Effect of multi-pass friction stir processing on microstructure and mechanical properties of cast Al-7Fe-5Ni alloy

Soustani, M. Fekri; Taghiabadi, R.; Jafarzadegan, Mostafa; Farahani, Maryam Vasheghani

doi:10.1088/2053-1591/ab3829

Cited by 14 publications

(8 citation statements)

References 42 publications

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“…They are also effective obstacles for the microcracks propagation. Therefore, in agreement with the results obtained by Soustani et al [42], Nouri et al [45], Sato et al [46], and Vyas et al [47], substantial increase of the grain boundary density is expected to improve the hardness and strength of FSPed samples through Hall-Petch (or grain boundary) strengthening. The generation of high density of dislocations in the SZ of FSPed samples has been reported elsewhere [46].…”

Section: Methodssupporting

confidence: 89%

“…As explained before, due to their brittle nature and low bonding strength, the coarse Al 2 Cu and Si particles are potential microcrack initiators in the microstructure. However, decreasing the size and uniform distribution of the brittle compounds in FSPed samples substantially lowers their microcracking tendency, as reported by Soustani et al [42] and Yousefi et al [43]. FSP also increases the bonding strength of particles, thus decreasing their interfacial microcracking susceptibility and improving the load transfer capability of matrix to the second-phase particles [27].…”

Section: Methodsmentioning

confidence: 75%

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Optimizing the mechanical properties of Al-4.5Cu-xSi alloys through multi-pass friction stir processing and post-process aging

Mostafavi

Taghiabadi

Jafarzadegan

2021

Archiv.Civ.Mech.Eng

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The effect of post-process aging on the microstructure and mechanical properties of multi-pass friction stir processed (FSPed) Al-4.5Cu alloy containing Si (1, 3, and 5 wt.%) was studied. According to the results, adding Si improved the fluidity and decreased the porosity content of the alloy. The addition of Si up to 3 wt.% also enhanced the mechanical properties. However, further addition of Si up to 5 wt.% impaired the tensile properties. Applying the first pass of FSP improved the tensile strength and fracture strain of the alloy containing 3 wt.% Si by 25 and 125%, respectively. However, the second and fourth pass of FSP substantially improved the fracture strain, but deteriorated the hardness and tensile strength of the alloy containing 3 wt.% Si. Post-FSP aging at 180 °C for 8 h significantly improved the mechanical properties. For instance, compared to the as-cast condition, the hardness, tensile strength, fracture strain, and toughness of post-aged four-pass FSPed Al-4.5Cu-3Si alloy increased by 107, 108, 175, and 310%, respectively. According to the fractography results, the fracture surface morphology of Al-4.5Cu-3Si alloy changed from a quasi-cleavage mode in as-cast condition to a ductile-dimple fracture mode after post-FSP aging.

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Section: Methodssupporting

confidence: 89%

Section: Methodsmentioning

confidence: 75%

Optimizing the mechanical properties of Al-4.5Cu-xSi alloys through multi-pass friction stir processing and post-process aging

Mostafavi

Taghiabadi

Jafarzadegan

2021

Archiv.Civ.Mech.Eng

Self Cite

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“…Under the same number of 3D transition atoms (n) in the melt, the interfacial energy per square decimeter can be considered equal, due to slight differences. So, Equation (12) shows that the change in Gibbs free energy only determines the primary homogeneous nucleation rate.…”

Section: Gibbs Free Energy Of Al 13 Fe 4 Nucleus In Al-fe Meltmentioning

confidence: 99%

“…These ternary Al-Fe-X alloys render high strength at temperatures up to 400 °C [ 7 , 8 ]. For instance, the addition of Ni refines the Al 13 Fe 4 phase and promotes the formation of orthorhombic Al 3 Ni and monoclinic Al 9 FeNi phases [ 8 , 9 , 10 ], improving the high-temperature mechanical properties and decreasing the thermal expansion coefficient (TEC) of the Al-Fe alloys [ 11 , 12 ]. Additionally, instead of forming an AlCr binary compound, Cr prefers to dissolve in the Al 13 Fe 4 phase and improve the morphology, whereas the presence of Mn stabilizes the metastable Al 6 Fe phase and forms an Al 6 (Fe,Mn) solid-solution.…”

