The effect of submicron grain size on thermal stability and mechanical properties of highentropy carbide ceramics Academic Article uri icon

abstract

  • Abstract(Hf0.2Zr0.2Ta0.2Nb0.2Ti0.2)C highentropy ceramics (HEC) with a submicron grain size of 400 to 600nm were fabricated by spark plasma sintering using a twostep sintering process. Both Xray and neutron diffractions confirmed the formation of singlephase with rock salt structure in the asfabricated (Hf0.2Zr0.2Ta0.2Nb0.2Ti0.2)C samples. The effect of submicron grain size on the thermal stability and mechanical properties of HEC was investigated. The grain growth kinetics in the finegrained HEC was small at 1300 and 1600C, suggesting high thermal stability that was possibly related to the compositional complexity and sluggish diffusion in HEC. Compared to the coarsegrain HEC with a grain size of 16.5m, the bending strength and fracture toughness of finegrained HEC were 25% and 20% higher respectively. The improvement of mechanical properties in finegrained HEC may be attributed to micromechanistic mechanisms such as crack deflection.

published proceedings

  • Journal of the American Ceramic Society

author list (cited authors)

  • Wang, F., Zhang, X., Yan, X., Lu, Y., Nastasi, M., Chen, Y., & Cui, B.

complete list of authors

  • Wang, Fei||Zhang, Xiang||Yan, Xueliang||Lu, Yongfeng||Nastasi, Michael||Chen, Yan||Cui, Bai

publisher