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Research on fabrication and semisolid processing of semisolid slurries of 7075 aluminum matrix composites reinforced with Nano-sized SiC particles

  • Harbin Institute of Technology
  • Lanzhou University of Technology
  • School of Mechatronics Engineering, Harbin Institute of Technology

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review

Abstract

Semisolid slurries of 7075 aluminum matrix composite reinforced with nano-sized SiC particles were fabricated by ultrasonic assisted semisolid stirring (UASS) method. Rheoforming and thixoforming of typical cylindrical parts were investigated. The results show that high-quality semisolid slurries with spheroidal solid grain of 38 μm were fabricated by UASS. The nano-sized SiC particles were dispersed uniformly due to transient cavitation and acoustic streaming of ultrasonic wave and high and controllable viscosity of semisolid slurry. Typical cylindrical composite parts with good surface quality and complete filling were rheoformed and thixoformed successfully. Ultimate tensile strength (UTS) of the rheoformed and thixoformed composite parts are enhanced due to addition of nano-sized SiC particles. However, elongation decreased as compared to those of the matrix parts. Maximum UTS of 550 MPa was achieved in the thixoformed composite part with T6 treatment. Increase of dislocation density around the reinforcement particles leads to improvement of the strength and wear resistance of the composite.

Original languageEnglish
Title of host publicationSemi-Solid Processing of Alloys and Composites XIV
EditorsAhmed Rassili
PublisherTrans Tech Publications Ltd
Pages81-87
Number of pages7
ISBN (Print)9783035710472
DOIs
StatePublished - 2016
Externally publishedYes
Event14th International Conference on Semi Solid Processing of Alloys and Composites, S2P 2016 - Salt Lake City, United States
Duration: 23 Oct 201627 Oct 2016

Publication series

NameSolid State Phenomena
Volume256
ISSN (Print)1012-0394
ISSN (Electronic)1662-9779

Conference

Conference14th International Conference on Semi Solid Processing of Alloys and Composites, S2P 2016
Country/TerritoryUnited States
CitySalt Lake City
Period23/10/1627/10/16

Keywords

  • Mechanical properties
  • Microstructure
  • Nano-sized SiC particles
  • Rheoforming
  • Thixoforming

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