Precipitation and recrystallisation in Al–Mn–Zr with and without Sc

Cited by 59 publications

References 2 publications

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

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

Manufacturing of Al-Zr Thermal-resistant Alloys for Transmission Lines

Adiabatic Shearing Localisation in High Strain Rate Deformation of Al-Sc Alloy

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