MECHANICAL PROPERTIES OF BINARY Al-Li ALLOYS AT CRYOGENIC TEMPERATURE
二元Al-Li合金的低温力学性能

The mechanical properties of pure aluminum,Al-1Li and Al-2.5Li alloyshave been investigated from room temperature to 77K.The ultimate tensile strength andelongation increased much with the decrease of test temperature,whereas the yieldstrengths show a slight increment or even unchangeableness.It has also been found that thework hardening capacity of alloys is also much improved at cryogenic temperature.The ag-ing temperature is scarcely related to the increase in tensile properties at low temperatures.Compared to room temperature,fracture surface shows greater deformation traces beforecracking of cryogenic temperature.