Modification of AlSi alloys with sodium

Qiyang, Liu; Li, Qingchun; Qifu, Liu

doi:10.1016/0956-7151(91)90064-8

Cited by 52 publications

(21 citation statements)

References 2 publications

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“…The problem of refining the undesirable morphology of silicon has been the subject of research interest over the years. The popularly used method to modify the eutectic silicon is by using one of the modifiers such as sodium (Qiyang et al, 1991), strontium (Dahle et al, 2001) and phosphorus (Song et al, 2009). On the other hand, silicon phase has also been successfully refined through unconventional processing routes such as powder metallurgy (Shen et al, 2001) and spray forming (Ojha et al, 1991).…”

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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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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“…Explanations of their effectiveness consider the influence of additives on Si nucleation and crystal growth. Among the latter, a distinction is made between kinetic effects caused by reduction of Si diffusion coefficients [46] and surface tension [47,48] in Sr-containing Al melts and blocking of Si lattice planes preferred in further crystal growth by local Na enrichment [49]. More recent studies by Srirangam et al confirm significant influence of Sr additions on the liquid state structure of Al-Si alloys seen in simulations using synchrotron radiation, thus supporting a role of the additive in nucleation of the Si phase [50].…”

Section: Grain Refinement and Modification Of Al-si Alloysmentioning

confidence: 99%

Effects of Eutectic Modification and Grain Refinement on Microstructure and Properties of PM AlSi7 Metallic Foams

Lehmhus

Hünert

Mosler

et al. 2019

Metals

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For AlSi7 foams, microstructure modification by variation of solidification rates and addition of Sr, B and TiB2/TiAl3 was investigated and its transfer to powder metallurgical metal foaming processes demonstrated. Microstructural characterization focused on grain size and morphology of the eutectic phase. Cooling rates during solidification were linked to secondary dendrite arm spacing, establishing a microstructure-based measure of solidification rates. Effects of refining and modification treatments were compared and their influence on foam expansion evaluated. Studies on foams focused on comparison of micro- and pore structure using metallographic techniques as well as computed tomography in combination with image analysis. Reference samples without additives and untreated as well as annealed TiH2 as foaming agent allowed evaluation of pore and microstructure impact on mechanical performance. Evaluation of expansion and pore structure revealed detrimental effects of Sr and B additions, limiting the evaluation of mechanical performance to the TiB2 samples. These, as well as the two reference series samples, were subjected to quasi-static compression testing. Stress-strain curves were gained and density-dependent expressions of ultimate compressive strength, plateau strength and tangent modulus derived. Weibull evaluation of density-normalized mechanical properties revealed a significant influence of grain size on the Weibull modulus at densities below 0.4 g/cm3.

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“…[14] When substituting the impact energy W CVN values by the strain energy density W values, Eq. [14] takes the form…”

Section: F Fracture Toughness and Strain Energy Densitymentioning

confidence: 99%

“…Later, Eq. [14] was used extensively for the quick estimation of the fracture toughness of the alloy from easy-to-perform mechanical tests, such as the tensile test and the impact test.…”

Section: Introductionmentioning

confidence: 99%

Relationship between Fracture Toughness and Tensile Properties of A357 Cast Aluminum Alloy

Alexopoulos

Tiryakioğlu

2009

Metall Mater Trans A

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The fracture-related mechanical properties of the A357 cast aluminum alloy, namely, elongation to fracture, tensile strain energy density (tensile toughness), strain-hardening exponent, and plane strain fracture toughness were investigated. Correlations between these properties have been established for 25 different artificial aging heat-treatment conditions and for five minor variations in chemical composition. Empirical relationships between the strain energy density and both the tensile elongation to fracture and the strain-hardening exponent have been developed. Analysis of the fracture surfaces indicated that the fracture mechanism of the investigated specimens varies according to the artificial aging conditions. Moreover, empirical relationships between the fracture toughness and strain energy density and between fracture toughness and strain-hardening exponent have been developed; these can be used to estimate the plane strain fracture toughness of A357 as a function of yield strength and tensile toughness.

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Modification of AlSi alloys with sodium

Cited by 52 publications

References 2 publications

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

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

Effects of Eutectic Modification and Grain Refinement on Microstructure and Properties of PM AlSi7 Metallic Foams

Relationship between Fracture Toughness and Tensile Properties of A357 Cast Aluminum Alloy

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