Centimeter-Sized Quaternary Ti-Based Bulk Metallic Glasses with High Ti Content of 50 at%

Using copper mold suction casting, high Ti content alloys of Ti₅₀Zr₁₆Be₂₄Ni₁₀, Ti₅₀Zr₂₀Be₂₀Ni₁₀, and Ti₅₅Zr₁₅Be₂₀Ni₁₀ are fabricated in bulk metallic glasses (BMGs) with the critical diameters (D_c) of 10, 6, and 5 mm, respectively. In particular, the Ti₅₀Zr₁₆Be₂₄Ni₁₀ BMG is the first centimeter-scale high Ti content BMG with Ti concentration as high as 50 at%. In addition, these high Ti content BMGs exhibit high specific strength and apparent plastic strain. Especially, the Ti₅₀Zr₁₆Be₂₄Ni₁₀ BMG exhibits a specific strength of 3.87 × 10⁵ N m kg^-1 and a plastic strain of 5.7 ± 0.5%. Our results indicate that a combination of lower Zr and higher Be contents promotes glass formation in the Ti-Zr-Be-Ni alloy system. The developed Ti-based BMGs with high specific strength provide potentials for engineering applications.