Abstract
Abstract Low flame resistance and inferior mechanical properties are critical issues in widening applications of wrought magnesium alloys as a structural component. To address these issues, the present authors attempted to develop a flame-resistant magnesium–silver-based sheet alloy with excellent room temperature (RT) formability. It was found that the ignition temperature of Mg–1.5 wt%Ag–x wt.%Ca alloy was significantly increased with increasing the Ca content up to 2 wt%. The 2 wt% Ca-containing alloy exhibited a non-flammability characteristic upon 1000 °C due to the formation of compact and dense CaO film on the surface. Strength and in-plane yield anisotropy were enhanced with increasing the Ca content, which were mainly associated with a finer microstructure and a denser distribution of Mg2Ca second phase particles. In contrast, stretch formability was decreased with increasing the Ca content due to an increased number of the Mg2Ca particles. A compositionally optimized Mg–1.5Ag–1Ca (wt.%) alloy showed a high ignition temperature of 912.5 °C with a large index Erichsen value of 7.8 mm at RT.
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