| Formation of Metastable t'-Phase in Solute-Redistributed Y-PSZ. (1998) | |||||||||
Abstract | |||||||||
| Owing to solute redistribution by a liquid phase analogue of diffusion-induced grain-boundary migration metastable and anti-phase domain boundary-bearing tetragonal (t-prime) phase was seen to occur in the cubic(c) matrix grain of sintered (1400C, 2h) and furnace-cooled yttria partially stabilized zirconia (Y-PSZ) specimens (TZ3Y + 12Y-PSZ in molar ratios of 4:1, 1:1 and 1:4 ). In contrast to that formed by rapid cooling, t-prime-phase formed by slow cooling shows no deformation accommodation twins. Subsequent ageing at 1100C for up to 240 h caused the formation of finely tweed(c) and tetragonal(t) assemblages at the expense of coarse tweed t-prime-phase in the 12Y-PSZ grains. The absence of secondary deformation twins in the t-prime phase formed by slow cooling is discussed. | |||||||||
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