Journal of Northeastern University(Natural Science)

Journal of Northeastern University ›› 2012, Vol. 33 ›› Issue (9): 1290-1293.DOI: -

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Effect of BN addition on mechanical properties and microstructure of TiB2-Al composites

Wang, Chao (1); Xue, Xiang-Xin (1); Cao, Xiao-Zhou (1); Yang, He (1)   

  1. (1) School of Materials and Metallurgy, Northeastern University, Shenyang 110819, China
  • Received:2013-06-19 Revised:2013-06-19 Online:2012-09-15 Published:2013-04-04
  • Contact: Xue, X.-X.
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Abstract: The phase composition, microstructure and mechanical properties of TiB2-Al composites prepared by vacuum metal infiltration were examined and the effect of BN addition on the microstructure and mechanical properties of TiB2-Al composite was studied. The results showed that AlN is formed due to the surface reaction between Al and BN. AlN exists between TiB2 and Al. With the increase of BN addition, the flexural strength gradually decreases, the fracture toughness firstly increases and then decreases, and the hardness gradually increases. Al amount immersed into the preform is the main reason affecting fracture toughness. TiB2-Al composite with addition of 10% BN shows the better mechanical properties, the flexural strength is 538.48 MPa, the fracture toughness is 7.14 MPa·m1/2 and the hardness(HRC) is 21.2, respectively.

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