(湖南大学材料科学与工程学院， 长沙 410082)
摘 要: 采用固液混合铸造技术制备了Al-10Mn合金坯料， 将坯料进行热挤压加工，研究了加热温度对挤压加工的影响及传统铸造、 固液混合铸造以及固液混合铸造坯料的热挤压加工制备的Al-10Mn合金的显微组织和力学性能。结果表明： 固液混合铸造合金的析出相细小、 均匀、 圆整， 抗拉强度提高到130 MPa， 热挤压后合金的抗拉强度增加到181 MPa； 当坯料加热温度为600 ℃时， 挤压加工的合金具有最好的力学性能和较为均匀的显微组织； 当坯料加热温度为570 ℃时， 坯料则不能顺利挤出； 而当坯料加热温度高于610 ℃时， 合金力学性能大幅降低。
关键字: Al-Mn合金； 铸造； 固液混合铸造； 挤压
（College of Materials Science and Engineering,
Hunan University, Changsha 410082, China）
Abstract: The Al-10Mn alloys were prepared by the solid-liquid mixed casting process and subsequent hot extrusion process, and the microstructures and mechanical properties were investigated. The influence of heating temperature on the extruding process was also studied. The results show that the precipitated phases of solid-liquid mixed casting billets are fine, uniformity and near spherical shape, and its tensile strength is improved to 130 MPa. The tensile strength of the billets after subsequent hot extrusion process is greatly improved to 181 MPa. When the heating temperature of billets is 600 ℃, the alloys produced by hot extrusion process have the best mechanical properties and microstructures. They can not be extruded successfully at below 570 ℃, while their mechanical properties decrease greatly at above 610 ℃.
Key words: Al-Mn alloy; casting; solid-liquid mixed casting; extrusion
