Mechanical properties of directionally solidified Al2O3-ZrO2(Y2O3) eutectics
Mechanical properties of directionally solidified Al2O3-ZrO2(Y2O3) eutectics
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DOI：
10.1016/s0921-5093(00)02040-2
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发表时间：
2001-06-30
期刊：
影响因子：
6.4
通讯作者：
Orera, VM
中科院分区：
文献类型：
--
作者：
Pastor, JY;Poza, P;Orera, VM
研究了Al_2O_3-ZrO_2共晶棒材的显微组织与力学性能的关系。通过使用激光加热浮区法的定向凝固生产的材料主要由由ZrO 2和α-Al 2 O 3的细互穿或有序网络组成的菌落形成，所述细互穿或有序网络被包含孔隙和其他缺陷的厚边界区域包围。共晶棒的弯曲强度优异（> 1.1GPa），这是由于临界缺陷尺寸小和高韧性（7.8MPa rootm）。在1700 K下暴露约1小时后没有观察到微观结构的变化，并且共晶氧化物在此温度下保持非常高的强度。根据材料的微观结构特征，讨论了导致断裂的临界缺陷的性质、增韧微观机制以及纵向和横向强度之间的差异。(C)2001 Elsevier Science B. V.保留所有权利。
The relationship between microstructure and mechanical properties was studied in Al2O3-ZrO2 eutectic rods. The material, produced by directional solidification using the laser-heated float zone method, was formed mainly of colonies consisting of a fine interpenetrating or ordered network of ZrO2 and alpha -Al2O3 surrounded by a thick boundary region that contained pores and other defects. The flexure strength of the eutectic rods was excellent (> 1.1 GPa) owing to the small critical defect size and the high toughness (7.8 MPa rootm). No microstructural changes were observed after about 1 h of exposure at 1700 K, and the eutectic oxide maintained a very high strength up to this temperature. The nature of the critical defects that led to fracture, the toughening micromechanisms, and the differences between the longitudinal and transverse strength are discussed in the light of the microstructural features of the material. (C) 2001 Elsevier Science B.V. All rights reserved.