The effects of microstructure and intermetallic phases of directionally solidified Al–Fe alloys on microhardness

Silva, Bismarck Luiz; Garcia, Amauri; Spinelli, José Eduardo

doi:10.1016/j.matlet.2012.08.130

Cited by 39 publications

(19 citation statements)

References 22 publications

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“…2(a) shows the typical as-cast dendritic structure with pro-eutectic zones in dark (zone A) and Fe-rich eutectic zones in bright (zone B). Similar as-cast structures have been described in previous works [5][6][7]29,[43][44][45][46]. The HAADF STEM image ( Fig. 2(b)) shows similar zones at a higher magnification and clearly exhibits in bright the fine-scaled intermetallic particles within the eutectic areas (labeled B and B').…”

Section: Methodssupporting

confidence: 83%

Structure and mechanical behavior of ultrafine-grained aluminum-iron alloy stabilized by nanoscaled intermetallic particles

et al. 2019

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Ultrafine-grained aluminum alloys offer interesting multifunctional properties with a combination of high strength, low electrical resistivity, and low density. However, due to thermally induced grain coarsening, they typically suffer from an intrinsic poor thermal stability. To overcome this drawback, an Al-2%Fe alloy has been selected because of the low solubility of Fe in Al and their highly positive enthalpy of mixing leading to the formation of stable intermetallic particles. The two-phase alloy has been processed by severe plastic deformation to achieve simultaneously submicrometer Al grains and a uniform distribution of nanoscaled intermetallic particles. The influence of the level of deformation on the microstructure has been investigated thanks to transmission electron microscopy and atom probe tomography and it is shown that for the highest strain a partial dissolution of the metastable Al6Fe particle occurred leading to the formation of a Fe super saturated solid solution. The thermal stability, and especially the precipitation of particles from the ultrafine-grained solid solution and the way they pin grain boundaries has been investigated both from static annealing and in-situ transmission electron microscopy experiments. The correlation between microstructural features and microhardness has been established to identify the various strengthening contributions. Finally, it is 2 shown that ultrafine grained high purity Al with less than 0.01 at. % Fe in solid solution could preserve a grain size only 300nm after 1h at 250°C.

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Section: Methodssupporting

confidence: 83%

Structure and mechanical behavior of ultrafine-grained aluminum-iron alloy stabilized by nanoscaled intermetallic particles

et al. 2019

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“…) have been proposed to relate hardness and the microstructural scale of Al-Fe and Zn-Cu alloys 21,22 , relations like that were not found in literature of cast iron. Hence, the effect of λ 2 on Brinell hardness of the cast iron can be seen in Figure 9 through the purpose of a Hall-Petch fitting with the present experimental scatter.…”

Section: Resultsmentioning

confidence: 99%

Transient Directional Solidification of Cast Iron: Microstructure Formation, Columnar to Equiaxed Transition and Hardness

Spinola

Spinelli

2016

Mat. Res.

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A number of applications may require cast iron. Engine cylinder blocks, flywheels, gearbox cases, machine-tool bases may be manufactured by using grey cast iron while bearing surfaces with white cast iron. Thus, understanding the solidification behaviour of eutectic cast iron becomes an essential task, with certain points to be accomplished. Transient directional solidification may provide particular advantages in order to deal with these items, such as the large variation of growth rate (V) and cooling rate (Ṫ) values, which may allow a variety of microstructures and morphologies to be studied. The aim of this work is to examine the macrostructure regions, scale of the dendritic microstructure, proportions of the formed phases and hardness of samples obtained by transient directional solidification of a eutectic cast iron (Fe-3.5wt%C-2.5wt%Si). It was shown that a CET criterion should be based on a critical V value at the solidification front of about 0.6 mm/s. The effects of the formed phases, their proportions and λ 2 on hardness of the cast alloy are assessed.

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“…[21][22][23][24]. Many correlations are proposed to evaluate the strength by hardness test for steels [21,25,26], Al-based alloys [27][28][29][30][31][32][33][34], Cu-based alloys [22,35], Zn-based alloys [36,37], Sn-based alloys [38][39][40], and TiAl alloys [15-20, 41, 42]. However, few researches focus on the correlations between hardness and tensile strength of TiAl intermetallics alloys.…”

Section: A N U S C R I P Tmentioning

confidence: 99%

Effect of solidification parameters on microstructural characteristics and mechanical properties of directionally solidified binary TiAl alloy

Fan

Liu

Tian

et al. 2015

Journal of Alloys and Compounds

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The effects of microstructure and intermetallic phases of directionally solidified Al–Fe alloys on microhardness

Cited by 39 publications

References 22 publications

Structure and mechanical behavior of ultrafine-grained aluminum-iron alloy stabilized by nanoscaled intermetallic particles

Structure and mechanical behavior of ultrafine-grained aluminum-iron alloy stabilized by nanoscaled intermetallic particles

Transient Directional Solidification of Cast Iron: Microstructure Formation, Columnar to Equiaxed Transition and Hardness

Effect of solidification parameters on microstructural characteristics and mechanical properties of directionally solidified binary TiAl alloy

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