激光悬浮区熔Al<sub>2</sub>O<sub>3</sub>基共晶自生复合材料微观组织与力学性能

doi:10.3724/SP.J.1037.2012.00419

金属学报

2012, Vol. 48

Issue (12): 1479-1486 DOI: 10.3724/SP.J.1037.2012.00419

论文

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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

贾晓娇,张军,苏海军,宋衎,刘林,傅恒志

西北工业大学凝固技术国家重点实验室, 西安 710072

MICROSTRUCTURES AND MECHANICAL PROPERTIES OF Al₂O₃–BASIC EUTECTIC IN SITU COMPOSITES DIRECTIONALLY SOLIDIFIED BY LASER FLOATING ZONE REMELTING

JIA Xiaojiao, ZHANG Jun, SU Haijun, SONG Kan, LIU Lin, FU Hengzhi

State Key Laboratory of Solidification Processing, Northwestern Polytechnical University, Xi’an 710072

引用本文:

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.
JIA Xiaojiao ZHANG Jun SU Haijun SONG Kan LIU Lin FU Hengzhi. MICROSTRUCTURES AND MECHANICAL PROPERTIES OF Al₂O₃–BASIC EUTECTIC IN SITU COMPOSITES DIRECTIONALLY SOLIDIFIED BY LASER FLOATING ZONE REMELTING[J]. Acta Metall Sin, 2012, 48(12): 1479-1486.

全文: PDF(2713 KB)

摘要:

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λ_av与凝固速率V之间符合关系:λ_avV^0.5=12.4 μm^1.5?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?m^1/2. 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.

关键词 ：激光悬浮区熔, 定向凝固, 三元共晶, 自生复合材料, 凝固组织, 断裂韧性

Abstract：

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 (λ_av) and V is determined to be λ_avV ^0.5=12.4 μm^1.5·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.

Key words： laser floating zone remelting directional solidification ternary eutectic in situ composite solidification microstructure fracture toughness

收稿日期: 2012-07-12

ZTFLH:

TG142

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

作者简介: 贾晓娇, 女, 1987年生, 硕士生

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https://www.ams.org.cn/CN/10.3724/SP.J.1037.2012.00419 或 https://www.ams.org.cn/CN/Y2012/V48/I12/1479

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