多重纳米结构轻质高强铝基复合材料的制备和组织性能

doi:10.7527/S1000-6893.2014.0149

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多重纳米结构轻质高强铝基复合材料的制备和组织性能

郑瑞晓, 张艺镡, 马朝利, 马凤梅, 肖文龙

北京航空航天大学材料科学与工程学院, 北京 100191

收稿日期:2014-04-22 修回日期:2014-07-08 出版日期:2014-10-25 发布日期:2014-07-17
通讯作者: 马朝利，Tel.：010-82339772 E-mail：machaoli@buaa.edu.cn E-mail:machaoli@buaa.edu.cn
作者简介:郑瑞晓男，博士研究生。主要研究方向：高强铝合金及其复合材料的制备及性能。 Tel：010-82339772 E-mail：zhengrx1987@163.com；马朝利男，博士，教授，博士生导师。主要研究方向：轻质高强结构材料的设计、制备及性能。 Tel：010-82339772 E-mail：machaoli@buaa.edu.cn
基金资助:
国家"973"计划（2012CB619503）；国家"863"计划（2013AA031001）；国家国际科技合作专项（2012DFA50630）

Preparation and Investigation of Microstructure and Mechanical Properties of Ultra-high Strength Al Alloy Matrix Composites with Hybrid Nanostructure

ZHENG Ruixiao, ZHANG Yitan, MA Chaoli, MA Fengmei, XIAO Wenlong

School of Materials Science and Engineering, Beihang University, Beijing 100191, China

Received:2014-04-22 Revised:2014-07-08 Online:2014-10-25 Published:2014-07-17
Supported by:
National Basic Research Program of China ( 2012CB619503); National High Technology Research and Development Program of China (2013AA031001); International Science & Technology Cooperation Program of China (2012DFA50630)

摘要/Abstract

摘要：

为了研究多重纳米结构对块体材料强化和变形能力的影响机制，采用粉末冶金法制备了多重纳米结构的B₄C颗粒增强铝基复合材料，并对复合材料的强化和形变破坏机制进行了定量和定性的讨论。由100%球磨复合粉末制备的块体复合材料的室温压缩强度为670 MPa；当加入10vol%气雾化态的Al2024粉末后，复合材料的室温压缩强度升高到1.115 GPa；之后随着气雾化态Al2024粉末含量的增加，复合材料的强度逐渐下降，但是没有产生明显的塑性变形；当气雾化态Al2024粉末的含量增加到50vol%时，复合材料的压缩强度下降到580 MPa，断裂前变形率达到了10%。扫描电镜（SEM）和透射电镜（TEM）的分析结果显示，亚微米级的B₄C颗粒、位错以及纳米晶基体分别通过Orowan强化、位错强化和细晶强化机制对复合材料进行强化；粗晶Al2024区域与复合结构区域的比例显著影响复合材料的形变及破坏机制。

关键词: 多重纳米结构, 金属基复合材料, 机械球磨, 强化机制, 力学性能

Abstract:

B₄C particles reinforced Al2024 matrix composites were fabricated by using powder metallurgy method, in order to study the effect of hybrid nanostructure on the strengthening, deformation and fracture mechanisms of the composites. The composites made from 100% mechanical milled composite powders have fracture strength of 670 MPa. When mixing with 10vol% un-milled Al2024 powder, the room temperature compression strength of the composites is increased to 1.115 GPa. After that, the room temperature compression strength of the composites decreases with the increase of the content of un-milled Al2024 powder, and the composites show no visible plastic deformation. However, when the fraction of un-milled Al2024 powder increases to 50vol%, the compression strength is decreased to 580 MPa, while retaining a remarkable fracture strain up to 10%. The microstructures of the composites with different compositions were examined by scanning electron microscope (SEM) and transmission electron microscope (TEM). The results show that sub-micro sized B₄C particles, dislocations and nano-crystalline matrix enhance the strength of the composites through Orowan strengthening, dislocation strengthening and grain refinement strengthening, respectively. The ratio between coarse-grained region and composites region has a significant effect on the deformation and fracture behavior of the composites.

Key words: hybrid nanostructure, metal matrix composites, mechanical milling, strengthening mechanism, mechanical properties

中图分类号:

郑瑞晓, 张艺镡, 马朝利, 马凤梅, 肖文龙. 多重纳米结构轻质高强铝基复合材料的制备和组织性能[J]. 航空学报, 2014, 35(10): 2802-2812.

ZHENG Ruixiao, ZHANG Yitan, MA Chaoli, MA Fengmei, XIAO Wenlong. Preparation and Investigation of Microstructure and Mechanical Properties of Ultra-high Strength Al Alloy Matrix Composites with Hybrid Nanostructure[J]. ACTA AERONAUTICAET ASTRONAUTICA SINICA, 2014, 35(10): 2802-2812.

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E-mail：hkxb@buaa.edu.cn

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主管单位：中国科学技术协会主办单位：中国航空学会北京航空航天大学

多重纳米结构轻质高强铝基复合材料的制备和组织性能

Preparation and Investigation of Microstructure and Mechanical Properties of Ultra-high Strength Al Alloy Matrix Composites with Hybrid Nanostructure

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