Tensile Property of Al-Mg-Sc-Zr Alloy at Cryogenic Temperature

Abstract

The tensile property and fracture characteristic of Al‐Mg‐Sc‐Zr alloy have been investigated at 77 K, 123 K, 173 K, 223 K and 300 K respectively. Both the strength and elongation improved with decreasing temperature from 300 K to 77 K, particularly between 123 K and 77 K. However, the reduction of area exhibited a maximum at around 173 K. The fractographs of tensile specimens show a completely dimple‐type ductile mode of fracture at 77 K and mixed type of fracture at 300 K, and the primary Al3(Sc,Zr) and Al6(Mn,Fe) phases are responsible for void and crack initiation at their interface with the matrix at cryogenic temperature.