A study of microstructure and microsegregation of aluminum 7050 alloy

Xie, Fanyou; Yan, Xinyan; Ding, Lei; Zhao, Fan; Chen, Shuanglin; Chu, Miensheng; Chang, Y. A.

doi:10.1016/s0921-5093(03)00056-x

Cited by 119 publications

(57 citation statements)

References 16 publications

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“…Fig. 19, reproduced by courtesy of Xie et al [158], shows a comparison between calculated and measured microsegregation for one of the components of the alloy and calculated phase fractions. The measurements stem from area scans over large sections from within a directionally solidified sample, processed under a thermal gradient G = 4.5 Â 10 3 K/m with a cooling rate of 0.45 K/ s. From Fig.…”

Section: The Solidification Path and Microstructure Formationmentioning

confidence: 99%

“…Based on their work Liang et al [157] discussed the importance of reliable thermodynamic data, and proceeded to reevaluate the ternary phase diagram as to improve the quality of the model predictions. Recently, Xie et al [158] presented an investigation of microstructure and microsegregation in the aluminum alloy 7050 containing 11 components, that forms six different intermetallic phases in subsequent eutectic reactions during solidification. Modeling was based on a modified Scheil model taking into account solid state diffusion, dendrite undercooling and coarsening, with dynamic coupling to phase diagram calculations.…”

Section: The Solidification Path and Microstructure Formationmentioning

confidence: 99%

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Multiphase solidification in multicomponent alloys

Hecht

Gránásy

Pusztai

et al. 2004

Materials Science and Engineering: R: Reports

167

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Section: The Solidification Path and Microstructure Formationmentioning

confidence: 99%

Section: The Solidification Path and Microstructure Formationmentioning

confidence: 99%

Multiphase solidification in multicomponent alloys

Hecht

Gránásy

Pusztai

et al. 2004

Materials Science and Engineering: R: Reports

167

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“…The precipitates containing the impurity elements Si and Fe are stable to higher temperatures than the applied heat treatment temperatures [16,17].…”

Section: Proceedings Of the International Symposium On Physics Of Matmentioning

confidence: 99%

Microstructure and Properties of Spark Plasma Sintered Al-Zn-Mg-Cu Alloy

et al. 2015

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The microstructure of an aluminum alloy containing 53 wt% Zn, 2.1 wt% Mg and 1.3 wt% Cu as main alloying elements has been studied with the focus on the precipitation behavior during the spark plasma sintering process. The starting material was an atomized AlZnMgCu powder with the particle size below 50 µm. The particles showed a solidication microstructure from cellular to columnar or equiaxed dendritic morphology with a large fraction of the alloying elements segregated in form of intermetallic phases, mainly (Zn,Al,Cu)49Mg32 and Mg2(Zn,Al,Cu)11, at the cell and dendrite boundaries. The microstructure of the sintered specimens followed the microstructure of the initial powder. However, Mg(Zn,Al,Cu)2 precipitates evolve at the expense of the initial precipitate phases. The precipitates which were initially continuously distributed along the intercellular and interdendritic boundaries form discrete chain-like structures in the sintered samples. Additionally, ne precipitates created during the sintering process evolve at the new low-angle boundaries. The large fraction of precipitates at the grain boundaries and especially at the former particle boundaries could not be solved into the matrix applying a usual solid solution heat treatment. A bending test reveals low ductility and strength. The mechanical properties suer from the precipitates at former particle boundaries leading to fracture after an outer ber tensile strain of 3.8%.

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“…In spite of its robust nature and relative simplicity it can induce some voids and defects in the ingots. High cooling rates and non-equilibrium solidification conditions of the DC-casting result in the formation of nonequilibrium eutectics and intermetallics, which mainly precipitate on the grain boundaries and interdendritic spaces during final stages of solidification [2,3]. The formation of such phases coincides with the appearance of thermal stresses when the dendritic grains start to form a coherent network [4].…”

Section: Introductionmentioning

confidence: 99%

Cold cracking in DC-cast high strength aluminum alloy ingots: An intrinsic problem intensified by casting process parameters

Lalpoor

Eskin

Ruvalcaba

et al. 2011

Materials Science and Engineering: A

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a b s t r a c tFor almost half a century the catastrophic failure of direct chill (DC) cast high strength aluminum alloys has been challenging the production of sound ingots. To overcome this problem, a criterion is required that can assist the researchers in predicting the critical conditions which facilitate the catastrophic failure of the ingots. This could be achieved at first glance by application of computer simulations to assess the level and distribution of residual thermal stresses. However, the simulation results are only able to show the critical locations and conditions where and when high stresses may appear in the ingots. The prediction of critical void/crack size requires simultaneous application of fracture mechanics. In this paper, we present the thermo-mechanical simulation results that indicate the critical crack size distribution in several DCcast billets cast at various casting conditions. The simulation results were validated upon experimental DC-casting trials and revealed that the existence of voids/cracks with a considerable size is required for cold cracking to occur.

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A study of microstructure and microsegregation of aluminum 7050 alloy

Cited by 119 publications

References 16 publications

Multiphase solidification in multicomponent alloys

Multiphase solidification in multicomponent alloys

Microstructure and Properties of Spark Plasma Sintered Al-Zn-Mg-Cu Alloy

Cold cracking in DC-cast high strength aluminum alloy ingots: An intrinsic problem intensified by casting process parameters

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