A DSC analysis of thermodynamic properties and solidification characteristics for binary Cu–Sn alloys

Zhai, Wei; Wang, W.L.; Geng, D. L.; Wei, Baogang

doi:10.1016/j.actamat.2012.08.013

Cited by 65 publications

(24 citation statements)

References 27 publications

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“…The solidified samples were characterized by Zeiss Axiovert optical microscope (OM), FEI Sirion 200 scanning electron microscope (SEM) and Oxford INCA 300 energy dispersive spectrometer (EDS). and its solidification interval between primary phase and peritectic reaction is 191 K [5]. To predict the solidification mode under non-equilibrium condition, nucleation rate I versus undercooling ΔT is calculated according to the classic nucleation theory [6]:…”

Section: Methodsmentioning

confidence: 99%

Direct nucleation and growth of peritectic phase induced by substantial undercooling condition

Zhai

Wei

2013

Materials Letters

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Section: Methodsmentioning

confidence: 99%

Direct nucleation and growth of peritectic phase induced by substantial undercooling condition

Zhai

Wei

2013

Materials Letters

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“…4, the intersection of the A380 compositional line with the existing equilibrium phase boundaries generates points 1, 2, 3, 4, and their corresponding temperatures are 505 °C, 535 °C, 570 °C and 593 °C, respectively. Previous studies [10] demonstrated that temperatures of phase change and transformation in DSC heating curves are higher than the corresponding temperatures of thermodynamic equilibrium phase change and transformation, while temperatures of phase change and transformation in DSC cooling curves are lower than those equilibrium temperatures. This observation seems consistent with the principle of thermodynamic theory of solidification and dissolution of crystal materials because of the existence of an undercooling or incubation period [11] .…”

Section: Analyses Of Dsc Curvesmentioning

confidence: 99%

“…The onset temperature of T2 is 521.4 °C and the temperature of trough T2 is 523.5 °C while the reaction temperatures of equations (11) and (10) are 522 °C and 525 °C, respectively. T2 reflects reactions (11) and (10). The onset temperatures of T3, T4 and T6 are 526.7 °C, 556.0 °C and 605.6 °C, respectively.…”

Section: Thermodynamic Analyses Of Phase Change and Transformation Inmentioning

confidence: 99%

Characterization and kinetic modeling of secondary phases in squeeze cast Al alloy A380 by DSC thermal analysis

Zhou

et al. 2017

China Foundry

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A l-Si-Cu alloys are increasingly used in various automotive applications in the consideration of less weight and less energy consumption versus ironbased alloys. Among the Al-Si-Cu casting alloys, A380 with a silicon content of 7.5-10wt.% is the most widely used one due to its excellent castability, moderately high strengths and low cost [1] . To produce A380-based components, high pressure die casting (HPDC) is usually employed as a primary manufacturing process because of its high production rate and dimensional accuracy and stability. Most components produced by HPDC have relatively thin cross sections with a predominant wall thickness of 5 mm. High-pressure die castings have relatively high gas porosity levels, particularly in an area Abstract: Thermal analyses on squeeze cast aluminum alloy A380 (SC A380) solidified under 90 MPa were carried out to study the microstructure development of the alloy, in which a differential scanning calorimeter (DSC) was employed. During the DSC runs, heating and cooling rates of 1, 3, 10, and 20 °C•min -1 were applied to investigate the heating and cooling effects on dissolution of secondary eutectic phases and microstructure evolution. Various reactions corresponding to troughs and peaks of the DSC curves were identified as corresponding to phase transformations taking place during dissolution or precipitation suggested by the principles of thermodynamics and kinetics. The comparison of the identified characteristic temperatures in the measured heating and cooling curves are generally in good agreement with the computed equilibrium temperatures. The microstructure analyses by scanning electron microscopy (SEM) with energy dispersive X-ray spectroscopy (EDS) indicate that the distribution and morphology of secondary phases present in the microstructure of the annealed sample are similar to the as-cast A380, i.e., strip β(Si), buck bone like or dot distributed θ(Al 2 Cu), β(Al 5 FeSi) and with relatively thick cross sections, owing primarily to the entrapment of air or gas in the melt during the high-speed injection of turbulent molten metal into the cavity. A recent study indicates that squeeze casting (SC), involving slow laminar filling and the solidification of a molten metal in a closed die under an applied pressure, is capable of eliminating gas and shrinkage porosity and consequently enhancing the tensile properties of A380 castings with very thick sections (25 mm) over the HPDC counterpart [2] . The improved soundness of squeeze cast A380 casting enables thermal treatment for further improvement of mechanical properties. Thus, an in-depth understanding of the kinetic features of the dissolution and precipitation of secondary intermetallic phases in squeeze cast A380 alloy is needed to establish correct thermal treatment processes and comprehend their effect on microstructure evolution.It has been demonstrated in previous studies [3] that the mechanical properties of cast A380 are related to the presence of secondary intermetallic phases and their

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“…To model the melting process of the preform, the heat equation with convective and conductive heat transfer is [20] solved, taking the enthalpy of fusion into account, which plays a crucial role in the energy balance during melting and solidification of brazing processes [12]. For each volume element, the temperature T is thus determined by applying the heat transfer equation (Eq.…”

Section: Model Geometry and Meshing For Evaluation Of Thermal Cycle Dmentioning

confidence: 99%

Experimental and numerical investigations regarding laser drop on demand jetting of Cu alloys

Stein

Dobler

Radel

et al. 2017

Prod. Eng. Res. Devel.

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model was set up, indicating heating and cooling rates of 22,100 K/s. Further, the impact of the capillary geometry on the velocity fields of a passing medium was evaluated. By changing the capillary geometry, the gas flow velocity could be reduced by about 10% according to the simulation model, which resulted in a reduction of droplet height deviation of 7.5% and a reduction of the droplet diameter deviation of 32.2% in the experiment.

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A DSC analysis of thermodynamic properties and solidification characteristics for binary Cu–Sn alloys

Cited by 65 publications

References 27 publications

Direct nucleation and growth of peritectic phase induced by substantial undercooling condition

Direct nucleation and growth of peritectic phase induced by substantial undercooling condition

Characterization and kinetic modeling of secondary phases in squeeze cast Al alloy A380 by DSC thermal analysis

Experimental and numerical investigations regarding laser drop on demand jetting of Cu alloys

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