Spray forming of hypereutectic Al–Si alloys

Cui, Chengsong; Schulz, A.; Schimanski, K.; Zoch, H.‐W.

doi:10.1016/j.jmatprotec.2009.03.009

Cited by 122 publications

(39 citation statements)

References 19 publications

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“…4) However, the application did not have great success due to the primary Si particles are coarse and uneven distributed in hypereutectic Al-Si alloy. To overcome such problems, various methods such as addition of nucleation agents 5,6) and rapid solidification 7,8) have been employed to refine the size of primary Si and the extent of macrosegregation. Alusil alloy (AlSi17Cu4Mg) with P refined can be used as engine block without liners.…”

Section: Introductionmentioning

confidence: 99%

Effects of Heat Treatment and Extrusion on Microstructure and Properties of A390 Alloy Hollow Billet Fabricated via DC Casting

Zuo¹,

Zhang²,

Qin³

et al. 2015

Mater. Trans.

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An A390 alloy hollow billet was fabricated via a DC casting process prior to heat treatment and extrusion. The microstructural evolution and properties of the A390 alloy were studied by means of optical microscopy, scanning electron microscopy (SEM), electrical conductivity, tensile and hardness tests. The results show that primary Si particles experienced a slight change in that the sharp edges and corners became smooth. The eutectic Si particles were partially modified, the morphology changed from needle-like to rod-like and granular and the particle size increased during homogenization and T6 heat treatment. Some coarse primary Si particles fractured with cracks inside or separated into smaller ones, while fine eutectic Si particles being uniformly distributed in the matrix with a more rounded morphology after the extrusion process. Intermetallic phases were still distributed at the grain boundary after homogenization and T6 heat treatment, while the extrusion process was successful in changing the distribution of intermetallic phases to be uniform in the matrix. The Al 8 FeMg 3 Si 6 (³) phase disappeared and it was substituted by the Al 5 Cu 2 Mg 8 Si 6 (Q) and ª phase during homogenization, and Fe was dissolved into the Q phase. The electrical conductivity increased after the heat treatment and extrusion process. The ultimate tensile strength (UTS) and hardness significantly increased after the T6 heat treatment as a result of precipitate hardening. The tensile strength and hardness value were reduced after the extrusion process and that can be ascribed to a small portion of primary Si particles being fractured with crack inside during the extrusion process. However, the elongation increased significantly after the extrusion process and it can be attributed to the microstructural evolution, especially the changes of eutectic Si improved the continuity of the matrix.

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Section: Introductionmentioning

confidence: 99%

Effects of Heat Treatment and Extrusion on Microstructure and Properties of A390 Alloy Hollow Billet Fabricated via DC Casting

Zuo¹,

Zhang²,

Qin³

et al. 2015

Mater. Trans.

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show abstract

“…The primary silicon particle size is found to decrease with increase in G/M ratio. From the calculation of the thermochemical data such as liquid fractions and enthalpies for the hyper-eutectic Al-Si alloys of various compositions, Cui et al (2009) demonstrated that the higher G/M ratios are required with increase in silicon content of the alloy to get refined microstructures.…”

Section: Introductionmentioning

confidence: 99%

Processing and dry sliding wear performance of spray deposited hyper-eutectic aluminum–silicon alloys

Raghukiran

Kumar

2013

Journal of Materials Processing Technology

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“…According to the binary phase diagram of Al-Si alloy [11], there is no reaction occurring at the aging temperatures, and the solubility of Si in the Al matrix is only about 1.59 at.% in the equilibrium state. However, in the asextruded Al-27Si alloy, the content of Si in the a-Al matrix is 15.06 at.%, due to the solute trapping in the rapid solidification process.…”

Section: Resultsmentioning

confidence: 99%

Microstructure and thermal expansion behavior of spray-formed Al–27Si alloy used for electronic packaging

Zhu

Wang

Peng

et al. 2014

J Mater Sci: Mater Electron

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The hypereutectic Al-27Si (mass fraction) alloys are prepared by spray deposition and extrusion. The effect of thermal aging process on the coefficient of thermal expansion (CTE) and microstructure of the Al-27Si alloys are investigated. The results show that the distribution of Si particles in a-Al matrix is uniform, and the primary Si phase grows gradually during the process of thermal aging. The CTE between room temperature to 100°C increases gradually with the ascending of aging temperature, attributed to the relaxation of residual thermal stress and the coarsening of primary Si phases in the alloys. On the other hand, the CTE increases linearly as the cycling temperature increases up to 500°C, and the measured values are in good agreement with the Kerner model.

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Spray forming of hypereutectic Al–Si alloys

Cited by 122 publications

References 19 publications

Effects of Heat Treatment and Extrusion on Microstructure and Properties of A390 Alloy Hollow Billet Fabricated via DC Casting

Effects of Heat Treatment and Extrusion on Microstructure and Properties of A390 Alloy Hollow Billet Fabricated via DC Casting

Processing and dry sliding wear performance of spray deposited hyper-eutectic aluminum–silicon alloys

Microstructure and thermal expansion behavior of spray-formed Al–27Si alloy used for electronic packaging

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