Effect of Er additions on ambient and high-temperature strength of precipitation-strengthened Al–Zr–Sc–Si alloys

Booth-Morrison, Christopher; Seidman, David N.; Dunand, David C.

doi:10.1016/j.actamat.2012.02.030

Cited by 156 publications

(39 citation statements)

References 58 publications

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“…Furthermore, an important impurity effect has been reported in [4][5][6]. The presence of such types of the impurities (i.e.…”

Section: Introductionmentioning

confidence: 99%

Impurity effects on the solidification of primary Al₃(Sc,Zr) phase in Al alloys

Schumacher

2016

IOP Conf. Ser.: Mater. Sci. Eng.

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Abstract. The nucleation and growth of primary Al 3 Sc phase has been investigated in high purity Al alloys and commercial purity Al alloys, with a special focus on the impurity effects. In the case of high purity Al alloys, most primary Al 3 Sc phases were pushed to grain boundaries during moving solidification front. Such type of primary Al 3 Sc phase does not contribute to the heterogeneous nucleation and thereby no significant grain refinement of Al alloys was observed, although some Al 3 Sc particles remain the same orientation with the Al matrix. In the case of commercial purity Al alloy, the presence of impurities, e.g. Ti, Fe and Si, enhances the heterogeneous nucleation of primary Al 3 Sc phase. Most primary Al 3 Sc phases are located within the Al matrix, and keep the same orientation with the Al matrix. Furthermore, the presence of impurities also changes the growth mode of primary Al 3 Sc phase. In the case of commercial purity Al alloy, a layer by layer growth was observed. This investigation demonstrates that impurities have important effects on the nucleation and growth of primary Al 3 Sc phases in Al based alloys.

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“…Furthermore, an important impurity effect has been reported in [4][5][6]. The presence of such types of the impurities (i.e.…”

Section: Introductionmentioning

confidence: 99%

Impurity effects on the solidification of primary Al₃(Sc,Zr) phase in Al alloys

Schumacher

2016

IOP Conf. Ser.: Mater. Sci. Eng.

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“…The promising results are related to the formation of a dense and homogeneous distribution of the L1 2 -structured Al 3 (Sc,Zr) precipitates. [2][3][4][5][6][7][9][10][11] The complex nanostructure of the Al 3 (Sc,Zr) phase in aluminum has been discussed in several recent articles by studies using conventional and high-resolution transmission electron microscopy (TEM). [12,13] Atom-probe tomography (APT) was also employed to measure Sc,Zr concentration and distribution.…”

Section: Introductionmentioning

confidence: 99%

Early Stages of Precipitation Process in Al-(Mn-)Sc-Zr Alloy Characterized by Positron Annihilation

Vlach

Čı́žek

Melikhova

et al. 2015

Metall Mater Trans A

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Thermal effects on the precipitation stages in as-cast Al-0.70 at. pct Mn-0.15 at. pct Sc-0.05 at. pct Zr alloy were studied. The role of lattice defects was elucidated by positron annihilation spectroscopy (lifetime and coincidence Doppler broadening) enabling investigation of solutes clustering at the atomic scale. This technique has never been used in the Al-Sc-and/or Al-Zr-based alloys so far. Studies by positron annihilation were combined with resistometry, hardness measurements, and microstructure observations. Positrons trapped at defects are preferentially annihilated by Sc electrons. Lifetime of trapped positrons indicates that Sc atoms segregate at dislocations. Maximum fraction of positrons annihilated by Sc electrons occurring at 453 K (180°C) suggests that clustering of Sc bound with vacancies takes place. It is followed by peak of this fraction at 573 K (300°C). A rise of the contribution of trapped positrons annihilated by Zr electrons starting at 513 K (240°C) and attaining maximum also at 573 K (300°C) confirms that Zr participates in precipitation of the Al 3 Sc particles already at these temperatures. The pronounced hardening at 573 K (300°C) has its nature in the precipitation of the Al 3 Sc particles with a Zr-rich shell. The contribution of trapped positrons annihilated by Mn electrons was found to be negligible.

