东北大学学报（自然科学版）

东北大学学报(自然科学版) ›› 2012, Vol. 33 ›› Issue (9): 1290-1293.DOI: -

• 论著 • 上一篇    下一篇

添加BN对TiB_2-Al复合材料显微组织与力学性能的影响

王超;薛向欣;曹晓舟;杨合;   

  1. 东北大学材料与冶金学院;
  • 收稿日期:2013-06-19 修回日期:2013-06-19 出版日期:2012-09-15 发布日期:2013-04-04
  • 通讯作者: -
  • 作者简介:-
  • 基金资助:
    中央高校基本科研业务费专项资金资助项目(N100602005,N100402008)

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.
  • About author:-
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摘要： 对金属浸渗法制备的TiB2-Al复合材料进行物相、显微组织以及力学性能方面的检测,研究了添加BN对于TiB2-Al复合材料力学性能与显微组织的影响.物相分析发现,添加的BN与金属Al进行了界面反应生成了AlN;显微组织分析发现,AlN产生于TiB2与Al界面;力学检测发现,随着BN添加量的增加,抗折强度逐渐下降,断裂韧性先增加再下降,硬度逐渐增加.浸入预制体中Al的量是影响材料断裂韧性的主要原因;当BN的添加量为10%时,TiB2-Al显现出较好的力学性能,抗折强度、断裂韧性和硬度(HRC)分别为538.48 MPa,7.14MPa.m1/2和21.2.

关键词: 复合材料, TiB2-Al, 物相组成, 力学性能, 金属浸渗

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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