Compression tests were conducted at room and cryogenic temperatures to investigate the lowtemperature plasticity in Mg-3Al-1Zn alloy. The strain to failure and fracture strength in Mg3Al-1Zn alloy increase by 21.4% and 51.6% from room to cryogenic temperature. Using a
quasi-in-situ EBSD method, it is found that {10 1̅ 2} tension twins dominate at room
temperature, while abundant (101̅2)-(011̅2) twin-twin interactions are observed at cryogenic
temperature. Multiple slips, including pyramidal and basal slips, occur in twin-twin interactions,
enhancing the strain to failure and flow stress at cryogenic temperature. The high dislocation
density near twin-twin interactions boundaries would contribute to the high hardening rate and
flow stress at cryogenic temperature. This work would provide a novel way to enhance
plasticity in magnesium alloys and gain an in-depth understanding of twin-twin interactions.