Effect of cooling rate on morphology of primary particles in Al-Sc-Zr master alloy

Xu, Cong; Du, Rui; Wang, Xuejiao; Hanada, Shuji; Yamagata, Hiroshi; Wang, Wenhong; Ma, Chao

doi:10.1016/s1003-6326(14)63366-5

Cited by 20 publications

(9 citation statements)

References 24 publications

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“…However, in Cu-Sn-Bi [13] the addition of the rare earth metal Ce was only found to have an effect on the Marangoni velocity, with no link to the volume fraction of the phases being observed. Cooling rate has also been reported to have an effect on Marangoni velocity [4,17], with core-shell microstructures being readily formed at high cooling rates in Al-Si-Zr alloys [19].…”

Section: Introductionmentioning

confidence: 99%

“…Models have also been used by a number of researchers to simulate the formation of core-shell microstructures [1,5,6,11,[19][20][21][22][23]. Xu et al [19] and K. Wang et al [22] used mathematical models to calculate the formation of the shell in Al-Si-Zr and Al-Ti-B-Re grain refiner alloys respectively. Both models were based on the diffusion kinetics of the core-shell structure but were dissimilar in that K. Wang et al [22] assumed continuous diffusion in their model while Xu et al made no such assumption and were able to link the formation rate of the shell to the cooling rate.…”

Section: Introductionmentioning

confidence: 99%

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Metastable monotectic phase separation in Co–Cu alloys

2018

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The liquid phase separation behaviour of metastable monotectic Co-Cu alloys was investigated as a function of cooling rate using a 6.5 m drop tube facility. A range of liquid phase separated morphologies were observed including stable two-layer core-shell, evolving core-shell and dendritic structures. It was found that in the core-shell structures the core was always the higher melting point (Co-rich) phase, irrespective of the core and shell volume fraction. In Cu-50 at. % Co alloy, high cooling rates were observed to yield two episodes of liquid phase separation, corresponding to binodal, followed by spinodal decomposition. The resulting structure comprised a core-shell structure in which the Co-rich core contained a very fine dispersion of Cu-rich particles with a Cu-rich shell which may, or may not, contain a similar dispersion of Co-rich particles.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Metastable monotectic phase separation in Co–Cu alloys

2018

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“…In order to avoid the fading of dislocation strengthening effect caused by recrystallization during high temperature solution treatment, zirconium element has been added to a variety of Al-based alloys to enhance their resistance to recrystallization and thermal stability [1][2][3][4]. Zirconium has several types of existence form in aluminum matrix such as solid solution state, binary Al 3 Zr phase formed during solidification or heat treatment with a metastable L1 2 structure or a stable DO 23 structure [5][6][7][8]. Thus, the relation between the preparation process of zirconium containing aluminum alloy and zirconium existence form, and the effect of various existence form of zirconium on the recrystallization behavior of aluminum alloy deserve a comprehensive and systematic study.…”

Section: Introductionmentioning

confidence: 99%

Effect of solid solution state of zirconium and Al₃Zr (L1₂) precipitates on the recrystallization behavior of Al‐0.2 wt.%Zr alloy

Zhu

Ban

et al. 2020

Materialwissenschaft Werkst

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Effect of homogenization annealing on the existence form of zirconium in Al‐0.2wt.%Zr alloy and effect of various existence form of zirconium on the recrystallization behavior of Al‐0.2wt.%Zr cold‐rolled (total deformation is 92.8 %) sheet are studied. The results show that large numbers of nearly spherical Al3Zr (L12) nanoparticles precipitated from aluminum matrix after homogenizing at 475 °C for 24 h. Moreover, due to the precipitation of Al3Zr particles, the hardness and electrical conductivity of the as‐cast Al‐0.2wt.%Zr alloy is increased from 25.1±0.5 HV 3 and 54.0±0.2 %IACS to 28.6±0.7 HV 3 and 56.2±0.1 %IACS, respectively. Hence, zirconium exists as solid solution state in the as‐cast Al‐0.2wt.%Zr alloy and metastable Al3Zr phase in the homogenized alloy. Moreover, the recrystallization temperature of the pure aluminum without addition of zirconium is 300 °C, while the recrystallization temperature of the Al‐0.2wt.%Zr alloy without and with homogenization is about 350 °C and 400 °C, respectively. Obviously, the solid solution state of zirconium has certain effect on retarding the recrystallization of aluminum alloy, while the nanometer Al3Zr particles can inhibit the recrystallization of aluminum alloy effectively and increase the recrystallization temperature remarkably.

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“…Their initial melting point is higher than that of Ni-Al alloys [4]. The most effective way to control the structure of aluminum (nickel) alloys is to introduce small amounts of transition metals (TM) as additions to binary [5][6][7][8][9][10] and multicomponent [11][12][13][14][15][16][17][18][19] master alloys: Al-TM (Ti, Zr, Sc, Hf, etc.) and Al-Sc-Zr; Al-Zr-Ti; Al-Sc-Ti; etc.…”

Section: Introductionmentioning

confidence: 99%

Synthesis of Complex-Alloyed Nickel Aluminides from Oxide Compounds by Aluminothermic Method

Gostishchev

et al. 2018

Metals

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This paper deals with the investigation of complex-alloyed nickel aluminides obtained from oxide compounds by aluminothermic reduction. The aim of the work was to study and develop the physicochemical basis for obtaining complex-alloyed nickel aluminides and their application for enhancing the properties of coatings made by electrospark deposition (ESD) on steel castings, as well as their use as grain refiners for tin bronze. The peculiarities of microstructure formation of master alloys based on the Al-TM (transition metal) system were studied using optical, electronic scanning microscopy and X-ray spectral microanalysis. There were regularities found in the formation of structural components of aluminum alloys (

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Effect of cooling rate on morphology of primary particles in Al-Sc-Zr master alloy

Cited by 20 publications

References 24 publications

Metastable monotectic phase separation in Co–Cu alloys

Metastable monotectic phase separation in Co–Cu alloys

Effect of solid solution state of zirconium and Al₃Zr (L1₂) precipitates on the recrystallization behavior of Al‐0.2 wt.%Zr alloy

Synthesis of Complex-Alloyed Nickel Aluminides from Oxide Compounds by Aluminothermic Method

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Effect of cooling rate on morphology of primary particles in Al-Sc-Zr master alloy

Cited by 20 publications

References 24 publications

Metastable monotectic phase separation in Co–Cu alloys

Metastable monotectic phase separation in Co–Cu alloys

Effect of solid solution state of zirconium and Al3Zr (L12) precipitates on the recrystallization behavior of Al‐0.2 wt.%Zr alloy

Synthesis of Complex-Alloyed Nickel Aluminides from Oxide Compounds by Aluminothermic Method

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Effect of solid solution state of zirconium and Al₃Zr (L1₂) precipitates on the recrystallization behavior of Al‐0.2 wt.%Zr alloy