J Mater Sci Technol ›› 2006, Vol. 22 ›› Issue (01): 135-138.

• Research Articles • Previous Articles     Next Articles

Effect of Interstitial Hydrogen on Cohesive Strength of Al Grain Boundary with Mg Segregation

Xiaoguang LIU, Xiaowei WANG, Jingyang WANG, Hongyan ZHANG   

  1. Shenyang National Laboratory for Materials Science, Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China...
  • Received:2005-04-04 Revised:2005-06-07 Online:2006-01-28 Published:2009-10-10
  • Contact: Xiaowei WANG

Abstract: The effect of interstitial hydrogen on the cohesion of the Al ∑=11(113) grain boundary (GB) is investigated based on the thermodynamic model of Rice-Wang using the first-principles density function calculation. The results indicate that interstitial H behaves as an embrittler from "strengthening energy" analysis. The reduced GB cohesion due to the presence of H at the GB is attributed to the low affinity between H and Al, and the weakened bonding of Al atomic pairs perpendicular to GB plane.

Key words: Hydrogen, Grain boundary, Al-Mg alloys