• CN: 11-2187/TH
  • ISSN: 0577-6686

Journal of Mechanical Engineering ›› 2022, Vol. 58 ›› Issue (16): 89-99.doi: 10.3901/JME.2022.16.089

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Study on Joining between Si3N4/Al Composite and Aluminum Alloys Based on Porthole Die Co-extrusion Process

WANG Hui, CHEN Liang, LI Zhigang, ZHAO Guoqun, ZHANG Cunsheng   

  1. Key Laboratory of Liquid-Solid Structure Evolution and Materials Processing (Ministry of Education), Shandong University, Jinan 250061
  • Received:2021-11-29 Revised:2022-03-28 Online:2022-08-20 Published:2022-11-03

Abstract: The Si3N4 particle reinforced Al based composite is fabricated by vacuum hot pressing sintering, and the Si3N4/Al composite is respectively joined with 1060, 6063 and 7A99 aluminum alloys based on porthole die co-extrusion method. The bonding interface, grain morphology and micro-texture of the profile with dissimilar alloys, and the effects of extrusion temperature and microstructure on the mechanical properties are clarified. The results show that no crack, void and impurity exist on the bonding interface between Si3N4/Al composite and aluminum alloys, which indicates a favorable bonding quality. The partial dynamic recrystallization takes place in Si3N4/Al composite during extrusion process, exhibiting as elongated and strip-shaped grains as well as fine equiaxed grains, and both the recrystallization fraction and grain size increase with the increase of extrusion temperature. Moreover, the dynamic recrystallization is also enhanced, since the particle stimulated nucleation is promoted due to the addition of Si3N4 particles. The grain morphology exhibits obvious differences in different aluminum alloys. With the increase of extrusion temperature, the near complete dynamic recrystallization occurs in 1060 and 7A99 aluminum alloys, while the abnormal grain growth takes place in 6063 aluminum alloy. In addition, it is noted that the relatively strong rolling texture and some weak recrystallization textures are found in the profile with dissimilar alloys. When Si3N4/Al is joined with 7A99 aluminum alloy, the highest ultimate tensile strength and lowest elongation are achieved, while an opposite tendency is observed when Si3N4/Al is joined with 1060 aluminum alloy.

Key words: Si3N4/Al composite, porthole die co-extrusion, microstructure, mechanical properties

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