Characterization of phase development in non-isothermally annealed mould-cast and heat-treated Al–Mn–Sc–Zr alloys

Vlach, Martin; Stulı́ková, Ivana; Smola, Bohumil; Žaludová, N.

doi:10.1016/j.matchar.2010.10.006

Cited by 27 publications

(31 citation statements)

References 18 publications

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“…Negative numerical derivatives of the measured resistivity annealing curves. data compiled in the previous studies of the mould-cast and cold-rolled AlScZr alloys [9] as well as the mould--cast AlMnScZr-based alloys [15] do not dier in the temperature position of this stage from spectra in Fig. 3.…”

Section: Resultsmentioning

confidence: 66%

“…3. This stage was ascribed to the precipitation of the Al 3 Sc particles [9,15]. Thus the observed undistinguished resistivity decrease and corresponding I-stage in the annealing spectra in Fig.…”

Section: Resultsmentioning

confidence: 74%

“…in Refs. [9,10,15,20]). First, Zr segregates at the heterophase interface of the Al 3 Sc particles, afterwards the development of these particles with the L1 2 structure leads to the formation of the Al 3 (Sc,Zr) phase.…”

Section: Resultsmentioning

confidence: 99%

“…The easier diusion of Mn atoms along the (sub)grain boundaries is responsible for the precipitation of the Al6Mn and/or Al6(Mn,Fe) particles at relatively lower temperatures compared to the temperature range of precipitation of these particles in the classical mould-cast AlMnScZr alloys The apparent activation energy for precipitation of the Al3Sc and Al6Mn particles in the AlMnScZr alloy was determined as (106 ± 10) Properties and microstructure of Al and its alloys are signicantly inuenced by a small addition of scandium (≈ 0.2 wt%) and zirconium (≈ 0.1 wt%) [18]. Positive eects on microhardness, recrystallization temperature, corrosion resistance and weldability attained due to the coherent spherical nanosized Al 3 (Sc,Zr) particles with the cubic L1 2 structure are very pronounced [15,8]. The decomposition sequence of the supersaturated solid solution of the AlScZr-based system is known in the following form [5,9,10]: Sc-rich clusters → Al 3 Sc phase → layer rich in Zr → Al 3 (Sc,Zr) phase.…”

mentioning

confidence: 99%

“…The precipitation of Mn-containing particles in Al inuences the resistivity signicantly [8]. However, it has a poor eect on microhardness [1,14,15]. It was also recently observed that the ne-grained structure of the Al-based alloys helps to accelerate the precipitation of Mn-containing particles and the recrystallization process [12,14,16].…”

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confidence: 99%

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Microstructure, Thermal and Mechanical Properties of Non-Isothermally Annealed Al-Sc-Zr and Al-Mn-Sc-Zr Alloys Prepared by Powder Metallurgy

et al. 2012

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This paper reports results of a study aimed at understanding the precipitation processes occurring during the annealing of two AlScZr-based alloys with and without Mn prepared by powder metallurgy with subsequent hot extrusion at 350• C. Samples were isochronally annealed up to ≈ 570 • C. Precipitation behaviour was studied by electrical resistometry and dierential scanning calorimetry. Mechanical properties were monitored by microhardness HV1 measurements. Transmission electron microscopy examinations and X-ray diraction of specimens quenched from temperatures of signicant resistivity changes helped to identify the microstructural processes responsible for these changes. Fine (sub)grain structure develops and ne coherent Al3Sc and/or Al3(Sc,Zr) particles precipitate during extrusion in both alloys. The distinct changes in resistivity (at temperatures above ≈ 330• C) of the AlMnScZr alloy are mainly caused by precipitation of Mn-containing particles. The easier diusion of Mn atoms along the (sub)grain boundaries is responsible for the precipitation of the Al6Mn and/or Al6(Mn,Fe) particles at relatively lower temperatures compared to the temperature range of precipitation of these particles in the classical mould-cast AlMnScZr alloys The apparent activation energy for precipitation of the Al3Sc and Al6Mn particles in the AlMnScZr alloy was determined as (106 ± 10) kJ mol −1 and (152 ± 33) kJ mol −1 , respectively.

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Section: Resultsmentioning

confidence: 66%

Section: Resultsmentioning

confidence: 74%

Section: Resultsmentioning

confidence: 99%

mentioning

confidence: 99%

mentioning

confidence: 99%

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Microstructure, Thermal and Mechanical Properties of Non-Isothermally Annealed Al-Sc-Zr and Al-Mn-Sc-Zr Alloys Prepared by Powder Metallurgy

et al. 2012

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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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The Effect of Alloying Elements on the Microstructure of Al-5Fe Alloys

Liu

Yuan

Huang

et al. 2012

JOM

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Characterization of phase development in non-isothermally annealed mould-cast and heat-treated Al–Mn–Sc–Zr alloys

Cited by 27 publications

References 18 publications

Microstructure, Thermal and Mechanical Properties of Non-Isothermally Annealed Al-Sc-Zr and Al-Mn-Sc-Zr Alloys Prepared by Powder Metallurgy

Microstructure, Thermal and Mechanical Properties of Non-Isothermally Annealed Al-Sc-Zr and Al-Mn-Sc-Zr Alloys Prepared by Powder Metallurgy

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

The Effect of Alloying Elements on the Microstructure of Al-5Fe Alloys

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