Method for forming glass-ceramic articles and glass-ceramic articles formed therefrom

A method for making a glass-ceramic article from a glass-ceramic composition, the process comprising:

• annealing an as-formed glass article comprising a glass-ceramic composition at a first temperature for a duration sufficient to nucleate a plurality of nuclei within a vitreous matrix of the glass-ceramic composition and forming a post-nucleation glass article;
• and
• annealing the post-nucleation glass article at a second temperature for a duration sufficient to grow crystalline grains within the vitreous matrix of the post-nucleation glass article and forming a glass-ceramic article;
• wherein the first temperature is less than a glass transition temperature for the glass-ceramic composition and the second temperature is greater than the glass transition temperature for the glass-ceramic composition;
• wherein the glass-ceramic composition comprises a chemical composition comprising Li2O, Al2O3, SiO2, and Fe2O3, and has a glass transition temperature between about 590° C. and about 610° C.;
• wherein a viscosity of the as-formed glass article at the first temperature is equal to or greater than 1.0×1013 poise and the viscosity of the post-nucleation glass article at the second temperature is less than 1.0×1013 poise.