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研究了铸态和挤压态Mg-Mn-Zn合金的微观组织、力学性能和在模拟人体体液中的腐蚀行为。结果表明:铸态Mg-Mn-Zn合金的平均晶粒尺寸为300μm;而挤压后Mg-Mn-Zn合金的平均晶粒尺寸降低为9μm。挤压态与铸态Mg-Mn-Zn合金相比,抗拉强度由174.5MPa提高到280.2MPa,屈服强度由43.6MPa提高到246.5MPa,伸长率达到21.6%。铸态Mg-Mn-Zn合金断口呈脆性断裂,挤压态合金为韧性断裂。挤压态Mg-Mn-Zn合金的耐蚀性能也明显高于铸态Mg-Mn-Zn合金。
The microstructure, mechanical properties and corrosion behavior of Mg-Mn-Zn alloy in as-cast and extruded state were studied. The results show that the average grain size of as-cast Mg-Mn-Zn alloy is 300μm, while the average grain size of Mg-Mn-Zn alloy after extrusion is reduced to 9μm. Compared with the as-cast Mg-Mn-Zn alloy, the tensile strength increased from 174.5 MPa to 280.2 MPa, the yield strength increased from 43.6 MPa to 246.5 MPa, and the elongation reached 21.6%. The fracture of as-cast Mg-Mn-Zn alloy shows brittle fracture and the as-extruded alloy is ductile fracture. The corrosion resistance of extruded Mg-Mn-Zn alloy is also significantly higher than that of as-cast Mg-Mn-Zn alloy.