Ion-exchangeable mixed alkali aluminosilicate glasses

A glass article comprising:

• a first surface;
• a second surface opposite the first surface, wherein a thickness (t) of the glass article is measured as a distance between the first surface and the second surface;
• and
• a compressive stress layer extending from at least one of the first surface and the second surface into the thickness (t) of the glass article, wherein
• a central tension of the glass article is greater than or equal to 30 MPa,
• the compressive stress layer has a depth of compression that is from greater than or equal to 0.15t to less than or equal to 0.25t, and
• the glass article is formed from a glass comprising:
• from greater than or equal to 55.0 mol % to less than or equal to 75.0 mol % SiO2;
• from greater than or equal to 8.0 mol % to less than or equal to 20.0 mol % Al2O3;
• from greater than or equal to 3.0 mol % to less than or equal to 15.0 mol % Li2O;
• from greater than or equal to 5.0 mol % to less than or equal to 15.0 mol % Na2O;
• and
• less than or equal to 1.5 mol % K2O,
• wherein:
• Al2O3+Li2O is greater than 22.5 mol %,
• R2O+RO is greater than or equal to 18.0 mol %,
• R2O/Al2O3 is greater than or equal to 1.06,
• SiO2+Al2O3+B2O3+P2O5 is greater than or equal to 78.0 mol %, and
• (SiO2+Al2O3+B2O3+P2O5)/Li2O is greater than or equal to 8.0.

A glass article comprising:

• a first surface;
• a second surface opposite the first surface, wherein a thickness (t) of the glass article is measured as a distance between the first surface and the second surface;
• and
• a compressive stress layer extending from at least one of the first surface and the second surface into the thickness (t) of the glass article, wherein
• a central tension of the glass article is greater than or equal to 60 MPa,
• the compressive stress layer has a depth of compression that is from greater than or equal to 0.15t to less than or equal to 0.25t, and
• the glass article has a composition at a center depth of the glass article comprising:
• from greater than or equal to 55.0 mol % to less than or equal to 75.0 mol % SiO2;
• from greater than or equal to 8.0 mol % to less than or equal to 20.0 mol % Al2O3;
• from greater than or equal to 3.0 mol % to less than or equal to 15.0 mol % Li2O;
• from greater than or equal to 5.0 mol % to less than or equal to 15.0 mol % Na2O;
• and
• less than or equal to 1.5 mol % K2O,
• wherein:
• Al2O3+Li2O is greater than 22.5 mol %,
• R2O+RO is greater than or equal to 18.0 mol %,
• R2O/Al2O3 is greater than or equal to 1.06,
• SiO2+Al2O3+B2O3+P2O5 is greater than or equal to 78.0 mol %, and
• (SiO2+Al2O3+B2O3+P2O5)/Li2O is greater than or equal to 8.0.

A glass composition comprising:

• from greater than or equal to 55.0 mol % to less than or equal to 70.0 mol % SiO2;
• from greater than or equal to 10.0 mol % to less than or equal to 20.0 mol % Al2O3;
• from greater than or equal to 3.0 mol % to less than or equal to 15.0 mol % Li2O;
• from greater than or equal to 5.0 mol % to less than or equal to 15.0 mol % Na2O;
• and
• less than or equal to 1.5 mol % K2O,
• wherein:
• Al2O3+Li2O is greater than 22.5 mol %,
• R2O+RO is greater than or equal to 18.0 mol %,
• SiO2+Al2O3+B2O3+P2O5 is greater than or equal to 78.0 mol %, and
• (SiO2+Al2O3+B2O3+P2O5)/Li2O is greater than or equal to 10.50.