激光悬浮区熔Al2O3基共晶自生复合材料微观组织与力学性能
收稿日期: 2012-07-12
修回日期: 2012-08-23
网络出版日期: 2012-12-11
基金资助
国家自然科学基金项目51002122和51272211, 陕西省自然科学基金项目2010JQ6005以及航空科学基金项目2010ZF53064资助
MICROSTRUCTURES AND MECHANICAL PROPERTIES OF Al2O3–BASIC EUTECTIC IN SITU COMPOSITES DIRECTIONALLY SOLIDIFIED BY LASER FLOATING ZONE REMELTING
Received date: 2012-07-12
Revised date: 2012-08-23
Online published: 2012-12-11
Supported by
Supported by National Natural Science Foundation of China (Nos.51002122 and 51272211), Natural Science Foundation of Shanxi Province (No.2010JQ6005) and Aeronautical Science Foundation of China (No.2010ZF53064)
采用激光悬浮区熔定向凝固方法制备了高致密度Al2O3/YAG/ZrO2共晶自生复合陶瓷材料,研究多元复相陶瓷在高温度梯度、不同生长条件下的凝固组织形态演化规律, 定量表征凝固速率与氧化物陶瓷共晶间距的关系, 在此基础上, 考察其力学性能并分析凝固组织与断裂韧性的关系. 研究结果表明:激光悬浮区熔Al2O3/YAG/ZrO2三元自生复合材料呈现与热流方向平行、定向性良好的非规则层片共晶形貌, 共晶组织随凝固速率的增大而快速细化, 凝固速率为200 μm/s时, 最小层片间距达到0.46 μm. 平均层片间距λav与凝固速率V之间符合关系:λavV0.5=12.4 μm1.5?s-0.5,且明显小于同等凝固速率条件下Al2O3/YAG二元共晶的平均层片间距.Al2O3/YAG/ZrO2三元共晶平均硬度为(19.0±1.0) GPa, 室温断裂韧性为(3.31±0.2) MPa?m1/2. 与二元共晶相比, 裂纹捕获、偏转以及共晶相热胀系数失配是三元共晶室温断裂韧性提高的主要原因.
贾晓娇 张军 苏海军 宋衎 刘林 傅恒志 . 激光悬浮区熔Al2O3基共晶自生复合材料微观组织与力学性能[J]. 金属学报, 2012 , 48(12) : 1479 -1486 . DOI: 10.3724/SP.J.1037.2012.00419
Directionally solidified oxide eutectic in situ composites have been attracting increasing interest in recent years for use as the next generation of ultra–high–temperature structural materials because of their excellent high–temperature strength, oxidation and creep resistance, as well as outstanding microstructural stability. Al2O3/YAG/ZrO2 ternary eutectic in situ composites with high density are prepared by laser floating zone remelting technique. The microstructure evolution of Al2O3/YAG/ZrO2 ternary eutectic under high temperature gradient and different growth rates is investigated. The relationship between solidification rate and eutectic spacing for the ternary oxideeutectic is quantificationally characterized. On this basis, the mechanical properties and relationship between microstructure and fracture toughness are analysed. The results show that the directionally solidified Al2O3/YAG/ZrO2 ternary eutectic in situ composite belongs to typical irregular lamellar eutectic structure. The microstructure is rapidly refined with the increase of the solidification rate V . The minimal eutectic spacing observed is as fine as 0.46 μm when the solidification rate is 200 μm/s. The relationship between the average eutectic spacing (λav) and V is determined to be λavV 0.5=12.4 μm1.5·s−0.5. Moreover, the ternary eutectic lamellar spacing is much smaller than the binary one at the same solidification condition. The average hardness and room–temperature fracture toughness of the ternary eutectic are (19.0±1.0) GPa and (3.31±0.2) MPa·m1/2, respectively. As compared with the binary eutectic, the crack arrest, deflection and mismatch of thermal expansion coefficient of eutectic phases are the predominant toughening mechanisms of ternary eutectic composite.
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