Articles

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

Received date: 2014-04-22

  Revised date: 2014-07-08

  Online 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)

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.

Cite this article

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 . DOI: 10.7527/S1000-6893.2014.0149

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