The application of an analytical model to solve an inverse heat conduction problem: Transient solidification of a Sn-Sb peritectic solder alloy on distinct substrates

Curtulo, Joanisa P.; Dias, M.V.B.; Bertelli, Felipe; Silva, Bismarck Luiz; Spinelli, José Eduardo; Garcia, Amauri; Cheung, Noé

doi:10.1016/j.jmapro.2019.10.029

Cited by 13 publications

(5 citation statements)

References 32 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…It can be seen that Ṫ decreased with the progress of solidification from the cooled bottom of the casting due to two reasons: 1) The continuous growth from bottom to top of the casting increases progressively the thermal resistance of the solid layer; [ 32 ] 2) the thermal and volumetric shrinkage accompanying the solidification of the casting generates an increasing gap between the casting and the mold wall, thus inducing an interfacial thermal resistance that increases over time. [ 33,34 ] In previous studies, [ 35–39 ] the fishbone morphology was reported to be dependent on Ṫ and V and on the composition of the alloy. Particularly, high cooling rates and increase in a specific solute content promoted the formation of fishbone intermetallic particles.…”

Section: Resultsmentioning

confidence: 99%

Morphology of Intermetallics Tailoring Tensile Properties and Quality Index of a Eutectic Al–Si–Ni Alloy

2020

Self Cite

View full text Add to dashboard Cite

The Al-Si-Ni alloy system is a source of multicomponent piston alloys, which combine good castability and wear resistance of Al-Si alloys with great thermal stability and corrosion resistance of Al-Ni alloys. [1-3] The inherent high piston temperature during engine functioning is one of the limiting factors for the application of Al-Si-based alloys. [4] On the other hand, alloys containing Al-Ni-based intermetallic compounds (IMCs) are mainly used for high-temperature structural products, which also demand wear resistance, such as aircraft engines, turbine vanes, and guide vanes of industrial steam turbines. [5,6] The formation of Ni-rich IMCs occurs even for low Ni concentrations, [7] as Ni is almost insoluble in aluminum, with a solubility of about 0.05 wt% at 640 ºC and less than 0.005 wt% at 450 ºC. [8] Thus, the addition of Ni to Al─Si alloys can potentially improve their wear resistance at elevated temperatures. Once the second phases are responsible for these characteristics, the modification of the microstructure, regarding its refinement, usually improves the properties and extends the lifetime of the component. Apart from the formation of different IMCs, the addition of new alloying elements can promote modification of other phases, mainly on Si. Kaya and Aker [9] studied ternary Al-12.6 wt% Si-2 wt% X alloys, where X was Cu, Co, Ni, Sb, or Bi. They verified that the addition of Co promotes a better distribution of Si flakes (i.e., smallest interflake spacings) and, consequently, highest hardness and tensile strength are achieved. Although the addition of Cu induced the least efficient refinement effect, the Al-12.6 wt% Si-2 wt% Cu alloy showed the second highest tensile properties. This occurred probably due to the formation of a supersaturated solid solution and hard Al 2 Cu particles. As Al 2 Cu and Al 9 Co 2 have similar hardness (588 [10] and 568 HV, [11] respectively), and Co is restricted to the formation of Al 9 Co 2 , the refinement of Si seems to have a major effect on mechanical properties. The aforementioned alloying elements are not modifiers of the eutectic Si morphology, but they just decrease the interflake spacing. Sr is a strong modifier, which is capable of transforming the acicular Si in welldistributed fibers with only a few hundred parts per million. In an Al-10 wt% Si alloy, 240 ppm of Sr has the same effect as 520 ppm of Ti-B grain refiner in terms of tensile properties. [12] Another Si modifier, Sc, also decreases the secondary dendritic arm spacing and refines the grain size; however, it requires an amount 20 times greater than that of Sr to improve the mechanical properties at the same level. [13] In secondary aluminum, Mn, [14,15] Cr, [16,17] Ni, [18,19] and other alloying elements are added to suppress the precipitation of harmful β-AlFeSi, aiming at the formation of α-AlFeSi, which has a Chinese-script morphology. Even though modification is, in general, desirable, excessive addition can lead to overmodification. Riestra et al. [20] observed in Al-11 wt% Mg 2 Si alloys, in ...

show abstract

Section: Resultsmentioning

confidence: 99%

Morphology of Intermetallics Tailoring Tensile Properties and Quality Index of a Eutectic Al–Si–Ni Alloy

