Microstructural evolution in Al–Mn–Cu–(Be) alloys

Rozman, Niko; Medved, Jožef; Zupanič, Franc

doi:10.1080/14786435.2011.608733

Cited by 18 publications

(16 citation statements)

References 20 publications

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“…This is a result of precipitation of IQC in the matrix that also has a smaller lattice parameter than primary and eutectic IQC. Its value was about 0.46 [24], the same as in binary Al-Mn alloys [25]. However, the IQC precipitates had a quasilattice constant of 0.35 nm in an Al-Mn-Cu-Be-Sc-Zr alloy [19], and the same happened in this case.…”

Section: Heat Treatmentmentioning

confidence: 52%

Ageing of Al-Mn-Cu-Be Alloys for Stimulating Precipitation of Icosahedral Quasicrystals

Bončina

Albu

Zupanič

2020

Metals

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In this work, the ageing of some Al-Mn-Cu-Be alloys was investigated in the temperature range in which predominantly icosahedral quasicrystalline (IQC) precipitates can form. The alloys were cast into a copper mould, directly aged (T5 heat treatment) between 300 and 440 °C for different times. Afterwards, they were examined using scanning and transmission electron microscopy, X-ray diffraction and hardness testing. The main aim of the work was to determine the conditions at which a high number density of spherical icosahedral quasicrystalline precipitates can form. The highest number density of IQC precipitates was obtained at 300 °C after prolonged ageing. The spheroidal precipitates had a diameter less than 20 nm. The size of IQC precipitates increased with the increasing temperature, and in addition, decagonal quasicrystalline precipitates appeared. The time to maximum hardness decreased strongly with increasing ageing temperature. The IQC precipitates can form in a fairly broad temperature range in Al-Mn-Cu-Be alloys and that by varying ageing temperature and duration, rather different distributions of precipitates can be obtained. The presence of precipitates caused rather strong aluminium alloys and fast work hardening during initial plastic deformation.

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Section: Heat Treatmentmentioning

confidence: 52%

Ageing of Al-Mn-Cu-Be Alloys for Stimulating Precipitation of Icosahedral Quasicrystals

Bončina

Albu

Zupanič

2020

Metals

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“…In the literature, it is also known as T-Al 20 Mn 3 Cu 2 [13]. However, this phase was also denoted as τ 1 -Al 29 Mn 6 Cu 4 [10,14] and Al 21 Mn 3 Cu 2 [15].…”

Section: As-cast Microstructurementioning

confidence: 96%

“…The thorough EDS-analyses from 8 different areas of the extracted precipitate in the sample heat-treated for 24 h at 500°C showed that the average atomic concentrations of Al, Mn and Cu were 81.4 ± 0.64%, 12.0 ± 0.61% and 6.6 ± 0.63%, respectively. In the T-phase, there may also have been a small fraction of Be [10].…”

Section: Characteristics Of the T-phasementioning

confidence: 97%

“…Despite the much lower cooling rate than obtained by melt-spinning (about 1000-times), primary and eutectic IQC microstructural constituents can normally be formed upon solidification. Upon heat treatment, different types of precipitates can appear, despite the smaller supersaturation with the alloying elements in comparison to the melt-spun ribbons [10]. Such precipitates have not been studied in detail as yet.…”

Section: Introductionmentioning

confidence: 97%

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Precipitates in a quasicrystal-strengthened Al–Mn–Be–Cu alloy

Zupanič¹,

Wang²,

Gspan³

et al. 2015

Materials Characterization

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“…About half of the QCs in metallic systemsa re metastable, which means rapid-solidification techniques (e. g.,melt-spinning) are required fortheir formation, as shownbySteurer and Deloudia [6]. Forour study, an alloy similar to Al-2Mn-2Be2Cu (at.%) was chosen because of its known tendency for QC (i-phase) formation at moderate cooling rates [5,[7][8][9][10][11][12][13][14][15][16][17][18]. Moreover, copper can be added to the alloy, since it has agood solubility in aluminum, and an umber of research papers, for example [8 -12], have suggested that copper increases the nucleationo ft he QCs and stabilizes the QC i-phase.…”

Section: Introductionmentioning

confidence: 99%

Microstructural changes in quasicrystalline Al–Mn–Be–Cu alloy after various heat treatments

Štrekelj

Naglič

Klančnik³

et al. 2015

International Journal of Materials Research

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Microstructural changesinq uasicrystalline Al-Mn-Be-Cua lloy afterv ariousheat treatmentsIn this studyw ei nvestigated the microstructural changes after av ariety of heat treatments of the quasicrystalline Al -Mn-Be-Cu alloy. In addition, we report on Vickers microhardness measurementsa nd tensile-test results for the same materials. The samples werep roduced in ac onventional manner,i .e., melting in an electrical resistance furnacei na ir and ag ravitational casting process usinga round copper die, which was in the form of at ensile-test specimen withadiameterof5mm. After the casting, some of the samples werej ust solution treated (annealed)a nd then quenched in water, while others were additionally aged (artificially -T 6, or naturally -T 4) or directly aged after the casting. In comparison to the as-cast state, the Vickers microhardness values of the aluminum-based matrix and the tensilep roperties of the samples decreased when just the solutiont reatment, T4 or T6 treatment was performed. The tensile properties also decreased after the heat treatments. Amicrostructural inspection revealed that the microstructural changes occurred already duringt he solution treatment, i. e., the formationo ft he phases Be 4 Al(Mn,Cu) and s 1 -Al 29 Mn 6 Cu 4 on the approximant H-Al 4 Mn and quasicrystalline i-phase particles' edges and the occurrence of precipitatesinthe a Al matrix.The precipitates that would additionally contribute to the hardening of the alloyd id not form. The directly aged samples showed little or no increase in microhardness values in comparison to the as-cast samples, but possibilities of h @ precipitates being formed from the already saturated matrix after the casting could not be excluded.After all the heat treatments the quasicrystalline i-phase, as ap rimary and eutectic phase, was preserved.

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Microstructural evolution in Al–Mn–Cu–(Be) alloys

Cited by 18 publications

References 20 publications

Ageing of Al-Mn-Cu-Be Alloys for Stimulating Precipitation of Icosahedral Quasicrystals

Ageing of Al-Mn-Cu-Be Alloys for Stimulating Precipitation of Icosahedral Quasicrystals

Precipitates in a quasicrystal-strengthened Al–Mn–Be–Cu alloy

Microstructural changes in quasicrystalline Al–Mn–Be–Cu alloy after various heat treatments

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