This study explores microstructure and mechanical properties of extruded Mg-3Al-1Ag alloy under varying temperatures and pre-compression. Higher extrusion temperatures caused grain coarsening and strength reduction, while the tensile yield strength (175 MPa), ultimate tensile strength (272 MPa) and elongation (22.7%) are best at 300°C via synergistic grain boundary strengthening, dislocation accumulation, and solute effects. Pre-compression introduced <110> tensile twins that enhanced tensile strength through dual mechanisms: grain refinement and crystallographic reorientation promoting pyramidal II <c+a> slip activation. Compared to direct tension, pre-compressed specimens showed distinct yielding governed by low-stress detwinning rather than conventional slip. The work reveals twin-induced texture modifications critical for activating non-basal slip, guiding magnesium alloy optimization through twin engineering.
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