2020

Self Cite

View full text Add to dashboard Cite

show abstract

“…Although hardness can be considered an important characteristic for TIM applications, further tests involving other important properties are necessary such as tensile properties, [64] wettability of the alloy against different substrates, [65] and the corresponding thermal interface resistance. [66]…”

Section: Resultsmentioning

confidence: 99%

“…This gives an acceptable explanation of why although λ 1 and λ 2 are finer at regions closer to the cooled bottom of the Bi–20 wt% Sb alloy casting, the HV values are lower as compared with those of positions toward the top of the DS casting. Although hardness can be considered an important characteristic for TIM applications, further tests involving other important properties are necessary such as tensile properties, wettability of the alloy against different substrates, and the corresponding thermal interface resistance …”

Section: Resultsmentioning

confidence: 99%

Microstructure Growth Morphologies, Macrosegregation, and Microhardness in Bi–Sb Thermal Interface Alloys

et al. 2020

Self Cite

View full text Add to dashboard Cite

Due to the rising demand for thermal management technologies within the electronics industry, there has been an increased emphasis on developing new thermal interface materials (TIMs) with enhanced performance. Despite Bi‐based alloys having exhibited promising potential as TIMs in microelectronics cooling applications, understanding the microstructure evolution of these alloys and the consequent effects on the resulting properties still remains an essential task to be accomplished. Herein, a directional solidification technique is used to investigate microstructural features and Vickers microhardness of Bi(5–20) wt% Sb alloys with a focus on the roles of alloy composition, solidification thermal parameters, and macrosegregation. The results show the formation of aligned Bi‐rich dendrites in a broad range of cooling rates from about 0.2 to 25 °C s−1. In contrast, as the alloy Sb content increases, two morphological transitions in the Bi‐rich matrix are shown to occur as follows: trigonal pattern → irregular shape → trigonal pattern. Then, primary and secondary dendritic arm spacings are related to growth and cooling rates through experimental equations. Finally, the occurrence of macrosegregation along the length of the Bi–20 wt% Sb alloy casting is shown to be a key factor associated with the variation of microhardness.

show abstract

“…In this case, neither a more refined microstructure nor even a greater amount of hard particles (SnSb) generated enough cutting efforts for the machining heating rates of the Sn-5.5wt%Sb alloy to be higher than those of the Sn-2.0wt %Sb. The softening or melting of the material during the cutting process leads to the formation of a false edge, which, depending on the amount, takes on the cutting function, impairing the finish of the piece [41][42][43][44].…”

Section: Machinabilitymentioning

confidence: 99%

Influence of Solidification Parameters and Solute Content on the Machinability of Two Lead-Free Babbit Metals

Costa Maciel

2023

Current Trends in Eng Sc

View full text Add to dashboard Cite

Studies suggest that white metal Sn-Sb alloys are the most commonly type of babbit metal used in industry. However, it is necessary to evaluate manufacturing characteristics and solute contents that leads the best machining conditions. This work presents a correlation between solidification parameters and machinability of Sn-2.0wt%Sb and Sn-5.5wt%Sb alloys, solidified in a horizontal directional device, evaluating the influence of solute content on these results. Cutting temperatures were measured in dry necking processes along the length of the ingot. It was observed that the reverse cellular-dendritic transition influenced the cutting temperature results. The range of cell and dendrite spacings varies approximately from 40 to 330 μm on the Sn-2.0wt%Sb alloy and from 15 to 240 μm on the Sn-5,5wt%Sb alloy. In the cellular region, higher values are found for the Sn-5.5wt%Sb alloy, but in the dendritic region, these values were higher for the Sn-2.0wt%Sb alloy.

show abstract

The application of an analytical model to solve an inverse heat conduction problem: Transient solidification of a Sn-Sb peritectic solder alloy on distinct substrates

Cited by 13 publications

References 32 publications

Morphology of Intermetallics Tailoring Tensile Properties and Quality Index of a Eutectic Al–Si–Ni Alloy

Morphology of Intermetallics Tailoring Tensile Properties and Quality Index of a Eutectic Al–Si–Ni Alloy

Microstructure Growth Morphologies, Macrosegregation, and Microhardness in Bi–Sb Thermal Interface Alloys

Influence of Solidification Parameters and Solute Content on the Machinability of Two Lead-Free Babbit Metals

Contact Info

Product

Resources

About