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The microstructure and mechanical properties of Mg-Zn-Ho-Zr alloys have been investigated in detail.The grain size of the as-cast Mg-Zn-Ho-Zr alloy was greatly decreased by the addition of Ho,and the grain growth during solution treatment was suppressed by Mg-Zn-Ho phases formed at grain boundaries.These thermally stable Mg-Zn-Ho phases could not completely dissolve into the matrix during solution treatment,and the strengthening effect of solution-plus-ageing treatment weakened.The addition of Ho can greatly enhance the high-temperature elongation of the Mg-Zn-Ho-Zr alloy,but the increase of high-temperature tensile strength was just a little.
The microstructure and mechanical properties of Mg-Zn-Ho-Zr alloys have been investigated in detail. The grain size of the as-cast Mg-Zn-Ho-Zr alloy was greatly decreased by the addition of Ho, and the grain growth during solution treatment was suppressed by Mg-Zn-Ho phases formed at grain boundaries. The thermally stable Mg-Zn-Ho phases could not completely dissolve into the matrix during solution treatment, and the strengthening effect of solution-plus-aging treatment weakened. addition of Ho can greatly enhance the high-temperature elongation of the Mg-Zn-Ho-Zr alloy, but the increase of high-temperature tensile strength was just a little.