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

2015; Wiley; Volume: 18; Issue: 2 Linguagem: Inglês

10.1002/adem.201500165

1527-2648

Shaofan Zhao, Na Chen, Pan Gong, Kefu Yao,

Metallic Glasses and Amorphous Alloys

Using copper mold suction casting, high Ti content alloys of Ti 50 Zr 16 Be 24 Ni 10 , Ti 50 Zr 20 Be 20 Ni 10 , and Ti 55 Zr 15 Be 20 Ni 10 are fabricated in bulk metallic glasses (BMGs) with the critical diameters (D c ) of 10, 6, and 5 mm, respectively. In particular, the Ti 50 Zr 16 Be 24 Ni 10 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 Ti 50 Zr 16 Be 24 Ni 10 BMG exhibits a specific strength of 3.87 × 10 5 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.