Grain refinement of aluminum casting alloy by heterogeneous nucleation sites with smaller lattice disregistry

Watanabe, Yoshihiko; Sato, Hisashi

doi:10.2464/jilm.64.157

Cited by 12 publications

(5 citation statements)

References 19 publications

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“…25) This value is smaller than that for platelet shaped Al 3 Ti. Therefore, it should be also noted that the process of RCMP method has merit in grain refinement of the Al matrix, as the grain shaped Al 3 Ti can be obtained.…”

Section: The Origin Of the Grain Refinementmentioning

confidence: 43%

“…23,24) In our previous study, the aspect ratio, defined as the ratio of platelet thickness to diameter, of Al 3 Ti platelet in Al-5 mass%Ti alloy is found to be 0.08. 25) If the Al 3 Ti platelet within the Al-Ti alloy has a facet structure as shown in Fig. 10(a), area ratio of {100} type surface: (001) type surface: {110} type surface becomes 8 ffiffi ffi 2 p : 137 : 10.…”

Section: The Origin Of the Grain Refinementmentioning

confidence: 99%

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Grain Refinement of Al<sub>3</sub>Ti Dispersed Aluminum Matrix Composites by Reaction Centrifugal Mixed-Powder Method

et al. 2015

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Aluminum matrix composites having dispersoids of Al 3 Ti intermetallic compounds can be obtained by reaction centrifugal mixed-powder (RCMP) method. It is reported that Al 3 Ti intermetallic compounds act as grain refiners, since the disregistry value between Al 3 Ti intermetallic compound phase and Al matrix is smaller than 10%. In terms of lattice registry between Al matrix and Al 3 Ti phase, it is expected that the grain structure of Al matrix in Al-Al 3 Ti composites becomes more refined than that of centrifugally cast pure Al. In this study, Al-Al 3 Ti composites have been cast by the RCMP method. Effects of the Al 3 Ti phases around Ti particles formed by reaction between Al and Ti particles during RCMP method on grain refinement behavior of Al matrix have been systematically investigated. Moreover, grain refining performance of Al cast by Al-Ti refiner with grain shaped Ti particles was also studied.

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Section: The Origin Of the Grain Refinementmentioning

confidence: 43%

Section: The Origin Of the Grain Refinementmentioning

confidence: 99%

Grain Refinement of Al<sub>3</sub>Ti Dispersed Aluminum Matrix Composites by Reaction Centrifugal Mixed-Powder Method

et al. 2015

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“…However, the average disregistry value for the platelet with an aspect ratio of 0.08 can be estimated to be 4.8%, since the aspect ratio of the Al-5 mass% Ti alloy is reported to be 0.08. 28) This value is close to 5%, beyond which the interface could not have a coherent structure.…”

Section: Concept Of Novel Refinermentioning

confidence: 71%

Fabrication of novel Al–L1₂-type Al_2.7Fe_0.3Ti refiners by spark plasma sintering and their refining performance

Watanabe¹,

Hamada²,

Sato³

2015

Jpn. J. Appl. Phys.

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Grain refinement plays a vital role in cast and wrought aluminum alloys. The grain refiners introduce particles that heterogeneously nucleate the primary alpha-aluminum. It is well known that Al3Ti particles are commonly used as heterogeneous nucleants for aluminum alloy casting. If a substance with a smaller misfit for aluminum is used as a heterogeneous nucleant, such as L12 intermetallic compounds, it should be possible to achieve a better grain refining performance. In this study, the optimum condition for a grain refiner using Al2.7Fe0.3Ti intermetallic compound particles with the L12 structure was investigated.

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“…The specimen with Al 3 Ti particles dispersed in the Cu matrix (Cu-10 vol % Al 3 Ti specimen) was fabricated similarly to the Al-10 vol % Al 2.5 Cu 0.5 Ti refiner 21) and Al-10 vol % Al 2.7 -Fe 0.3 Ti refiner 22,23) reported in previous studies. Two types of Al 3 Ti particles are used.…”

Section: Specimen With Al 3 Ti Particles Dispersed In Cu Matrixmentioning

confidence: 99%

“…[15][16][17][18][19][20] Moreover, by changing the replacing element, the lattice constant of L1 2 phases is controllable. In our previous studies, the effects of L1 2 modified intermetallic compound particles, such as Al 2.5 -Cu 0.5 Ti 21) and Al 2.7 Fe 0.3 Ti, 22,23) on the grain refining performance of an Al cast were studied. It has been shown that L1 2 modified intermetallic compound particles act as heterogeneous nucleation sites of α-Al solidification.…”

Section: Introductionmentioning

confidence: 99%

Formation of L1₂modified Al_2.5Cu_0.5Ti phase by heat treatment of spark-plasma-sintered Cu/Al₃Ti specimens

Watanabe

Hirata

Sato

2017

Jpn. J. Appl. Phys.

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In our previous studies, the influence of L1 2 modified Al 2.5 Cu 0.5 Ti and Al 2.7 Fe 0.3 Ti particles on the grain refining performance of an Al cast was studied. It has been shown that the L1 2 modified intermetallic compound particles act as heterogeneous nucleation sites of α-Al solidification. Since nuclei are formed on the surface of the heterogeneous nucleation site particles, only the surface region of the Al 3 Ti particles must be modified into an L1 2 structure. In this study, therefore, the formation of the Al 2.5 Cu 0.5 Ti phase by the reaction between Al 3 Ti and Cu is studied. For this purpose, Cu/Al 3 Ti diffusion couple specimens and specimens of Al 3 Ti particles dispersed in a Cu matrix are fabricated by a spark plasma sintering (SPS) method, and the reaction between Cu and Al 3 Ti during heat treatment of these specimens is studied. It is found that the L1 2 modified Al 2.5 Cu 0.

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Grain refinement of aluminum casting alloy by heterogeneous nucleation sites with smaller lattice disregistry

Cited by 12 publications

References 19 publications

Grain Refinement of Al<sub>3</sub>Ti Dispersed Aluminum Matrix Composites by Reaction Centrifugal Mixed-Powder Method

Grain Refinement of Al<sub>3</sub>Ti Dispersed Aluminum Matrix Composites by Reaction Centrifugal Mixed-Powder Method

Fabrication of novel Al–L1₂-type Al_2.7Fe_0.3Ti refiners by spark plasma sintering and their refining performance

Formation of L1₂modified Al_2.5Cu_0.5Ti phase by heat treatment of spark-plasma-sintered Cu/Al₃Ti specimens

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Grain refinement of aluminum casting alloy by heterogeneous nucleation sites with smaller lattice disregistry

Cited by 12 publications

References 19 publications

Grain Refinement of Al<sub>3</sub>Ti Dispersed Aluminum Matrix Composites by Reaction Centrifugal Mixed-Powder Method

Grain Refinement of Al<sub>3</sub>Ti Dispersed Aluminum Matrix Composites by Reaction Centrifugal Mixed-Powder Method

Fabrication of novel Al–L12-type Al2.7Fe0.3Ti refiners by spark plasma sintering and their refining performance

Formation of L12modified Al2.5Cu0.5Ti phase by heat treatment of spark-plasma-sintered Cu/Al3Ti specimens

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Product

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Fabrication of novel Al–L1₂-type Al_2.7Fe_0.3Ti refiners by spark plasma sintering and their refining performance

Formation of L1₂modified Al_2.5Cu_0.5Ti phase by heat treatment of spark-plasma-sintered Cu/Al₃Ti specimens