Directionally Solidified Al2O3/Er3Al5O12 and Al2O3/Yb3Al5O12 Eutectic Ceramics Prepared by Optical Floating Zone Melting

doi:10.15541/jim20200508

Abstract

Abstract:

Al₂O₃/Er₃Al₅O₁₂(ErAG) and Al₂O₃/Yb₃Al₅O₁₂(YbAG) eutectic rods with fine and homogeneous microstructure, free from cracks or pores, were directionally solidified using optical floating zone method at growth rate of 10 mm/h. The crystallographic orientation, preferred orientation, and 3D distribution of Al₂O₃ and Er₃Al₅O₁₂/Yb₃Al₅O₁₂phases in the terminal growth zone of Al₂O₃/ErAG and Al₂O₃/YbAG eutectics were investigated by EBSD and high-resolution X-ray microscope. Vickers hardness of the as-prepared Al₂O₃/ErAG and Al₂O₃/YbAG eutectics are determined as (13.5±0.4) and (12.8±0.1) GPa, respectively. The fracture toughness results of Al₂O₃/ErAG and Al₂O₃/YbAG are (3.0±0.2) and (3.2±0.1) MPa·m^1/2, respectively.

Key words: directional solidification, eutectic ceramic, microstructure, mechanical property

CLC Number:

TQ174

SUN Luchao, ZHOU Cui, DU Tiefeng, WU Zhen, LEI Yiming, LI Jialin, SU Haijun, WANG Jingyang. Directionally Solidified Al₂O₃/Er₃Al₅O₁₂ and Al₂O₃/Yb₃Al₅O₁₂ Eutectic Ceramics Prepared by Optical Floating Zone Melting[J]. Journal of Inorganic Materials, 2021, 36(6): 652-658.

Figures/Tables 9

References 29

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Eutectic system	Growth method	Growth directions	Orientation relationships
Al₂O₃/ErAG	OFZ	<$10\bar{1}0$> Al₂O₃//<111> ErAG	{0001} Al₂O₃//{211} ErAG
Al₂O₃/REAG	OFZ	<$10\bar{1}0$> Al₂O₃//<101> REAG	{0001} Al₂O₃//{211} REAG
RE=Er/Yb^[24]	OFZ	<$10\bar{1}0$> Al₂O₃//<$2\bar{1}0$> REAG	{0001} Al₂O₃//{211} REAG
Al₂O₃/YAG^[25]	OFZ	<$10\bar{1}0$> Al₂O₃//<101> YAG	{0001} Al₂O₃//{211} YAG
Al₂O₃/YAG^[26]	LFZ	<$1\bar{1}00$> Al₂O₃//<111> YAG	{0001} Al₂O₃//{$1\bar{1}2$} YAG
Al₂O₃/YAG^[27]	Bridgman	<$1\bar{1}20$> Al₂O₃//<110> YAG	-
Al₂O₃/YAG^[27]	Bridgman	<$01\bar{1}0$> Al₂O₃//<110> YAG	-
Al₂O₃/YAG^[28]	LSP	<$10\bar{1}0$> Al₂O₃//<101> YAG	{0001} Al₂O₃//{211} YAG

Eutectic system	Growth method	Growth directions	Orientation relationships
Al₂O₃/ErAG	OFZ	<$10\bar{1}0$> Al₂O₃//<111> ErAG	{0001} Al₂O₃//{211} ErAG
Al₂O₃/REAG	OFZ	<$10\bar{1}0$> Al₂O₃//<101> REAG	{0001} Al₂O₃//{211} REAG
RE=Er/Yb^[24]	OFZ	<$10\bar{1}0$> Al₂O₃//<$2\bar{1}0$> REAG	{0001} Al₂O₃//{211} REAG
Al₂O₃/YAG^[25]	OFZ	<$10\bar{1}0$> Al₂O₃//<101> YAG	{0001} Al₂O₃//{211} YAG
Al₂O₃/YAG^[26]	LFZ	<$1\bar{1}00$> Al₂O₃//<111> YAG	{0001} Al₂O₃//{$1\bar{1}2$} YAG
Al₂O₃/YAG^[27]	Bridgman	<$1\bar{1}20$> Al₂O₃//<110> YAG	-
Al₂O₃/YAG^[27]	Bridgman	<$01\bar{1}0$> Al₂O₃//<110> YAG	-
Al₂O₃/YAG^[28]	LSP	<$10\bar{1}0$> Al₂O₃//<101> YAG	{0001} Al₂O₃//{211} YAG

Eutectic system	Preparation method	Vickers hardness /GPa	Fracture toughness /(MPa·m^1/2)
Al₂O₃/ErAG	OFZ	(13.5±0.4)	(3.0 ± 0.2)
Al₂O₃/YbAG	OFZ	(12.8±0.1)	(3.2 ± 0.1)
Al₂O₃/ErAG^[9]	LFZ	(14.5-16.0)	1.9
Al₂O₃/ErAG^[19]	LFZ	(14.9±0.7)	(1.8 ± 0.3)
Al₂O₃/YbAG^[19]	LFZ	(14.8±0.6)	(2.2 ± 0.5)
Al₂O₃/YAG^[24]	OFZ	13.5	(3.1±0.3)

Eutectic system	Preparation method	Vickers hardness /GPa	Fracture toughness /(MPa·m^1/2)
Al₂O₃/ErAG	OFZ	(13.5±0.4)	(3.0 ± 0.2)
Al₂O₃/YbAG	OFZ	(12.8±0.1)	(3.2 ± 0.1)
Al₂O₃/ErAG^[9]	LFZ	(14.5-16.0)	1.9
Al₂O₃/ErAG^[19]	LFZ	(14.9±0.7)	(1.8 ± 0.3)
Al₂O₃/YbAG^[19]	LFZ	(14.8±0.6)	(2.2 ± 0.5)
Al₂O₃/YAG^[24]	OFZ	13.5	(3.1±0.3)

Directionally Solidified Al₂O₃/Er₃Al₅O₁₂ and Al₂O₃/Yb₃Al₅O₁₂ Eutectic Ceramics Prepared by Optical Floating Zone Melting

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