抄録
Bulk metallic glasses (BMG) are finding increasing structural and impact related applications due to their high elastic limit (∿2%), high strength (∿2GPa) and potential for large deformation through localized shear. However, BMGs pose considerable challenges to impact testing due to their inherent low strain to failure induced by strain localization. This paper describes recent advances in impact testing of BMGs using a modified split Hopkinson (Kolsky) pressure bar. Results are presented for the high-strain-rate behavior of a bulk metallic glass, Vitreloy 1 (Zr_<41.25>Ti_<13.75>Ni_<10>Cu_<12.5>Be_<22.5>). The material exhibits strong rate sensitivity at temperatures above its glass transition temperature under quasi-static loading but remains rate insensitive under dynamic loading conditions.
