Precipitation during recrystallization in aluminum alloys with a small amount of iron and silicon

Fabrication of Fe-Based Metallic Glass Particle Reinforced Al-Based Composite Materials by Friction Stir Processing

“…The precipitates formed in the stir zone, since precipitation as well as dynamic recrystallization are specific phenomena of the FSP. According to the studies of Nagahama et al on the relationship of recrystallization and precipitation of the Al-Fe alloy, 19) when the precipitates are formed during the recrystallization process, large precipitates are formed in the subgrain boundary and small precipitates are formed in the internal subgrain boundary. On the other hand, precipitates formed after recrystallization are very small and the shape of precipitates is needle-like or discoid- Fig.…”

Precipitation in an Al-300 ppm Fe Alloy

“…The metastable precipitate phase, which was detected in in Mössbauer spectra of 89% cold-rolled and aged Al-0.05% Fe specimens, 7) should be corresponding to Al 6 Fe from the results of the present study. Nagahama and Miki 9) concluded on the basis of analyses of an electron diffraction pattern, taken on an Al-0.043% Fe specimen quenched from 915 K, 93% cold-rolled and then aged at 623 K for 18 ks, that the metastable phase precipitates were difficult to be formed, but the lattice spacings in Al 3 Fe and Al 6 Fe are close to each other. So analyses with only low indices planes like Fig.…”

“…Identification of Al 3 Fe by Nagahama and Miki 9) was based on only one SADP, and they mentioned that the identification of precipitates was difficult because lattice spacings in Al 6 Fe and Al 3 Fe are close to one another. Ito et al 10) identified the Al 6 Fe metastable precipitate, from analyses of several SADP's taken on 95% cold-rolled Al-0.03 mass% Fe alloy, but did not mentioned on the stable precipitate, Al 3 Fe.…”

“…Bush et al 7,8) deduced formation of metastable phase from analyses of Mössbauer spectra, 7) and suggested that the metastable phase was Al 6 Fe. 8) Nagahama and Miki 9) identified Al 3 Fe by transmission electron microscopy (TEM) and mentioned that Al 6 Fe is difficult to precipitate. On the other hand, Ito et al 10) showed precipitation of Al 6 Fe in Al-0.03 mass% Fe alloy by TEM observations on the coled-rolled and aged specimens.…”

Precipitation during Recrystallization in Al–Mn and Al–Cr Alloys

“…The resistivity change due to the lattice defects by according to a previous experiment (26) and the resistivity decrease due to the annihilation of lattice defects at each aging stage was calculated from the following equation :…”