Microscopic characterization of semi-solid aluminium alloys

Lu, Yao; Li, Miaoquan; Li, Xingcheng; Xiao-ping, LI

doi:10.1007/s12613-010-0307-7

Cited by 5 publications

(4 citation statements)

References 24 publications

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“…The semi-solid casting [ 9 ], deformation process [ 10 ], heat treatment [ 11 ], and many other methods [ 12 ] can all determine the phase transformation and microstructure evolution of aluminum alloys. However, uneven cooling rate in different regions of the ingots during direct chill (DC) casting results in the formation of severe interdendritic segregation and coarse intermetallics, which gravely affect the followed processabilities and hampers service performance [ 13 , 14 , 15 ].…”

Section: Introductionmentioning

confidence: 99%

Influence of Homogenization on Microstructural Response and Mechanical Property of Al-Cu-Mn Alloy

et al. 2018

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The evolution of the microstructures and properties of large direct chill (DC)-cast Al-Cu-Mn alloy ingots during homogenization was investigated. The results revealed that the Al-Cu-Mn alloy ingots had severe microsegregation and the main secondary phase was Al2Cu, with minimal Al7Cu2Fe phase. Numerous primary eutectic phases existed in the grain boundary and the main elements were segregated at the interfaces along the interdendritic region. The grain boundaries became discontinuous, residual phases were effectively dissolved into the matrix, and the segregation degree of all elements was reduced dramatically during homogenization. In addition, the homogenized alloys exhibited improved microstructures with finer grain size, higher number density of dislocation networks, higher density of uniformly distributed θ′ or θ phase (Al2Cu), and higher volume fraction of high-angle grain boundaries compared to the nonhomogenized samples. After the optimal homogenization scheme treated at 535 °C for 10 h, the tensile strength and elongation% were about 24 MPa, 20.5 MPa, and 1.3% higher than those of the specimen without homogenization treatment.

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Section: Introductionmentioning

confidence: 99%

Influence of Homogenization on Microstructural Response and Mechanical Property of Al-Cu-Mn Alloy

et al. 2018

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“…In fact, metal foams are heterogeneous cellular structures made of metal and gas (usually air) characterized by a very low apparent density [1][2][3][4][5][6][7][8][9][10][11]. This gives foams high stiffness-to-weight ratio and lightweight.…”

Section: Introductionmentioning

confidence: 99%

“…), apparent density, and pore size. In such a way, the most appropriate foams can be tailored to specific engineering design applications, ranging from mechanical to automotive, gas and fluid filtration, thermal management and many others [1][2][3][4][5][6][7][8][9][10].…”

Section: Introductionmentioning

confidence: 99%

Metal Foams for Electromagnetics: Experimental, Numerical and Analytical Characterization

Catarinucci¹,

Monti²,

Tarricone³

2012

PIER B

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Abstract-This work focuses on the use of metal foams, a relatively new class of materials, for high added-value electromagnetic (EM) shields. First, the Shielding Effectiveness (SE) of aluminum foam slabs is experimentally evaluated, showing very good shielding properties. Successively, accurate numerical models of metal foams are proposed and used in a proprietary Variable-Mesh Parallel Finite Difference Time Domain code, in order to characterize the EM properties of slabs of such materials. Afterwards, a third approach is adopted. It consists in the application of the effective medium theories in order to obtain an analytical EM model of the metal foams; this way, their SE can be evaluated with a negligible computational time by using common mathematical tools. Finally, a methodology to design/analyze customized metal foams for EM shield applications is suggested. It takes advantage from the joint use of the numerical and analytical presented approaches, thus allowing a computationally efficient evaluation of SE and other electromagnetic properties of metal foams. Results demonstrate the suitability of metal foam structures for effective EM shielding in many industrial applications, as well as the accuracy of the proposed analytical and numerical approaches.

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“…Microstructure evolution and phase transformation of aluminum alloys can be changed and controlled by many methods, such as semi-solid cast [15] and heat treatment [16]. Due to containing higher alloying content than other conventional 7xxx series alloys, the 7A55 aluminum alloy will form more non-equilibrium phases during the semicontinuous casting.…”

Section: Introductionmentioning

confidence: 99%

Research on microstructure in as-cast 7A55 aluminum alloy and its evolution during homogenization

Guo

et al. 2011

Rare Metals

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The microstructure of the as-cast 7A55 aluminum alloy and its evolution during homogenization were investigated by means of optical microscopy (OM), scanning electron microscopy (SEM), energy dispersive spectroscopy (EDS), X-ray diffraction (XRD), and differential scanning calorimetry (DSC) analysis. The results indicate that the microstructure of the as-cast 7A55 aluminum alloy mainly consists of the dendritic network of aluminum solid solution, Al/AlZnMgCu eutectic phases, and intermetallic compounds MgZn 2 , Al 2 CuMg, Al 7 Cu 2 Fe, and Al 23 CuFe 4 . After homogenization at 470°C for 48 h, Al/AlZnMgCu eutectic phases are dissolved into the matrix, and a small amount of high melting-point secondary phases were formed, which results in an increasing of the starting melting temperature of 7A55 aluminum alloy. The high melting-point secondary phases were eliminated mostly when the homogenization time achieved to 72 h. Therefore, the reasonable homogenization heat treatment process for 7A55 aluminum alloy ingots was chosen as 470°C/72 h.

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Microscopic characterization of semi-solid aluminium alloys

Cited by 5 publications

References 24 publications

Influence of Homogenization on Microstructural Response and Mechanical Property of Al-Cu-Mn Alloy

Influence of Homogenization on Microstructural Response and Mechanical Property of Al-Cu-Mn Alloy

Metal Foams for Electromagnetics: Experimental, Numerical and Analytical Characterization

Research on microstructure in as-cast 7A55 aluminum alloy and its evolution during homogenization

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