Effect of heat treatment on properties of thixoformed high performance 2014 and 201 aluminium alloys

Liu, D.; Atkinson, Helen V.; Kapranos, P.; Jones, H.

doi:10.1023/b:jmsc.0000007732.04363.81

Cited by 45 publications

(34 citation statements)

References 5 publications

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“…As shown, the average grain size of samples has increased with increasing soaking time and temperature. Obviously, a long holding time can promote grains to coarsen rapidly according to the Osward theory [16,17]. This situation is more intensive in extruded samples.…”

Section: Resultsmentioning

confidence: 99%

An Investigation on the Effects of Pre-deformation and Temperature on Thixotropic Microstructure of AA2014 Aluminum Alloy

Güven

2015

Trans Indian Inst Met

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With copper as the main alloying addition, alloy from the 2XXX family offers high strength at low specific weight and are widely employed for aircraft, wheels and major structural components. However, they suffer from low forming speeds and require high forming pressures. Hence, it is very attractive to form these alloys in semisolid state for technical and economical reasons. In this study, one of the most important wrought alloys for aerospace applications, AA2014 was used. In order to form the best semi-solid forming products, thixotropic character must be known. For this purpose, AA2014 alloy ascast and warm extruded samples were heated to 600, 610 and 620°C in semi-solid region and held for 0, 5 and 10 min in the induction coil. All samples were cooled with water at room temperature. Microstructure analysis was conducted with metallographic methods and shape factor values were calculated. With increasing predeformation rate and heating temperature, the shape factor increases. Experimental results show that spherical shaped thixotropic microstructures which is required for semi-solid forming can be created in AA2014 alloy.

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Section: Resultsmentioning

confidence: 99%

An Investigation on the Effects of Pre-deformation and Temperature on Thixotropic Microstructure of AA2014 Aluminum Alloy

Güven

2015

Trans Indian Inst Met

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“…Segregation and distribution of the alloying elements has a great influence on the microstructural evolution during semi-solid treatment. Moreover, this affects the mechanical properties of the subsequent thixoformed parts [32][33][34]. Figure 6 shows the SEM images of the compressed samples heat treated at 600˝C (Figure 6a Figure 7.…”

Section: Phase Evolution and Alloying Element Distribution During Parmentioning

confidence: 99%

Phase Evolution and Mechanical Behavior of the Semi-Solid SIMA Processed 7075 Aluminum Alloy

Binesh

Aghaie-Khafri

2016

Metals

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Microstructural and mechanical behaviors of semi-solid 7075 aluminum alloy were investigated during semi-solid processing. The strain induced melt activation (SIMA) process consisted of applying uniaxial compression strain at ambient temperature and subsequent semi-solid treatment at 600-620˝C for 5-35 min. Microstructures were characterized by scanning electron microscope (SEM), energy dispersive spectroscopy (EDS), and X-ray diffraction (XRD). During the isothermal heating, intermetallic precipitates were gradually dissolved through the phase transformations of α-Al + η (MgZn 2 ) Ñ liquid phase (L) and then α-Al + Al 2 CuMg (S) + Mg 2 Si Ñ liquid phase (L). However, Fe-rich precipitates appeared mainly as square particles at the grain boundaries at low heating temperatures. Cu and Si were enriched at the grain boundaries during the isothermal treatment while a significant depletion of Mg was also observed at the grain boundaries. The mechanical behavior of different SIMA processed samples in the semi-solid state were investigated by means of hot compression tests. The results indicated that the SIMA processed sample with near equiaxed microstructure exhibits the highest flow resistance during thixoforming which significantly decreases in the case of samples with globular microstructures. This was justified based on the governing deformation mechanisms for different thixoformed microstructures.

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“…Despite the effect of the necks on the tensile properties, the characteristics of the liquid phase (eutectic phase) appeared to dominantly influence the tensile properties of the semisolid alloys [38]. The results of the quantitative energy-dispersive X-ray spectroscopy (EDS) analyses at grain boundaries of the AA2024 and AA6061 alloys are shown in Fig.…”

Section: Tensile Propertiesmentioning

confidence: 99%

Correlation between solid fraction and tensile properties of semisolid RAP processed aluminum alloys

Bolouri¹,

Kang²

2012

Journal of Alloys and Compounds

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Effect of heat treatment on properties of thixoformed high performance 2014 and 201 aluminium alloys

Cited by 45 publications

References 5 publications

An Investigation on the Effects of Pre-deformation and Temperature on Thixotropic Microstructure of AA2014 Aluminum Alloy

An Investigation on the Effects of Pre-deformation and Temperature on Thixotropic Microstructure of AA2014 Aluminum Alloy

Phase Evolution and Mechanical Behavior of the Semi-Solid SIMA Processed 7075 Aluminum Alloy

Correlation between solid fraction and tensile properties of semisolid RAP processed aluminum alloys

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