Microstructure and Cryogenic Tensile Fracture Behavior of an Al-Li-Zn-Zr Alloy
The microstructure and cryogenic tensile properties of an Al-Li-Zn-Zr alloy in different aging conditions have been studied. The temperature dependence of the tensile properties of the alloy were evaluated from ambient to liquid nitrogen temperature in the long transverse direction. The results show that the tensile strength and elongation of the alloy are much increased with the decrease of test temperature. The variation in tensile fracture mode and deformation behavior are proved to depend on the aging conditions and test temperature closely. The effect of microstructure on tensile deformation and fracture behavior of the alloy at room and cryogenic temperatures have been discussed. δ′ particles are the major fractor to the improvement of ductility for the alloy at low temperatures.
KeywordsSlip Band Cryogenic Temperature Homogeneous Slip Decrease Test Temperature Tensile Fracture Mode
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