Solidification of Aluminum-Copper B206 Alloys with Iron and Silicon Additions

Kamga, Honoré Kamguo; Larouche, Daniel; Bournane, M.; Rahem, Ahmed

doi:10.1007/s11661-010-0293-4

Cited by 51 publications

(19 citation statements)

References 8 publications

(8 reference statements)

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“…For alloys B2332 and B3134, the (FeCu) phase was also excluded since it was not present in noticeable quantities. This fact was already observed before and discussed in reference [24] . The absence of (FeCu) phase in B2332 and B3134 explains why there is no downward inflexion of the calculated fraction liquid at around 590°C for these two alloys.…”

Section: Impact Of Alloy Composition On Solidification Path and Hot Tsupporting

confidence: 82%

“…In a recent study on solidification of 206 type alloys [24] , the authors showed that the precipitation of the (FeCu) phase could be partially or completely suppressed depending of the iron to silicon ratio as well as the cooling rate. Under favorable conditions, precipitation of (MnFe) phase can bypass the precipitation of the (FeCu) phase, capturing then almost all the iron available.…”

Section: Introductionmentioning

confidence: 99%

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Hot tearing of aluminum–copper B206 alloys with iron and silicon additions

Kamga

Larouche

Bournane

et al. 2010

Materials Science and Engineering: A

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Hot tearing of B206 aluminum alloys with additions of iron and silicon was studied with constrained mould casting (CRC) to investigate the combined effect of these additions on hot tear resistance. Susceptibility to hot tearing was found to increase gradually with iron content when the conditions were favourable to the formation of the (FeCu) phase. Additions of silicon with a Fe/Si mass ratio ≤ 1 and rapid cooling rates, which together promote the (MnFe) phase at the expense of the (FeCu) phase, were found beneficial to the hot tearing resistance. Hot Tearing Sensitivity (HTS) of the alloys were evaluated with a new index defined to reflect the compliance of the cracked specimens. This index showed an excellent qualitative agreement with the Katgerman's hot tearing index (HCS), providing that one defines the temperature where inadequate feeding starts to be the temperature where 2% of the interdendritic volume is occupied by intermetallic phases. Examinations of the tear surfaces and crack profiles revealed that a premature crack opening created by insufficient healing correlates well the explanations based on the theoretical hot tearing index. The deleterious effect of iron on hot tearing was demonstrated on alloys having a coarse grain microstructure having Ti contents below or equal to 0.01wt%. Above this limit, fine grain microstructures were obtained and the influence of iron was not strong enough to have a significant impact on the castings produced.

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Section: Impact Of Alloy Composition On Solidification Path and Hot Tsupporting

confidence: 82%

Section: Introductionmentioning

confidence: 99%

Hot tearing of aluminum–copper B206 alloys with iron and silicon additions

Kamga

Larouche

Bournane

et al. 2010

Materials Science and Engineering: A

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“…Combined with the morphology and EDS results, it can be found that there are three kinds of phases: dark Chinese script Al 15 (FeMn) 3 (SiCu) 2 (Į-Fe), gray platelet Al 7 Cu 2 (FeMn) (ȕ-Fe) and light Al 2 Cu networks. Besides, the volume fraction of ȕ-Fe is low due to the high addition of Mn, which is in consist with the results of Kamga et al [4] and Tseng et al [10]. in Fig.…”

Section: Resultssupporting

confidence: 90%

“…The platelet ȕ-Fe (Al 7 Cu 2 (FeMn)) and Chinese script Į-Fe (Al 15 (FeMn) 3 (SiCu) 2 ) are often reported in 206 cast alloys at 0.15%Fe and 0.3%Fe [3][4][5]. Recently, Chinese script Al m (FeMn) and platelet Al 3 (FeMn) are experimentally observed in 206 cast alloys at 0.5%Fe [6,7].…”

Section: Introductionmentioning

confidence: 99%

Evolution of Iron-containing Compounds in Al-Cu Alloys during Heat Treatment

2016

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Abstract. The evolution of iron-containing compounds in Al-Cu 206 cast alloy during solution treatment has been investigated. Results show that platelet ȕ-Fe and Chinese script Į-Fe are the two iron-containing compounds in as-cast condition. Little change is observed on ȕ-Fe during solution treatment. However, fine blocky post ȕ-Fe begins to form on Į-Fe when solution treated at 520 o C for 8hrs. When soaking time is extended to 24 hrs, Į-Fe is found to decompose to fine branches while post ȕ-Fe present as clusters on these branches. Al-Cu-Mg-Si Q phase is observed to form at the edge of decomposed Į-Fe, possibly the result of Si from decomposed Į-Fe.

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“…Aluminum alloys such as A201 and A206, which have a magnesium content below 1%, are renowned for their high strength and toughness. They also possess excellent corrosion resistance, and their precipitation hardening during heat treatment results in the highest tensile strength among all aluminum casting alloys [ 1 , 2 , 3 , 4 , 5 ]. However, these alloys have some disadvantages, including a relatively high tendency to hot tearing and low corrosion resistance [ 6 , 7 , 8 , 9 , 10 ].…”

Section: Introductionmentioning

confidence: 99%

Microstructure Evolution and Mechanical Properties of Al–Cu–Mg Alloys with Si Addition

Shah

Siddique

et al. 2023

Materials

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The aim of this study was to investigate the impact of the addition of a minor quantity of Si on the microstructure evolution, heat treatment response, and mechanical properties of the Al–4.5Cu–0.15Ti–3.0Mg alloy. The microstructure analysis of the base alloy revealed the presence of α-Al grains, eutectic α-Al-Al2CuMg (S) phases, and Mg32(Al, Cu)49 (T) phases within the Al grains. In contrast, the Si-added alloy featured the eutectic α-Al-Mg2Si phases, eutectic α-Al-S-Mg2Si, and Ti-Si-based intermetallic compounds in addition to the aforementioned phases. The study found that the Si-added alloy had a greater quantity of T phase in comparison to the base alloy, which was attributed to the promotion of T phase precipitation facilitated by the inclusion of Si. Additionally, Si facilitated the formation of S phase during aging treatment, thereby accelerating the precipitation-hardening response of the Si-added alloy. The as-cast temper of the base alloy displayed a yield strength of roughly 153 MPa, which increased to 170 MPa in the Si-added alloy. As a result of the aging treatment, both alloys exhibited a notable increase in tensile strength, which was ascribed to the precipitation of S phases. In the T6 temper, the base alloy exhibited a yield strength of 270 MPa, while the Si-added alloy exhibited a significantly higher yield strength of 324 MPa. This novel Si-added alloy demonstrated superior tensile properties compared to many commercially available high-Mg-added Al–Cu–Mg alloys, making it a potential replacement for such alloys in various applications within the aerospace and automotive industries.

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Solidification of Aluminum-Copper B206 Alloys with Iron and Silicon Additions

Cited by 51 publications

References 8 publications

Hot tearing of aluminum–copper B206 alloys with iron and silicon additions

Hot tearing of aluminum–copper B206 alloys with iron and silicon additions

Evolution of Iron-containing Compounds in Al-Cu Alloys during Heat Treatment

Microstructure Evolution and Mechanical Properties of Al–Cu–Mg Alloys with Si Addition

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