Phase growth patterns for Al2O3/GdAlO3 eutectics over wide ranges of compositions and solidification rates

doi:10.1016/j.jmst.2020.03.087

Abstract

Abstract:

Phase selection and growth characteristics of directionally solidified Al₂O₃/GdAlO₃ (GAP) faceted eutectic ceramics are investigated over wide ranges of compositions and solidification rates to explore the eutectic coupled zone. Through the observation of the quenched solid-liquid interface, the competitive growth of primary faceted Al₂O₃ phase, primary non-faceted GAP phase and Al₂O₃/GAP eutectic with different morphologies is detected. Microstructure transitions from wholly eutectic to primary Al₂O₃ (GAP) dendrite plus eutectic and then to wholly eutectic are found in Al₂O₃-20 mol% Gd₂O₃ hypoeutectic (Al₂O₃-26 mol% Gd₂O₃ hypereutectic) ceramics with the increase of solidification rate. The dendrite growth of faceted Al₂O₃ and non-faceted GAP phases are well predicted by KGT model, which have introduced appropriate dimensionless supersaturation Ω to characterize the anisotropic growth of dendrites. Based on the maximum interface temperature criterion, the competitive growth of primary phase and eutectic is analyzed theoretically and the predicted coupled zone of Al₂O₃/GAP eutectic ceramics is in good agreement with the experimental results. Besides, the influence of microstructure with these different morphologies on the flexural strength of Al₂O₃/GAP eutectic ceramics is studied.

Key words: Directional solidification, Competitive growth, Flexural strength, Laser floating zone melting

Weidan Ma, Jun Zhang, Haijun Su, Guangrao Fan, Min Guo, Lin Liu, Hengzhi Fu. Phase growth patterns for Al₂O₃/GdAlO₃ eutectics over wide ranges of compositions and solidification rates[J]. J. Mater. Sci. Technol., 2021, 65: 89-98.

Figures/Tables 10

Fig. 1. Microstructure map for Al2O3/GAP eutectic ceramics with the Gd2O3 composition of 19-28 mol% at different solidification rates (CS and CR are the abbreviations of “Chinese script” and complex regular, respectively).

Fig. 2. EDS analyses of (a) primary Al2O3 in AG19 and (b) primary GAP in AG26 as well as (c) the XRD patterns of AG19 and AG26 solidified at 16 μm/s.

Fig. 3. Solid-liquid interface morphologies of (a) AG15 and (b) AG28 at 16 μm/s and transverse microstructures of (c) AG15 and (d) AG28 at 100 μm/s.

Fig. 4. Solid-liquid interface morphologies of (a) AG20 (d) AG28 at 100 μm/s, and microstructures of AG20 (b) in quenching area and (c) in the as-solidified area.

Table 1 Parameters for calculating the coupled zone of Al2O3/GAP eutectic system: α=Al2O3 and β=GAP.

Parameter	α(Al₂O₃)	β(GAP)	References
Eutectic temperature, Te (K)	2015		[21,22]
Liquidus slope, m (K/mol%)	-13.57	12.11	[21,22]
Equilibrium partition coefficient, k	0	0	[21,22]
Gibbs-Thomson coefficient, Γ (m K)	2.53 × 10^-7	3 × 10^-7	[20]
Solute diffusion coefficient, DL(m²/s)	6 × 10^-10		[20]
Temperature gradient, G (K/m)	5.3 × 10⁵		[20]

Fig. 5. Theoretical predictions of the interface temperature of dendrite and eutectic for (a) AG25, (b) AG26 and (c) AG20, as well as the microstructures of each ceramics at certain solidification rates.

Fig. 6. Theoretical prediction and experimental comparison of the coupled zone of Al2O3/GAP eutectic system.

Fig. 7. (a) The stress-strain curves and (b) the average flexural strengths of Al2O3/GAP eutectic ceramics with different compositions and solidification rates, where the fracture morphologies of specimens are included, and (c, d) the relationship between the average flexural strength and the characteristic length (colony diameter and eutectic spacing).

Fig. 8. Longitudinal microstructures near the fracture for (a) AG 19 at 30 μm/s, (b) AG26 at 30 μm/s, (c) AG20 at 100 μm/s and (d) AGE at 100 μm/s.

Fig. 9. Weibull plots of the flexural strength of AG19, AGE and AG26, where Pf and σf stand for the failure probability and the flexural strength in MPa, respectively.

References 36

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Phase growth patterns for Al₂O₃/GdAlO₃ eutectics over wide ranges of compositions and solidification rates

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