Fusion formed and ion exchanged glass-ceramics

A method of making a translucent highly crystalline lithium aluminosilicate glass-ceramic glass article, the method comprising following steps of:

• a.) melting a batch for, and down drawing a glass article having a composition comprising, in weight percent on an oxide basis, of 40-80% SiO2, 2-30% Al2O3, 5-30% Na2O, >0-8% TiO2, 0-3% ZrO2, 0-2% Li2O, whereby the batch produces a glass which exhibits a liquidus viscosity of greater than 75,000 poise;
• b.) ion exchanging the glass article by placing the glass article in a Li-containing salt bath exhibiting a temperature sufficiently above a strain point of the glass;
• c.) ceramming the glass to a temperature between about 550-1100° C. for a period of time sufficient to generate a glass-ceramic which contains a predominant silicate crystal phase and exhibits a glass-ceramic composition within the SiO2—R2O3—Li2O/Na2O—TiO2 system, wherein R comprises;
• and
• d.) cooling the glass-ceramic article to room temperature.