Effects of Grain Boundary Sliding on Microstructural Evolution and Damage                 Accumulation in Tin-Lead Alloy

Shen, Yansong; Abell, K. C. R.; Garrett, Stephen E.

doi:10.1177/1056789504042594

Cited by 14 publications

(2 citation statements)

References 24 publications

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“…According to the phase diagram of Sn-Pb alloy [27], the liquid %67wt Sn-%33wt Pb alloy after solidification consists of primary β (Sn-rich) phase and a eutectic mixture consisted of nearly pure lead (α) and nearly pure tin (β) (as it is shown in figure 7(a)). α and β phases are observed as dark and light layers, respectively [28].…”

Section: Resultsmentioning

confidence: 99%

Investigation into microstructure and mechanical behaviors of joints made by friction stir vibration brazing between low carbon steels

2021

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In the current investigation, a new version of brazing entitled FSVB (friction stir vibration brazing) is developed. In this process, the adjoining samples are vibrated normally to the brazing line while FSB is performed. Low carbon steel sheets are lap joined together using FSB and FSVB methods while SiO2 nanoparticles are incorporated in the joint. The microstructure and mechanical behaviors of the joints developed under different conditions are analyzed. %67wt Sn-%33wt Pb alloy is used as braze metal. The results show that the strength of the FSV brazed specimen is higher than that of the FS brazed sample (about 30%); additionally, the presence of SiO2 nanoparticles increases the strength of joints made by FSVB. Second-phase particles reduce the mobility of dislocations and strengthen the braze material. The vibration of adjoining specimens, during FSVB, increases the stirring of the molten braze metal between the adjoining specimens and the molten fills the space thoroughly. Workpiece vibration during FSVB also leads to the production of higher heat and temperature compared to those when using FSB. The higher temperature results in a higher fluidity of molten and it enhances the homogeneity of second-phase particle distribution and as a result, the joint strength increases. The results show that the strength and hardness of FSV brazed samples increase by 16% and 18%, respectively, and the thickness of the intermetallic component decreases as vibration frequency increases from 20 Hz to 50 Hz.

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Section: Resultsmentioning

confidence: 99%

Investigation into microstructure and mechanical behaviors of joints made by friction stir vibration brazing between low carbon steels

2021

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“…We have experimental evidence that grain boundary 'wetting' in the solid state during severe plastic deformation takes place. This phenomenon can be called a grain boundary phase transition, which has been observed in [20,21] in other binary systems at high temperature.…”

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confidence: 88%

The Role of Diffusion Accommodation and Phase Boundary Wetting in the Deformation Behaviour of Ultrafine Grained Sn-Pb Eutectic

Muktepavela

Zabels

2010

DDF

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Mechanical properties, microstructure of the Sn–38wt. %Pb eutectic and the development of deformation - induced diffusion processes on interphase boundaries (IB) were investigated. Experiments were carried out both in deformed and annealed states of eutectic using micro- and nanoindentation, SEM, AFM and optical microscopy techniques. It was found that the deformation of the annealed alloy is localized at the Pb/Sn interphase boundaries and occurs by grain boundary sliding (GBS) accompanied by sintering micropore processes under the action of the capillary forces on the Pb/Sn IB. During severe plastic deformation of Sn-Pb eutectic phase transition in the Sn grain boundary occurs. This deformation-induced process takes place due to the wetting of tin with Pb. These diffusion accommodation processes (sintering and wetting) are facilitated by the low values of the Pb/Sn interphase energy (0.07 J/m2). Wetting is thermodynamically favourable because the condition γgb > 2 γib is satisfied and it is also kinetically allowed due to the relatively high homologous temperature (> 0.5•Tm). The obtained values of the nanohardness and elastic modulus evidence that the IBs in the Sn–Pb eutectic have to be considered as a separate quasi-phase with its own properties.

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Electronic Packaging Structures

Shen¹

2010

Constrained Deformation of Materials

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Effects of Grain Boundary Sliding on Microstructural Evolution and Damage Accumulation in Tin-Lead Alloy

Cited by 14 publications

References 24 publications

Investigation into microstructure and mechanical behaviors of joints made by friction stir vibration brazing between low carbon steels

Investigation into microstructure and mechanical behaviors of joints made by friction stir vibration brazing between low carbon steels

The Role of Diffusion Accommodation and Phase Boundary Wetting in the Deformation Behaviour of Ultrafine Grained Sn-Pb Eutectic

Electronic Packaging Structures

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