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“…Knipling et al [14] found that these nanoparticles start to precipitate between 350 and 375 °C, achieving a peak microhardness of 420 MPa at 425-450 °C. Small additions of other elements, particularly rare earth such as erbium [21,23,28,29] and ytterbium [22,24,27], do not significantly affect the strengthening The annealing process is a key which determined the objectives set out in the present paper: a) to produce hot-rolled sheets of aluminum alloys containing up to 0.5 wt% Zr under conditions approaching those typical of commercial CCR machines and b) to study the influence of annealing temperature (up to 650 °C) on the electrical conductivity, hardness and phase composition of these alloys, in particular on the concentration of Zr in (Al) and the quantity of L1 2 (Al 3 Zr) nanoparticles.…”

Section: Introductionmentioning

confidence: 99%

“…Optimization of the process parameters is a difficult task that is caused by the complexity of CCR process (Fig.1) which significantly differs from conventional processing routes when casting of billets and subsequent deformation are separated in time and space.Positive influence of zirconium on hardness (as a measure of thermal stability) is caused by nanoparticles of the L1 2 (Al 3 Zr) phase formed in a wire rod upon decomposition of a supersaturated aluminum solid solution (further (Al)) during annealing process [14][15][16][17][18][19][20][21][22][23][24][25][26][27][28][29]. Knipling et al [14] found that these nanoparticles start to precipitate between 350 and 375 °C, achieving a peak microhardness of 420 MPa at 425-450 °C.…”

Section: Introductionmentioning

confidence: 99%

Effect of Zr additions and annealing temperature on electrical conductivity and hardness of hot rolled Al sheets

Белов

Alabin

Матвеева

et al. 2015

Transactions of Nonferrous Metals Society of China

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Abstract. Influence of annealing cycles up to 650 °C on the specific conductivity (Ω) and hardness (HV) of hot-rolled sheets of aluminum alloys containing up to 0.5 wt% Zr was studied. By using analytical calculations of phase composition and experimental methods (SEM, TEM, EMPA, etc.) it is demonstrated that the conductivity depends first of all on the concentration of zirconium in the aluminum solid solution which is minimum after 3-h holding at 450 °C. On the other hand, the hardness of the alloy is mainly caused by the amount of nanoparticles of the L1 2 (Al 3 Zr) phase that defines the retention of strain hardening. It is shown that the best combination of Ω and HV values can be reached within an acceptable holding time at the temperature about 450 °C. *corresponding author: nikolay-belov@yandex.ru, +7 495 9511928

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Effect of Er additions on ambient and high-temperature strength of precipitation-strengthened Al–Zr–Sc–Si alloys

Cited by 156 publications

References 58 publications

Impurity effects on the solidification of primary Al₃(Sc,Zr) phase in Al alloys

Impurity effects on the solidification of primary Al₃(Sc,Zr) phase in Al alloys

Early Stages of Precipitation Process in Al-(Mn-)Sc-Zr Alloy Characterized by Positron Annihilation

Effect of Zr additions and annealing temperature on electrical conductivity and hardness of hot rolled Al sheets

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Effect of Er additions on ambient and high-temperature strength of precipitation-strengthened Al–Zr–Sc–Si alloys

Cited by 156 publications

References 58 publications

Impurity effects on the solidification of primary Al3(Sc,Zr) phase in Al alloys

Impurity effects on the solidification of primary Al3(Sc,Zr) phase in Al alloys

Early Stages of Precipitation Process in Al-(Mn-)Sc-Zr Alloy Characterized by Positron Annihilation

Effect of Zr additions and annealing temperature on electrical conductivity and hardness of hot rolled Al sheets

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Impurity effects on the solidification of primary Al₃(Sc,Zr) phase in Al alloys

Impurity effects on the solidification of primary Al₃(Sc,Zr) phase in Al alloys