Microstructure studies in Al-6% Si-1.9% Cu-x% Mg alloys

Zafar, Saba; Ikram, N.; Shaikh, M.A.; Shoaib, K. A.

doi:10.1007/bf00638064

Cited by 15 publications

(12 citation statements)

References 5 publications

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“…[20,21,23] In addition to the precipitation of the Q phases, several others, such as h-Al 2 Cu, b-Mg 2 Si, S-Al 2 CuMg, r-Al 5 Cu 6 Mg 2 , and their precursors, are also expected to precipitate during age-hardening treatment of these alloys. [21,28,[32][33][34][35][36] Figure 1 shows the effects of aging temperature and time on the tensile properties of 354-type castings, namely, UTS, YS, and percentage elongation to fracture (E f ). This diagram shows that aging at 428 K (155°C) results in a continuous increase in strength with an increase in the aging time of up to 72 hours at which point the maximum strength is obtained; peak aging, however, is expected to be attained upon extending the aging time beyond 72 hours.…”

Section: Resultsmentioning

confidence: 99%

Influence of Aging Parameters on the Tensile Properties and Quality Index of Al-9 Pct Si-1.8 Pct Cu-0.5 Pct Mg 354-Type Casting Alloys

Ammar

Samuel

et al. 2011

Metall Mater Trans A

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The current study was carried out with a view to investigating the influence of age-hardening parameters, aging temperature and time, on the tensile properties and quality indices of a highstrength Al-9 pct Si casting alloy, namely, 354-Al-9 pct Si-1.8 pct Cu-0.5 pct Mg. Quality charts were used as an evaluation tool for selecting the optimum conditions to be applied, in practice, in order to develop high strength and optimum quality in 354 casting alloy. Aging at a low temperature of 428 K (155°C) was observed to produce the greatest strength and optimum quality in the 354-type castings compared to aging at higher temperatures. The peak strength observed for 354 alloy may be attained after shorter aging times on the condition that the aging temperature is increased. The aging times required for reaching peak strength in 354 alloys are 72 hours, 40 hours, 8 hours, 1 hour, and 15 minutes at aging temperatures of 428 K, 443 K, 468 K, 493 K, and 518 K (155°C, 170°C, 195°C, 220°C, and 245°C), respectively. Aging treatment at higher temperatures is accompanied by a reduction in the tensile properties and quality index values of the castings; however, it also introduces the possibility of a significant economical strategy for minimizing the time and the cost of this same treatment. Aging treatment at a lower temperature of 428 K (155°C) produces fine and dense precipitates displaying smaller interparticle spacing, while at higher aging temperatures, such as 518 K (245°C), the precipitates are coarser in size, less dense, and more widely dispersed. The quality charts developed in the course of the current research facilitate the interpretation and evaluation of the tensile properties of the 354 alloy. Such charts provide a logical evaluation tool, from the metallurgical point of view, for an accurate prediction of the influence of aging parameters studied on the properties of the alloys. Depending on the required level of tensile properties and based on the quality charts developed, it is possible to make a rigorous selection as to the most suitable aging parameters to be applied to the 354 alloy so as to obtain the best possible costeffective compromise between alloy strength and quality.

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Section: Resultsmentioning

confidence: 99%

Influence of Aging Parameters on the Tensile Properties and Quality Index of Al-9 Pct Si-1.8 Pct Cu-0.5 Pct Mg 354-Type Casting Alloys

Ammar

Samuel

et al. 2011

Metall Mater Trans A

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“…As Kang et al [5] reported, the hV phase preferentially precipitates on the dislocations introduced around eutectic Si particles in the Al -Si -Cu base alloys; while the EV (Al 5 Cu 2 Mg 8 Si 5 ) phase homogeneously precipitates in the a matrix, regardless of the sites of dislocations, and therefore significantly raises the age-hardening ability. The Q(Al 5 Cu 2 Mg 8 Si 6 ) phase may exist in the aged Al -Si -Cu -Mg alloys, which can be responsible for the age-hardening as suggested by Zafar et al [6].…”

Section: Introductionmentioning

confidence: 90%

“…However, there are little published data describing those double aging peaks phenomena of AlSi -Cu -Mg cast alloy [2,5,6]. Therefore, the age-hardening behavior of Al -Si base alloys has been investigated on the cast Al -Si -Cu, Al -Si-Mg and Al -Si-Cu -Mg alloys by means of hardness and tensile properties tests, differential scanning calorimetry (DSC) analysis, TEM and HRTEM observation.…”

Section: Introductionmentioning

confidence: 99%

Age-hardening behavior of cast Al–Si base alloy

Zhao

et al. 2004

Materials Letters

214

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“…In general, the addition of any alloying elements into Al reduces the electrical conductivity. Hence, increasing the Cu content, it is expected that a corresponding decrease in electrical conductivity will occur as more solute atoms go into solid solution [36][37][38][39]. Cu0's EC response appears in contrast to the tendency predicted.…”

Section: Microstructural Investigationmentioning

confidence: 99%

How Slight Solidification Rate Variations within Cast Plate Affect Mechanical Response: A Study on As‐Cast A356 Alloy with Cu Additions

Giovanni

Cerri

Saito

et al. 2018

Advances in Materials Science and Engineering

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e present work investigates a narrow range of secondary dendrite arm spacing (SDAS), in an as-cast A356 alloy with and without copper (Cu) additions. Cu was added to the base A356 alloy melt to reach the target concentration of 0.5 and 1 wt.%. Samples were selected from 3 different positions within the cast plate, offering 30, 35, and 40 μm SDAS variants. Tensile curves revealed a strong influence between the specimen cutting position and strength, with a pronounced effect in the Cu-containing alloys. Hardness measurements did not confirm the tensile response; hence, to understand the phenomenon, microstructural features have been investigated in detail. Eutectic silicon (Si) particle equivalent diameter (ED) size decreased from the top (T) to the bottom (B) position of the cast. Eutectic Si particle surface area (A%) was found to be denser at the B as compared to the T and simultaneously in the Cu-containing alloy as compared to the Cu-free reference alloy. Backscattered electron (BSE) images were employed to investigate the nature of the Cu-rich intermetallic phases. In conclusion, electrical conductivity measurements were performed to confirm the trends observed.

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Microstructure studies in Al-6% Si-1.9% Cu-x% Mg alloys

Cited by 15 publications

References 5 publications

Influence of Aging Parameters on the Tensile Properties and Quality Index of Al-9 Pct Si-1.8 Pct Cu-0.5 Pct Mg 354-Type Casting Alloys

Influence of Aging Parameters on the Tensile Properties and Quality Index of Al-9 Pct Si-1.8 Pct Cu-0.5 Pct Mg 354-Type Casting Alloys

Age-hardening behavior of cast Al–Si base alloy

How Slight Solidification Rate Variations within Cast Plate Affect Mechanical Response: A Study on As‐Cast A356 Alloy with Cu Additions

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