The high-temperature tensile tests were conducted on elevator safety Gear with Cu-1.9 Be-0.25 Co alloy after 780 ℃×4 h solid solution+320 ℃×8 h aging treatment.The stress-strain curve and the change rule of mechanical properties of alloy under different testing conditions were obtained

and the microstructure and tensile fracture morphology of the alloy were observed through optical microscope and scanning electron microscope. The results reveal that temperature has a significant effect on the tensile strength and elongation of the aged Cu-1.9 Be-0.25 Co alloy under high temperature conditions. As the tensile temperature increases

tensile strength of the alloy is gradually decreased from 262 MPa to 24.5 MPa

and the elongation and reduction of area are firstly increased and then decreased

which reach the maximum of 129.5% and 99% at 730 ℃

respectively

and the maximum reduction of area continues to decline until 780 ℃. The fracture mechanism of the alloy is transformed from the composite fracture mechanism of intergranular brittle fracture+local ductile fracture at 500 ℃ to ductile fracture at 600 ℃

730 ℃

780 ℃ and 830 ℃.