Grain refinement of primary silicon in hypereutectic Al-Si alloys by different P-containing compounds

Njuguna, Benson Kihono; Li, Jiayan; Tan, Yi; Sun, Qianqian; Li, Peng-ting

doi:10.1007/s41230-021-0074-2

Cited by 15 publications

(10 citation statements)

References 19 publications

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“…In previous studies, AlP can be used as the nucleation core of primary silicon [ 10 , 11 , 24 ], and TiB 2 can be coupled with AlP as the nucleation core of primary silicon through peritectic coupling [ 19 ]. However, TiB 2 particles which was observed to nucleate diphasically with AlP particles in the primary silicon core, was coated with Al phase in this work.…”

Section: Resultsmentioning

confidence: 99%

“…The schematic description of the duplex nucleation mechanism of AlP and TiB 2 in the near-eutectic Al-Si alloy is shown in Figure 9 . First of all, AlP nucleates on the surface of TiB 2 particles, Si element aggregates near AlP particles and primary silicon begins to form [ 11 ]. Al phase nucleates and grows on TiB 2 particles [ 25 , 26 ], the content of Al element around the particles’ changes, and the eutectic component is reached in a small area.…”

Section: Resultsmentioning

confidence: 99%

“…The grain refinement is closely related to the two factors mentioned above. AlP can be used as the heterogeneous nuclei of primary silicon [ 10 , 11 , 12 ], as well as Al-Ti-B/Al-Ti-C intermediate alloys were often used to refine aluminum dendrites. Xiangfa Liu et al reported an Al-2Ti-0.5B-0.5C intermediate alloy [ 13 ], which has a better refinement effect on silicon containing hypoeutectic aluminum alloy.…”

Section: Introductionmentioning

confidence: 99%

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Duplex Nucleation and Its Effect on the Grain Size and Properties of Near Eutectic Al-Si Alloys

et al. 2022

Materials

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Duplex nucleation and its effect on the grain size and properties of near eutectic Al-Si alloys were investigated in this work. It is found that the grain size of Al-13Si-1Cu alloy can be greatly refined by addition of Al-2Ti-0.5B-0.5C and Al-P master alloys, and TiB2/AlP duplex nucleation was observed at the nuclei of primary silicon in the process of studying the refinement mechanism. TiB2 phase coated by Al co-existed with AlP in the nuclei of primary Si. The existence of Al phase should not only guarantee the promotion of TiB2 particles on the nucleation of AlP particles, but also made TiB2 particle stable in the core of primary silicon through the interaction with the Si phase. Duplex nucleation can not only affect the grain size of Al-Si alloy, but also effect of the distribution of strengthening phases in Al-Si alloy and improve the properties. Compared with single Al-P master alloy treatment, the tensile strength of Al-12Si-4Cu-2Ni-1Mg alloy after duplex nucleation treatment are improved obviously. The fatigue performance of Al-12Si-4Cu-2Ni-1Mg alloy is also improved significantly by the duplex nucleation.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Duplex Nucleation and Its Effect on the Grain Size and Properties of Near Eutectic Al-Si Alloys

et al. 2022

Materials

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“…Furthermore, addition of Si also leads to grain refinement of the primary BCC solid solution. Grain refinement strengthening is the main strengthening mechanism in most alloys [40][41] . Therefore, grain refinement by addition of Si can also improve the strength of NbMoTiVWSi x high-entropy alloys.…”

Section: Strengthening Mechanism Of Alloysmentioning

confidence: 99%

Microstructure characteristics and mechanical properties of NbMoTiVWSix refractory high-entropy alloys

Wang

Chen

et al. 2022

China Foundry

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Refractory high-entropy alloys are considered as potential structural materials for elevated temperature applications. To obtain refractory high-entropy alloys with high strength, different amounts of Si were added into the NbMoTiVW refractory high-entropy alloys. The effects of Si on the phase constitution, microstructure characteristics and mechanical properties of NbMoTiVWSi x alloys were investigated. Results show that when the addition of Si is 0, 0.025 and 0.05 (molar ratio), the alloys are consisted of primary BCC and secondary BCC in the intergranular area. When the addition of Si is increased to 0.075 and 0.1, eutectic structure including silicide phase and secondary BCC phase is formed. The primary BCC phase shows dendritic morphology, and is refined by adding Si. The volume fraction of intergranular area is increased from 12.22% to 18.13% when the addition of Si increases from 0 to 0.1. The ultimate compressive strength of the NbMoTiVW alloy is improved from 2,242 MPa to 2,532 MPa. Its yield strength is also improved by the addition of Si, and the yield strength of NbMoTiVWSi 0.1 reaches maximum of 2,298 MPa. However, the fracture strain of the alloy is decreased from 15.31% to 12.02%. The fracture mechanism of the alloys is changed from mixed fracture of ductile and quasi-cleavage to cleavage fracture with increasing of Si. The strengthening of alloys is attributed to the refinement of primary BCC phase, volume fraction increment of secondary BCC phase, and formation of eutectic structure by addition of Si.

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“…Several routes, such as chemical modification, solution heat treatment, and deformation, have been used to attain a fine ideal microstructure and to modify the morphology of the Si particles [ 7 , 8 , 9 , 10 , 11 , 12 , 13 , 14 , 15 , 16 , 17 , 18 , 19 ]. The chemical modification and heat treatment methods are constrained by economy, resources, and environment.…”

Section: Introductionmentioning

confidence: 99%

Influence of Modification on Flow Stress Behavior and Corrosive Properties of a Hypoeutectic Al-Si Alloy

Song

Huang³

et al. 2022

Materials

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The flow stress behavior and corrosive properties of Al-7Si alloy were studied by thermal compression test, electrochemical test, and electron probe microanalysis. The influences of temperatures, strain rates, strains, and morphology of Si particles on stress-strain curves of Al-7Si alloy were analyzed. The peak stress of unmodified-Al-7Si alloy is higher than that of Sr-modified-Al-7Si alloy at the same deformation conditions, and the phenomenon is obviously relevant to the distribution and morphology of Si particles. The morphology of Si particles of unmodified-undeformed-Al-7Si alloy is a typical thick layer, and that of unmodified-deformed-Al-7Si alloy is broken into relatively small particles and the distribution is relatively even in homogeneous deformation zone II. The distribution of Si particles in Sr-modified-deformed-Al-7Si alloy is obviously more even than undeformed alloy. The effect of a small deformation of 20% on the distribution and morphology of Si particles is obviously smaller than that of a large deformation of 50%. The electrochemical self-corrosion potential of Sr-modified-Al-7Si alloy is higher than that of unmodified-Al-7Si alloy, and it proves that the distribution and morphology of Si particles have a certain influence on the corrosive properties of Al-7Si alloy. That is, the even fine Si particles are more conducive to improving the corrosive properties of Al-7Si alloy.

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Grain refinement of primary silicon in hypereutectic Al-Si alloys by different P-containing compounds

Cited by 15 publications

References 19 publications

Duplex Nucleation and Its Effect on the Grain Size and Properties of Near Eutectic Al-Si Alloys

Duplex Nucleation and Its Effect on the Grain Size and Properties of Near Eutectic Al-Si Alloys

Microstructure characteristics and mechanical properties of NbMoTiVWSix refractory high-entropy alloys

Influence of Modification on Flow Stress Behavior and Corrosive Properties of a Hypoeutectic Al-Si Alloy

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