Inter-relation of Microstructural Features and Dry Sliding Wear Behavior of Monotectic Al–Bi and Al–Pb Alloys

Freitas, Emmanuelle S.; Silva, Adrina P.; Spinelli, José Eduardo; Casteletti, Luíz Carlos; Garcia, Amauri

doi:10.1007/s11249-014-0338-8

Cited by 32 publications

(16 citation statements)

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“…The solidification experiments were achieve under non-stead state conditions of heat flow with a large amplitude of cooling rates, which allows a variation on the dendritic morphology. The results obtained by Freitas et al 13 , show that interphase spacing and the morphology of the minority phase have a strong effect on the wear process. Spinelli et al 12 proposed a theoretical and experimental work to investigate the thermal parameters during solidification process of binary Sn-Pb alloys.…”

Section: Introductionmentioning

confidence: 94%

“…The solidification thermal parameters have influence on the microstructure and microsegregation andthese, in turn, are key featuresin inducing non-uniformity on the as-cast material mechanical properties. For this reason, the microstructure and microsegregation has been extensively studied both theoretically [1][2][3][4][5][6][7][8][9][10][11] and experimentally [12][13][14][15][16][17][18][19][20][21][22][23][24][25] for the last decades. The Al-1.2wt%Pb and Al-3.2wt%Bi alloys have been chosen by Freitas et al 13 , to study the effect of microstructural parameters on the wear process.…”

Section: Introductionmentioning

confidence: 99%

“…where C S is the concentration in the solid region, C 0 the initial overall composition and F S the solid fraction. Although the influence of solidification speed (V L ) and cooling rate ( ) on the microstructural characteristics was the focus of many studies [1][2][3][4][12][13][14][15][16] , literature on the influence of these parameters on the microsegregation profiles are still quite limited 21 . Burton et al 9 proposed an equation for effective distribution coefficient (K ef ) as a function of the solidification speed (V L ).…”

Section: Introductionmentioning

confidence: 99%

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Experimental Investigation of Ternary Al-Si-Cu Alloy Solidified with Unsteady-State Heat Flow Conditions

et al. 2018

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Ternary Al-9.0wt%Si-4.0wt%Cu alloy was solidified in a vertical directional solidification system under unsteady-state heat flow conditions. The resulting dendritic morphology and microsegregation were investigated. A more detailed analysis was dedicated to the microsegregation phenomena where a multielement interaction was observed. The solidification parameters such as: solidification speed (V L ) and cooling rate ( ) were determined from the cooling curves obtained during the solidification process. The thermal variables effect on the dendritic morphology is presented. The measurements of tertiary dendrite arm spacing (λ 3 ) and microsegregation were performed for different positions along the casting. The experimental curves for microsegregation were obtained for Si and Cu from the center of dendritic tertiary arm to the next nearest tertiary arm. The solidification speed (V L ) influence is "built into" the effective partition coefficient (K ef_Cu and K ef_Si ) that has been determined for the range of V L and microsegregation curves are calculated by Scheil's equation for comparison with experimental data. Good agreements of the Scheil's equation with experimental data on microsegregation curves of the Si and Cuwere obtained when effective partition coefficient (K ef_Cu and K ef_Si ) is taken into consideration. The multielement interaction effect on the Si microsegregation is investigated. Experimental results show that, Cu-rich dendrites were accompanied by minute amounts of Si. The concentration profiles obtained experimentally point to a strong negative correlation between Si and V L on ternary Al-9.0wt%Si-4.0wt%Cu alloy.

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Section: Introductionmentioning

confidence: 94%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Experimental Investigation of Ternary Al-Si-Cu Alloy Solidified with Unsteady-State Heat Flow Conditions

et al. 2018

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“…for Al–Sn(Cu–Si) alloys, and Freitas et al. for Al–In and Al–Pb alloys . In these studies, the higher wear resistance was associated with the higher amount and larger size of soft phases in the Al‐matrix, i.e., coarser structures have shown better wear response.…”

Section: Resultsmentioning

confidence: 89%

“…with Al–Sn–(Cu–Si), and Rodrigues et al. with Al–Cu–Ni alloys, correlations between disc wear‐volume loss ( V ), λ 2 , and CGD for the as‐cast and heat‐treated conditions, respectively, are shown in Figure for 100, 500, and 1000 m sliding distances . The points represent the experimental results and the dashed lines refer to curve fitting to the experimental points.…”

Section: Resultsmentioning

confidence: 97%

Dendritic Spacing/Columnar Grain Diameter of Al–2Mg–Zn Alloys Affecting Hardness, Tensile Properties, and Dry Sliding Wear in the As‐Cast/Heat‐Treated Conditions

et al. 2020

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Inter‐relations of solidification conditions, as‐cast and heat‐treated structures, and mechanical properties are extremely useful in the design of components, especially Al‐based alloys. Herein, the effects of secondary dendrite arm spacing (λ2) and columnar grain diameter (CGD) on hardness, tensile, and dry sliding wear responses of Al−2Mg‐(5 and 8)Zn (wt%) alloys in the as‐cast and heat‐treated conditions, respectively, are focused upon. The alloys are melted and solidified in an instrumented upward directional solidification apparatus under nonsteady‐state heat transfer conditions. Samples are cut from the solidified ingots and subjected to the T6 heat treatment. Samples are characterized metallographically by optical and scanning electron microscopies and mechanically by Brinell hardness, tensile, and dry sliding wear tests. It is found that higher Zn concentration and solidification cooling rates refine λ2 and the CGD. Hardness and tensile properties are improved with the decrease in λ2 in the as‐cast condition of both alloys. After heat treatment, all these properties increase with the decrease in CGD. Wear parameters show that only the alloy having a higher Zn content is associated with better wear resistance. Correlations between the wear rate as a function of λ2 and CGD are established by experimental equations.

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

et al. 2020

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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.

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Inter-relation of Microstructural Features and Dry Sliding Wear Behavior of Monotectic Al–Bi and Al–Pb Alloys

Cited by 32 publications

References 32 publications

Experimental Investigation of Ternary Al-Si-Cu Alloy Solidified with Unsteady-State Heat Flow Conditions

Experimental Investigation of Ternary Al-Si-Cu Alloy Solidified with Unsteady-State Heat Flow Conditions

Dendritic Spacing/Columnar Grain Diameter of Al–2Mg–Zn Alloys Affecting Hardness, Tensile Properties, and Dry Sliding Wear in the As‐Cast/Heat‐Treated Conditions

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

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