J Mater Sci Technol ›› 2008, Vol. 24 ›› Issue (05): 813-815.

• Research Articles • Previous Articles     Next Articles

A Banding Structure in a Ni-Cu-Si Cast Alloy

Qi ZHENG, Yufeng ZHENG, Hongyu ZHANG, Xiaofeng SUN, Hengrong GUAN, Zhuangqi HU   

  1. Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China
  • Received:2007-07-11 Revised:2007-11-07 Online:2008-09-28 Published:2009-10-10
  • Contact: Qi ZHENG

Abstract: The solidified microstructure of a Ni-Cu-Si cast alloy has been investigated, and a kind of banding structure was observed. The results showed that, the banding structure was composed of coarser particles which were Ni3Si type of precipitates and similar to the fine particles precipitate uniformly distributed within matrix of Ni solid solution, in both crystal structure and composition. The formation of bandings was resulted from cast thermal stress and dislocation walls. It was found that the cracks propagated along these bandings in tensile test. The banding structure can be depressed by reducing the cast thermal stress, which can improve the tensile ductility.

Key words: Ni-Cu-Si cast alloy, Banding structure, Solidification, Thermal stress