Strain hardening at elevated temperatures induced by dynamic crystallization of an Al88Ni4Y8 amorphous alloy

Tensile tests were carried out on amorphous Al88Ni4Y8 ribbons at room and high temperatures. The fracture strength at room temperature was 889 MPa, with an elastic strain of ∼1.35%. At 200 °C the tensile strength was 816 MPa, 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.