Effect of Melt Conditioning on Removal of Fe from Secondary Al-Si Alloys Containing Mg, Mn, and Cr

Becker, Hanka; Thum, Angela; Distl, Benedikt; Kriegel, Mario J.; Leineweber, Andreas

doi:10.1007/s11661-018-4930-7

Cited by 25 publications

(40 citation statements)

References 69 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…At intermediate investigated cooling rates (1.4 K/s), the α h phase is not observed, in agreement with [55] where a cooling rate of 0.5 K/ s was applied. That can be attributed to retarded nucleation of α h as compared to the β phase [55]. Accordingly, primary β phase has developed.…”

Section: The Ternary Alloysupporting

confidence: 87%

“…The x Mn /(x Mn + x Fe ) ratio in the α c phase increases with increasing Mn content in the alloy and is accompanied by an increase in the Si content. The chemical composition of the α c phase in coarse polyhedral and Chinese-script morphology differs, as observed previously in [55]. This α c phase in Chinese-script morphology shows higher Si contents and lower x Mn /(x Mn + x Fe ) ratios than the coarse polyhedral α c particles.…”

Section: Chemical Compositionsupporting

confidence: 69%

“…In the ternary Al7.1Si1.5Fe-alloy, the primary phase forming at the slowest cooling rate of 0.05 K/s is the α h phase, as expected for equilibrium solidification conditions [55]. Only few but very large bulk polyhedral particles have been observed indicating a low nucleation rate.…”

Section: The Ternary Alloysupporting

confidence: 59%

See 2 more Smart Citations

Effect of Mn and cooling rates on α-, β- and δ-Al–Fe–Si intermetallic phase formation in a secondary Al–Si alloy

et al. 2019

View full text Add to dashboard Cite

Secondary Al-Si alloys Al7.1Si(1.5-x Mn )Fe(x Mn )Mn with x Mn = 0, 0.3, 0.375, 0.6, 0.75 at.% have been solidified with different cooling rates: 0.05 K/s, 1.4 K/s, 11.4 K/s and 200 K/s. In the ternary alloy with x Mn = 0 at.%, formation of the primary α h phase is suppressed upon higher cooling rates at the cost of formation of plate-shaped β and δ phase particles. In the quaternary alloys, with increasing Mn content, α c -phase particles with Chinese-script morphology form and replace the plate-shaped intermetallic particles. While the α c phase forms at intermediate cooling rates only, plate-shaped particles additionally form at low and high cooling rates. The β phase dominates after solidification with lower cooling rates and the δ phase dominates upon higher cooling rates in the plate-shaped particles. The kinetic effect in terms of solidification rate and the chemical composition effect on the phase selection of Fe-containing intermetallic particles in the alloys along the solidification path have been discussed.

show abstract

Section: The Ternary Alloysupporting

confidence: 87%

Section: Chemical Compositionsupporting

confidence: 69%

See 1 more Smart Citation

Effect of Mn and cooling rates on α-, β- and δ-Al–Fe–Si intermetallic phase formation in a secondary Al–Si alloy

et al. 2019

View full text Add to dashboard Cite

show abstract

“…During previously conducted investigations on the formation of intermetallic particles in a secondary, Fe-containing Al-Si alloy [27], we have encountered significant backscatter electron contrast differences within the plate-shaped particles suggesting a multiphase character due to intergrowth of β and δ phase (not illustrated in the previous study [27]). Therefore, a clear distinction between the two phases is required for a thorough and correct investigation of the phase formation in presence of plate-shaped particles.…”

Section: Introductionmentioning

confidence: 67%

β- and δ-Al-Fe-Si intermetallic phase, their intergrowth and polytype formation

Becker

Bergh

Vullum

et al. 2019

Journal of Alloys and Compounds

View full text Add to dashboard Cite

Crystal structure characteristics of coexisting  and δ phase were investigated in a purely intermetallic Al-Fe-Si alloy and in plate-shaped intermetallic particles formed in a model secondary Al7.1Si1.2Fe0.3Mn alloy. The βand the δ-Al-Fe-Si intermetallic phase are thermodynamic and crystallographic distinct phases despite some structural similarities. Nevertheless, both phases can appear severely intergrown within single plate-shaped particles after solidification of Fe-containing secondary Al-Si alloys under non-equilibrium conditions which is attributed to the good fit along the (001) planes of both phases. Thereby, few layers of the δ-like stacking sequences within the β phase can be considered as a typical planar defect of the β phase. The β phase exhibits polytype structures for which structural models have been formulated based on ordering of the constituting double layers being shifted by a/2 or b/2 displacements leading to 4 different double layer positions A, B, C, and D. An AB polytype with idealized Acam symmetry actually shows a monoclinic distortion towards A12/a1 symmetry. An ABCD polytype with idealized I4 1 /acd symmetry has been derived, too. Next to the ordered polytypes, stackings with non-periodic sequences of A, B, C and D double layers exist.

show abstract

“…Mn addition mainly improves the mechanical properties of the alloy from two aspects. Firstly, Mn can stimulate the transformation of Fe-containing phase from needle-like β-Al 5 FeSi to Chinese script-like α-Al 15 (Fe, Mn) 3 Si 2 during the solidification process [ 22 , 23 ]. Secondly, a small amount of Mn can form the coherent dispersoids in the matrix at high temperature.…”

Section: Introductionmentioning

confidence: 99%

Morphological Evolutions of Ni-Rich Phases in Al-Si Piston Alloys during 250–400 °C Thermal Exposure Processes

Geng

Bian

et al. 2020

Materials

View full text Add to dashboard Cite

The thermal stability of the Al-Si alloys during the thermal exposure process from 250 °C to 400 °C was systematically investigated. The relationships between the morphological evolution and the mechanical changes of the alloys were determined through the Vickers hardness test and materials characterization method. Initially, the alloys exhibited similar thermal degradation behavior. For example, the exposure process of the alloy at 300 °C can be divided into two stages according to the changes of the alloy hardness and the matrix micro-hardness. In detail, the first stage (0–2 h) exhibited a severe reduction of the alloy hardness while the second stage showed a more leveled hardness during the following 98 h. There are three identified morphological characteristics of Ni-rich phases in the alloy. Furthermore, the differences in both composition and the micro-hardness between these Ni-rich phases were confirmed. The underlying relationships between the morphological transformation of the Ni-rich phases and hardness fluctuation in the alloy were correlated and elucidated. The observed alloy hardness increase when the exposure temperature was 400 °C was unexpected. This behavior was explained from the perspectives of both Ni-rich phases evolution and dispersoid formation.

show abstract

Effect of Melt Conditioning on Removal of Fe from Secondary Al-Si Alloys Containing Mg, Mn, and Cr

Cited by 25 publications

References 69 publications

Effect of Mn and cooling rates on α-, β- and δ-Al–Fe–Si intermetallic phase formation in a secondary Al–Si alloy

Effect of Mn and cooling rates on α-, β- and δ-Al–Fe–Si intermetallic phase formation in a secondary Al–Si alloy

β- and δ-Al-Fe-Si intermetallic phase, their intergrowth and polytype formation

Morphological Evolutions of Ni-Rich Phases in Al-Si Piston Alloys during 250–400 °C Thermal Exposure Processes

Contact Info

Product

Resources

About