Section: Introductionmentioning

confidence: 99%

Influence of Cr, Mn, Co and Ni Addition on Crystallization Behavior of Al13Fe4 Phase in Al-5Fe Alloys Based on ThermoDynamic Calculations

Pang¹,

Shi²,

Wang³

et al. 2021

Materials

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Alloying is an effective method to refine coarse grains of an Al13Fe4 phase and strengthen Al-Fe alloys. However, the grain refinement mechanism remains unclear in terms of the thermodynamics. Herein, the influence of M-element, i.e., Cr, Mn, Co and Ni, addition on the activity of Al and Fe atoms, Gibbs free energy of the Al13Fe4 nucleus in Al-Fe melt and the formation enthalpy of an Al13Fe4 phase in Al-Fe alloys is systematically investigated using the extended Miedema model, Wilson equation, and first-principle calculations, respectively. The results reveal that the addition of different M elements increases the activity of Fe atoms and reduces the Gibbs free energy of the Al13Fe4 nucleus in Al-Fe melt, where the incorporation of Ni renders the most obvious effect, followed by Mn, Co, and Cr. Additionally, the formation enthalpy decreases in the following order: Al78(Fe23Cr) > Al78(Fe23Mn) > Al13Fe4 > Al78(Fe23Ni) > Al78(Fe23Co), where the formation enthalpy of Al78(Fe23Ni) is close to Al78(Fe23Co). Moreover, the presence of Ni promotes the nucleation of the Al13Fe4 phase in Al-Fe alloys, which reveals the mechanism of grain refinement from a thermodynamics viewpoint.

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“…Various studies where multi-pass FSP was employed to obtain ultra-fine grains were carried through [28][29][30][31][32][33][34][35][36][37]. The studies were conducted based on the Hall-Petch method approach.…”

Section: Microstructurementioning

confidence: 99%

Review on Multi-Pass Friction Stir Processing of Aluminium Alloys

Muribwathoho¹,

Mabuwa²,

Msomi³

2020

Preprint

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Aluminium alloys have evolved as suitable materials for automotive and aircraft industries due to their reduced weight, excellent fatigue properties, high-strength to weight ratio, high workability/formability, and corrosion resistance. Recently, the joining of similar and dissimilar metals have achieved huge success in various sectors. The processing of soft metals like aluminium, copper, iron and nickel have been fabricated using friction stir processing. Friction stir processing (FSP) is a microstructural modifying technique that uses the same principles as the friction stir welding technique. In the majority of studies on FSP, the effect of process parameters on the microstructure was characterized after a single pass. However, multiple passes of FSP is another method to further modify the microstructure in aluminium castings. This study is aimed at reviewing the impact of multi-pass friction stir processed joints of aluminium alloys and to identify a knowledge gap. From the literature that is available on multi-pass FSP, it has been observed that the majority of the literature focused on the processing of plates than the joints. There is limited literature reporting on multi-pass friction stir processed joints. This then creates a need to study further on multi-pass friction stir processing on dissimilar aluminium alloys.

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Effect of multi-pass friction stir processing on microstructure and mechanical properties of cast Al-7Fe-5Ni alloy

Cited by 14 publications

References 42 publications

Optimizing the mechanical properties of Al-4.5Cu-xSi alloys through multi-pass friction stir processing and post-process aging

Optimizing the mechanical properties of Al-4.5Cu-xSi alloys through multi-pass friction stir processing and post-process aging

Influence of Cr, Mn, Co and Ni Addition on Crystallization Behavior of Al13Fe4 Phase in Al-5Fe Alloys Based on ThermoDynamic Calculations

Review on Multi-Pass Friction Stir Processing of Aluminium Alloys

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