中国物理B ›› 2012, Vol. 21 ›› Issue (6): 66501-066501.doi: 10.1088/1674-1056/21/6/066501

• CONDENSED MATTER: STRUCTURAL, MECHANICAL, AND THERMAL PROPERTIES • 上一篇    下一篇

The effect of intragranular microstress in Al2O3–SiC nanocomposites

王志远a b, 吴裕功a b, 佟帅a b, 吴斯骐a b   

  1. a. School of Electronic and Information Engineering, Tianjin University, Tianjin 300072, China;
    b. Key Laboratory of Advanced Ceramics and Machining Technology, Ministry of Education (Tianjin University), Tianjin 300072, China
  • 收稿日期:2011-10-08 修回日期:2011-12-08 出版日期:2012-05-01 发布日期:2012-05-01
  • 基金资助:
    Project supported by the Tianjin Natural Science Foundation, China (Grant No. 09JCZDJC22500).

The effect of intragranular microstress in Al2O3–SiC nanocomposites

Wang Zhi-Yuan(王志远)a)b), Wu Yu-Gong(吴裕功)a)b)†, Tong Shuai(佟帅)a)b), and Wu Si-Qi(吴斯骐)a)b)   

  1. a. School of Electronic and Information Engineering, Tianjin University, Tianjin 300072, China;
    b. Key Laboratory of Advanced Ceramics and Machining Technology, Ministry of Education (Tianjin University), Tianjin 300072, China
  • Received:2011-10-08 Revised:2011-12-08 Online:2012-05-01 Published:2012-05-01
  • Contact: Wu Yu-Gong E-mail:wuyugong@tju.edu.cn
  • Supported by:
    Project supported by the Tianjin Natural Science Foundation, China (Grant No. 09JCZDJC22500).

摘要: A theoretical model is established to investigate the intragranular particle residual stress in Al2O3-SiC nanocomposites. Using this model, we calculate the average compressive stress on the Al2O3 grain boundary (GB) and the average tensile stress within Al2O3 grains caused by SiC nanoparticles. The normal compressive stress strengthens the GB, and the average tensile stress weakens the grains. The model gives a reasonable interpretation of the strength changes of Al2O3-SiC nanocomposites with the number of SiC particles.

关键词: nanocomposite, grain boundary strengthening, internal stress, weakening

Abstract: A theoretical model is established to investigate the intragranular particle residual stress in Al2O3-SiC nanocomposites. Using this model, we calculate the average compressive stress on the Al2O3 grain boundary (GB) and the average tensile stress within Al2O3 grains caused by SiC nanoparticles. The normal compressive stress strengthens the GB, and the average tensile stress weakens the grains. The model gives a reasonable interpretation of the strength changes of Al2O3-SiC nanocomposites with the number of SiC particles.

Key words: nanocomposite, grain boundary strengthening, internal stress, weakening

中图分类号:  (Thermal properties of small particles, nanocrystals, nanotubes, and other related systems)

  • 65.80.-g
78.67.Sc (Nanoaggregates; nanocomposites) 83.60.Hc (Normal stress differences and their effects (e.g. rod climbing))