Effect of Sc and Zr Additions on Microstructure and Mechanical Properties of Conventional Cast and P/M Aluminium

Kolar, Michal; Očenášek, Vladivoj; Uhlíř, Jaromír; Stulı́ková, Ivana; Smola, Bohumil; Vlach, Martin; Neubert, Volkmar; Šperlink, K.

doi:10.4028/www.scientific.net/msf.567-568.357

Cited by 10 publications

(9 citation statements)

References 3 publications

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“…One can conclude that this result is probably connected with the Sc,Zr-addition. The hardening effect at this temperature range is typical for the Al-Sc-Zr-based alloys [1,[11][12][13]18]. However, the existence of the Al 3 (Sc,Zr)-phase particles was not observed directly (by TEM) as the consequence of the small amount of these additions in the matrix and/or their inhomogeneous distribution such as randomly localized matrix regions with the higher Sc,Zr-content.…”

Section: Phase Development In the MC Alloys During Isochronal Annealingmentioning

confidence: 90%

“…An addition of Sc (∼ 0.15 at.%) and Zr (∼ 0.1 at.%) to Al-based alloys is made to refine the cast grain structure, to increase recrystallization temperature and to improve mechanical properties [1,11]. A large improvement of Al due to Sc,Zr-addition has been frequently reported to be the formation of nanoscale, coherent Al 3 (Sc,Zr)-phase precipitates (L1 2 structure) [11][12][13]. It predetermines the Al-Sc-Zr-based alloys for high-temperature automotive and aerospace applications [11].…”

Section: Introductionmentioning

confidence: 99%

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Characterization of phase development in commercial Al-Zn-Mg(-Mn,Fe) alloy with and without Sc,Zr-addition

Vlach¹,

Kodetová²,

Smola³

et al. 2018

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Precipitation reactions of the Al-Zn-Mg(-Mn,Fe)-based alloys with/without Sc,Zr-addition were studied by microhardness and resistivity measurements, and differential scanning calorimetry. Microstructure observation proved the Zn,Mg-containing eutectic phase at grain boundaries. Positron spectroscopy confirmed the presence of Guinier-Preston (GP) zones in the initial state. The changes in resistivity and microhardness curves as well as in heat flow are mainly caused by the formation and/or dissolution of the Guinier-Preston zones and precipitation of the particles from the Al-Zn-Mg system. Formation of the Mn,Fe-containing particles as well as of the η-and T-phase does not influence hardening significantly. The hardening effect above ∼ 300 • C reflects the Sc,Zr-addition. Heat treatment at 300 • C for 60 min and 460 • C for 45 min is insufficient for homogenization of the alloys. The apparent activation energy values were calculated: dissolution of the GP zones (∼ 106 kJ mol −1), formation of the metastable η-phase (∼ 111 kJ mol −1), formation of the stable η-phase (∼ 126 kJ mol −1

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Section: Phase Development In the MC Alloys During Isochronal Annealingmentioning

confidence: 90%

Section: Introductionmentioning

confidence: 99%

Characterization of phase development in commercial Al-Zn-Mg(-Mn,Fe) alloy with and without Sc,Zr-addition

Vlach¹,

Kodetová²,

Smola³

et al. 2018

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“…• C was observed in the AlSc-based alloys prepared by powder metallurgy where Sc-containing particles also precipitated during hot extrusion [7].…”

Section: Resultsmentioning

confidence: 99%

“…AlSc alloys [17], AlScZr alloys [3,7,18] or AlMn--based alloys with Ni and Cr [19]. Powder metallurgical production of Sc and Zr containing Al alloys can add other improvements connected with substantial grain renement, e.g.…”

mentioning

confidence: 99%

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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“…Refs. [2,4,[21][22][23]. The effect of the Mn-, Sc-and Zr-content on recrystallization in binary aluminium alloys has now been partially documented [7,17,[24][25][26].…”

Section: Introductionmentioning

confidence: 99%

Annealing effects in hot-deformed Al-Mn-Sc-Zr alloys

Vlach¹,

Stulı́ková²,

Smola³

et al. 2021

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Microstructure, thermal, electrical and mechanical properties of the hot-extruded and hotrolled AlMnScZr alloys were studied. The electrical resistometry and microhardness together with differential scanning calorimetry measurements were compared with microstructure development observed by transmission electron microscopy, X-ray diffraction, and electron backscatter diffraction. Fine subgrain or grain structure developed and fine coherent Al3(Sc,Zr) particles precipitated during hot deformation and subsequent cooling. The distinct resistivity changes are mainly caused by precipitation of Mn-containing particles. The pronounced two-stage development of the Al6(Mn,Fe)-phase precipitation was observed. Nevertheless, the precipitation has a negligible effect on microhardness. The presence of the Mn-containing particles with a size of ∼ 50 nm inside subgrains or grains and ∼ 2 µm at subgrain or grain boundaries has a significant antirecrystallization effect. The combination of Mn, Sc and Zr additions to Al suppresses recrystallization during isothermal annealing at 550• C. Hot deformation has no effect on the apparent activation energy values of the Al3Sc-phase precipitation (Q = 109 kJ mol −1 ) and Al6Mn-phase precipitation (Q = 156 kJ mol −1 ).K e y w o r d s: Al3Sc phase, hot extrusion, hot rolling, activation energy, EBSD, DSC

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Effect of Sc and Zr Additions on Microstructure and Mechanical Properties of Conventional Cast and P/M Aluminium

Cited by 10 publications

References 3 publications

Characterization of phase development in commercial Al-Zn-Mg(-Mn,Fe) alloy with and without Sc,Zr-addition

Characterization of phase development in commercial Al-Zn-Mg(-Mn,Fe) alloy with and without Sc,Zr-addition

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

Annealing effects in hot-deformed Al-Mn-Sc-Zr alloys

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