Precipitation in cold-rolled Al–Sc–Zr and Al–Mn–Sc–Zr alloys prepared by powder metallurgy

Vlach, Martin; Stulı́ková, Ivana; Smola, Bohumil; Kekule, Tomáš; Kudrnová, Hana; Daniš, S.; Gemma, Ryota; Očenášek, Vladivoj; Málek, Jaroslav; Tanprayoon, Dhritti; Neubert, Volkmar

doi:10.1016/j.matchar.2013.09.010

Cited by 50 publications

(42 citation statements)

References 43 publications

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“…7. Microstructure analysis of the HE alloy also confirms the existence of the Al 6 Mn-phase particles with the size of ∼ 30 nm in (sub)grain interiors and hundreds of nanometres at (sub)grain boundaries in the alloy annealed up to 450 XRD analysis (performed earlier in the same alloys similarly treated) also confirms existence of the Al 6 Mn and/or Al 6 (Mn,Fe) particles in the bulk samples; although peaks were relatively weak due to a small volume fraction, they were clearly indexed on the base of the Al 6 Mn and/or Al 6 (Mn,Fe) phase [6,19,23,27,40,41]. Therefore one can suggest that the II-stage is very probably due to a formation of Mn-containing particles at (sub)grain boundaries and the III-stage is connected with a formation of the Al 6 Mn phase in (sub)grain interiors.…”

Section: Diffusivity Of Mn Atoms In Al Is Relatively Low At Temperatusupporting

confidence: 66%

“…The area of a Gaussian peak reflects the volume fraction development of the individual phases precipitating. One can see a low temperature stage with a maximum at ∼ 290 Temperature position of the I-stage does not differ from that observed in the AlMnScZr alloys prepared by different procedures [6,27,30]. The I-stage was found there to be caused by the additional precipitation of the L1 2 -structured Sc,Zr-containing particles.…”

Section: Resultsmentioning

confidence: 59%

“…• C [6,23,27]. Taking into account the Sc-and Zr-behaviour at comparable temperatures [38,39] and the known contribution of the unit Mn-, Sc-and Zrconcentration to the resistivity of Al (e.g.…”

Section: Diffusivity Of Mn Atoms In Al Is Relatively Low At Temperatumentioning

confidence: 99%

“…or to provide extra strength to the alloy through precipitation hardening [2,24]. Hot deformation of Mn, Sc and Zr containing Al alloys can add other improvements connected with substantial grain refinement and/or can increase stability to elevated temperatures over long periods of time [27,28]. The aim of the present work was to study the phase transformations and recrystallization behaviour of the hot-deformed Al-Mn-Sc-Zr alloys during isochronal and isothermal annealing.…”

Section: Introductionmentioning

confidence: 99%

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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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Section: Diffusivity Of Mn Atoms In Al Is Relatively Low At Temperatusupporting

confidence: 66%

Section: Resultsmentioning

confidence: 59%

Section: Diffusivity Of Mn Atoms In Al Is Relatively Low At Temperatumentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

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

Vlach¹,

Stulı́ková²,

Smola³

et al. 2021

Self Cite

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show abstract

“…The methods how to preserve the submicrometric size of the grains are under intensive research (e.g. [11]). By adding small amounts of zirconium into aluminum alloys metastable coherent dispersoids Al 3 Zr with cubic L1 2 structure can be formed.…”

Section: Introductionmentioning

confidence: 99%