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采用一种新的螺杆挤压法以AA6063合金和工业纯Mg混合颗粒为原料制备Al/Mg双金属复合材料。加入铝合金中的镁合量最高可达到12.5%(质量分数)。所制备复合材料由细小晶粒组织组成。其显微组织中除有原料中的物相外,还观察到由γ-Mg17Al12包围的岛状Al2Mg3金属间合物。复合材料的强度随Mg含量的增加逐渐增高。含Mg为10%复合材料的极限抗拉强度最高,超过350 MPa。断裂表面分析结果表明,增加Mg含量导致材料发生较严重的脆性断裂及断裂机制的较小变化。因此,应对挤压工艺条件进行进一步优化。
A new screw extrusion method was used to prepare Al / Mg bimetallic composites with AA6063 alloy and industrial pure Mg mixed particles as raw materials. Join the aluminum alloy in the maximum amount of up to 12.5% (mass fraction). The prepared composite material is composed of fine crystal grains. In addition to the microstructure of the raw material phase, also observed by γ-Mg17Al12 island surrounded by Al2Mg3 intermetallics. The strength of composites increases with the increase of Mg content. The ultimate tensile strength of 10% Mg-containing composites is highest, exceeding 350 MPa. Fracture surface analysis results show that increasing Mg content leads to more serious brittle fracture and smaller change of fracture mechanism. Therefore, the extrusion process conditions should be further optimized.