Abstract: Effects of cryogenics on microstructure and subsequent precipitation behavior of non-equilibrium solidified Mg-6Al-1Y alloy were investigated by spray casting and aging treatment. The results show that the microstructure of quenched alloy is composed of fine α-Mg grain with undeve-loped petal-like shape, divorced eutectic β phase at grain boundary and Al2Y rare earth phase. The micro-stress and plastic deformation arising from cryogenics are beneficial to the grain refinement and formation of high density dislocation structure. After aging with 250 ℃/4 h, discontinuous precipitation occurs at the grain boundary of quenched alloy, accompanied by the preferential growth of needle-plate β phase with ideal coherent relationship with the matrix. Cryogenics accelerates the precipitation of β phase, and favors the continuous precipitation at grain interior with short rod-like shape. The resultant hardness reaches 77.2HV, which is 23.1% higher than that of the initial rapidly cooled alloy.
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2023, Vol. 37 
