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

Vlach, Martin; Stulı́ková, Ivana; Smola, Bohumil; Kekule, Tomáš; Kudrnová, Hana; Kodetová, Veronika; Očenášek, Vladivoj; Málek, Jaroslav; Neubert, Volkmar

doi:10.4149/km_2015_5_295

Cited by 13 publications

(29 citation statements)

References 36 publications

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“…In particular, this resistance in the CR400 state of the 1.5MnCuZr alloy was almost two times than that of the 1.5Mn binary alloy. The higher heat resistance of this alloy was accounted for by the presence of dispersoids, which prevent recrystallization [32][33][34]. In particular, dark field TEM Figure 3a shows the presence of a high fraction of nanoscale dispersoids, which, in agreement with the obtained SADP (selected area diffraction pattern), corresponded to the Al 3 Zr phase with L1 2 structural type having a characteristic cube-on-cube orientation relationship with the matrix.…”

Section: Hardness and Electrical Conductivity Analysissupporting

confidence: 73%

Simultaneous Increase of Electrical Conductivity and Hardness of Al–1.5 wt.% Mn Alloy by Addition of 1.5 wt.% Cu and 0.5 wt.% Zr

Белов

Короткова

Akopyan

et al. 2019

Metals

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The effect of Cu and Zr additions and annealing temperature on electrical conductivity and hardness of the Al–1.5 wt.% Mn alloy in the form of as-cast ingots and cold rolled sheets has been investigated. It is shown that due to the formation of low alloyed aluminum solid solution and Al20Cu2Mn3 and Al3Zr (L12) phase nanoparticles, the 1.5MnCuZr alloy is superior to the base 1.5Mn alloy both in the hardness (up to two times) and electrical conductivity (up to 30%) after metal processing and annealing. A new alloy can be considered as a replacement for existing 6201 type conductive alloys.

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Section: Hardness and Electrical Conductivity Analysissupporting

confidence: 73%

Simultaneous Increase of Electrical Conductivity and Hardness of Al–1.5 wt.% Mn Alloy by Addition of 1.5 wt.% Cu and 0.5 wt.% Zr

Белов

Короткова

Akopyan

et al. 2019

Metals

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“…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%

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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“…The annealing procedure was performed exactly in the same way as described in Refs. [10,11]. The thermal behaviour of the alloys was studied using differential scanning calorimetry (DSC) performed using the heating rate of 20 K/min in the Netzsch 200 F3 Maia apparatus.…”

Section: Methodsmentioning

confidence: 99%

“…An addition of Sc (≈ 0.2 wt%) and Zr (≈ 0.1 wt%) to Al-based alloys is used to refine the cast grain structure, to increase recrystallization temperature, and to improve their mechanical properties [9,10]. Consequently, there is an interest in a further improvement of properties of Al-Zn-Mg-Cu-based alloys containing Sc and Zr and a study of their microstructure and mechanical properties [9].…”

Section: Introductionmentioning

confidence: 99%

“…Consequently, there is an interest in a further improvement of properties of Al-Zn-Mg-Cu-based alloys containing Sc and Zr and a study of their microstructure and mechanical properties [9]. Despite the fact that the AA7xxx series alloys belong to the most extensively used Al-based * corresponding author; e-mail: veronika.kodetova@seznam.cz alloys [4,5,9,10], relatively few studies have investigated phase transformations of the Al-Zn-Mg-Cu-based alloys with Sc,Zr-addition. A tailoring of the material with required properties is very difficult without a detailed knowledge of the precipitation processes and the role of Sc and Zr in the microstructure development.…”

Section: Introductionmentioning

confidence: 99%

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Early Stages of Precipitation in Mould-Cast, Cold-Rolled and Heat-Treated Aluminium Alloy AA7075 with Sc,Zr-Addition

et al. 2020

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Precipitation reactions of the commercial Al-Zn-Mg-Cu(-Sc-Zr) alloy in mould-cast, cold-rolled, and heattreated states were characterized by electron microscopy, X-ray diffraction, thermal analysis, microhardness testing, and positron annihilation spectroscopy. The distinct changes in microhardness curves as well as in a heat flow of the alloys studied are mainly caused by dissolution of clusters and precipitation of particles from the Al-Zn-Mg-Cu system. An easier diffusion of Zn, Mg, and Cu atoms along dislocations is responsible for the precipitation of Zn,Mg,Cu-containing particles at lower temperatures compared to the mould-cast alloys The mould-cast and coldrolled alloys contain solute clusters rich in Mg and Zn. Clusters formed in the heat-treated alloys during natural ageing have similar composition but in addition to Mg and Zn contain also Cu. The Cu-concentration increases with increase of period of natural ageing. The mould-cast state after natural ageing contain in addition to solute agglomerates also vacancy clusters formed by agglomeration of thermal vacancies. Addition of Sc and Zr results in a higher hardness above ≈ 270 • C due to a strengthening by Al3(Sc,Zr) particles with a good thermal stability. Sc and Zr have probably no influence on the evolution of solute clusters.

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

Cited by 13 publications

References 36 publications

Simultaneous Increase of Electrical Conductivity and Hardness of Al–1.5 wt.% Mn Alloy by Addition of 1.5 wt.% Cu and 0.5 wt.% Zr

Simultaneous Increase of Electrical Conductivity and Hardness of Al–1.5 wt.% Mn Alloy by Addition of 1.5 wt.% Cu and 0.5 wt.% Zr

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

Early Stages of Precipitation in Mould-Cast, Cold-Rolled and Heat-Treated Aluminium Alloy AA7075 with Sc,Zr-Addition

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