Microstructural characteristics and mechanical properties of peritectic Cu–Sn alloy solidified within ultrasonic field

Zhai, Wei; Hong, Zhenyu; Wen, Xiaoli; Geng, D. L.; Wei, B.

doi:10.1016/j.matdes.2015.02.017

Cited by 44 publications

(13 citation statements)

References 28 publications

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“…This implies that USMT can stifle the peritectic transformation δ-Al3FeSi2  β-Al5FeSi. However, contrasting results have also been reported on other alloy systems such as Sb-Sn [32], Cu-Sn [33] and Ti-Al [34], in which peritectic transformations were clearly promoted by USMT. This difference demands an in-depth investigation into the role of USMT on the peritectic transformation of primary Fe-containing intermetallics in hypereutectic Al-Si alloys.…”

Section: Introductionmentioning

confidence: 81%

“…In addition, USMT may have further enhanced the peritectic transformation by accelerating the peritectic transformation rate, in which case the thickness of the peritectic envelope ∆β-Al5FeSi in the alloy after USMT would be greater than that in the case without USMT. Previous studies [32][33][34] have suggested that the peritectic transformation rate increases markedly under USMT, possible due to two mechanisms: (1) acceleration of the liquid-peritectic phase interfacial diffusion due to cavitation and accompanied mixing of the melt; and, (2) increase in the peritectic reaction temperature according to the Clapeyron equation [54], and thus diffusion is expected to increase with temperature. To clarify this point, the β-Al5FeSi envelope thicknesses were measured for at least 40 particles in both alloys, and the results are shown in Table IV.…”

Section: B the Effect Of Usmt On Peritectic Transformation Of Intermmentioning

confidence: 99%

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The Effect of Ultrasonic Melt Treatment on Macro-Segregation and Peritectic Transformation in an Al-19Si-4Fe Alloy

Todaro

Easton

Qiu

et al. 2017

Metall Mater Trans A

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It is well documented that ultrasonic melt treatment (USMT) can refine dendritic and eutectic microstructures during solidification, but much less attention has been paid to the effect of USMT on macro-segregation and intermetallic transformations. In this research, macrosegregation and primary Fe-containing intermetallic peritectic transformations in an Al-19 wt pct Si-4 wt pct Fe alloy were investigated without and with USMT. Macrostructural examination showed that in the absence of USMT the ingot revealed considerable nonuniform distribution of both the primary Fe-containing intermetallic and primary Si particles, whereas the ingot with USMT exhibited near homogeneous distribution of both primary phases, i.e., reduced macro-segregation. The beneficial effect of USMT on relieving macrosegregation was further examined using quantitative microstructural metallography and the results indicated that the area fraction, number density, and size distribution of both primary phases became essentially uniform across the ingot after USMT. USMT further exerted a significant impact on the constitution of the primary Fe-containing intermetallics, where complex particles of δ-Al3FeSi2/β-Al5FeSi were prominent without USMT while few δ-Al3FeSi2 particles were observed after USMT and the primary Fe-containing intermetallics existed mostly as the single-phase β-Al5FeSi. The underlying reason was attributed to the

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Section: Introductionmentioning

confidence: 81%

Section: B the Effect Of Usmt On Peritectic Transformation Of Intermmentioning

confidence: 99%

The Effect of Ultrasonic Melt Treatment on Macro-Segregation and Peritectic Transformation in an Al-19Si-4Fe Alloy

Todaro

Easton

Qiu

et al. 2017

Metall Mater Trans A

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“…By applying ultrasonic vibration (or high-frequency vibration) during the deformation processes for the metallic materials, significant progress has been achieved in contrast with traditional processes [2]. In recent years, vibration assisted technology had fast developed and been well applied into micro extrusion [8,9], wire drawing [10,11], welding [12], and other related fields [13][14][15]. Nevertheless, the underlying mechanism of the effect on metal plasticity induced by ultrasonic vibration is still unclear and controversial; stress superposition, acoustic softening, and friction decrease are the three generally accepted explanations [16].…”

Section: Introductionmentioning

confidence: 99%

Acoustic softening and stress superposition in ultrasonic vibration assisted uniaxial tension of copper foil: Experiments and modeling

et al. 2016

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Ultrasonic vibration is widely utilized in manufacturing processes mainly because acoustic field could significantly affect the metal plasticity leading to stress reduction. However, viewpoints on the influence mechanism have not reached a consensus yet. In this paper, an ultrasonic vibration assisted uniaxial tension experiment with copper foils is carried out using a specially-developed device. The results show that the extent of stress reduction increases with the increase of the vibration amplitude. Acoustic softening and stress superposition are both considered in a developed model to describe the stress reduction due to ultrasonic excitation during metal forming process. Considering ultrasonic vibration provides the energy for dislocation sliding, acoustic softening is analyzed based on crystal plasticity theory considering ultrasonic intensity. Stress superposition, mostly induced by the additional periodic strain, is included by taking account of its proportional relationship with vibration amplitude. The calculation results from the numerical model show a good agreement with those from the experiment. These findings provide an instructive understanding of mechanism of stress reduction in ultrasonic vibration assisted metal deformation and is especially helpful for pro-actively designing ultrasonic vibration assisted metal forming processes.

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“…The mechanical properties of cast alloys can be enhanced by grain refinement or microstructure modification. In the past decades, various physical fields such as electric current pulse (ECP) [1][2][3][4][5][6], ultrasonic vibration [7][8][9][10] and electromagnetic stirring [11][12][13][14][15] have been applied during the solidification of alloys in order to refine the solidification structure. Recently, there has been much progress in ECP treatment, and much attention has been attracted to revealing the mechanism of ECP on grain refinement of alloys.…”

Section: Introductionmentioning

confidence: 99%

Research on Grain Refinement in Hypoeutectic Al-Si Alloy during Solidification under an Alternating Electric Current Pulse

Zhang

et al. 2019

Metals

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Experiments on transient directional solidification were carried out to study the columnar to equiaxed transition (CET) in Al-7Si alloy without and with an alternating electric current pulse (AECP). Without AECP, the macrostructure consists of typical columnar and equiaxed zones, separated by a near horizontal plane. As the AECP is applied during solidification, an additional fine equiaxed zone (FEZ) occurs in the as-cast macrostructure. From measured temperature profiles, cooling rate and temperature gradient are determined. It is found that CET occurs for a critical value of the cooling rate, which is observed to be about 0.14 K·s−1 in the present investigation. Furthermore, the macrostructural observation with mold for embedding the mesh plate demonstrates that the major factor responsible for the formation of fine equiaxed grains is the detachment of crystal nuclei from the upper contact surface and the lateral wall. The detachment is in turn ascribed to electric current-associated free energy change (ΔGe)-induced the driving force F.

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Microstructural characteristics and mechanical properties of peritectic Cu–Sn alloy solidified within ultrasonic field

Cited by 44 publications

References 28 publications

The Effect of Ultrasonic Melt Treatment on Macro-Segregation and Peritectic Transformation in an Al-19Si-4Fe Alloy

The Effect of Ultrasonic Melt Treatment on Macro-Segregation and Peritectic Transformation in an Al-19Si-4Fe Alloy

Acoustic softening and stress superposition in ultrasonic vibration assisted uniaxial tension of copper foil: Experiments and modeling

Research on Grain Refinement in Hypoeutectic Al-Si Alloy during Solidification under an Alternating Electric Current Pulse

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