Superplasticity and superplastic-like flow in cubic zirconia with silica

Abstract

Experiments were conducted at temperatures from 1573 to 1748 K to evaluate the flow properties and the potential for achieving superplasticity in an 8 mol% Y 2 O 3 -stabilized cubic ZrO 2 (termed 8Y-CSZ) containing 5 wt% colloidal SiO 2 . Tests were conducted under constant strain rate conditions and under creep conditions at constant stress. The stress exponent was determined as *1.8, and the activation energy for creep was measured as *600-670 kJ mol -1 . The results show that the presence of an amorphous second phase is effective in limiting grain growth. A maximum superplastic elongation of more than 500 % was recorded at a testing temperature of 1703 K. An analysis of the results suggests that the flow mechanism is associated with interface-controlled diffusion creep.

Forty-Five Years of Superplastic Research: Recent Developments and Future Prospects

“…The initial grain size of this material was only ~0.25 µm. Very recently, the occurrence of superplasticity was also reported in polycrystalline yttria-stablized cubic zirconia containing 5 wt% colloidal silica where the initial grain size was ~0.7 µm [29].…”

Use of the Superplasticity Phenomenon of Steel for "Internal" Magnetic Correcting a Product

“…Therefore the mechanical correcting of products in temperature interval M d -M s (in which superplasticity is shown) initiates the formation of martensite deformations. It is carried out easily even at a small pressure as the superplastic metal material on the behaviour at deformation reminds pitches, hot glass, thermoplastics and other viscous bodies [12][13][14][15][16].…”