J Mater Sci Technol ›› 2005, Vol. 21 ›› Issue (01): 79-82.

• Research Articles • Previous Articles     Next Articles

Synthesis and Enhanced Superplasticity of the Zirconia-dispersed Alumina Nanocomposite

Guoqing CHEN, Kaifeng ZHANG, Wenbo HAN, Junting LUO   

  1. School of Materials Science and Engineering, Harbin Institute of Technology, Harbin 150001, China
  • Received:1900-01-01 Revised:1900-01-01 Online:2005-01-28 Published:2009-10-10
  • Contact: Kaifeng ZHANG

Abstract: A series of alumina-zirconia composites with various grain sizes were prepared from the nano-sized powders with different agglomerations. Microstructural analysis of the sintered compacts indicates that the as-sintered material is a typical intra/inter granular nanocomposite with uniform distribution of the zirconia grains in the alumina matrix. Superplastic deep drawing test under different conditions demonstrates that dense Al2O3/ZrO2 samples with average grain size of 230 nm can be elongated to a dome height of at least 12 mm at the punch rate of 0.6 mm•min-1 at 1400℃. Further drawing tests show that for the composites with larger grain size, such elongation cannot be achieved at such a strain rate.

Key words: Nanocomposite, Synthesis, Microstructure, Superplasticity