Tensile tests were carried out on amorphous Al 88 Ni 4 Y 8 ribbons at room and high temperatures. The fracture strength at room temperature was 889MPa, with an elastic strain of ∼1.35%. At 200°C the tensile strength was 816MPa, with a total strain of 16.8%. Modulated differential scanning calorimeter results revealed the existence of a “hidden” glass transition, which resulted in viscous flow and large plastic deformation. Dynamic crystallization during tensile tests accounted for the observed strain hardening behavior.