(湖南大學(xué)材料科學(xué)與工程學(xué)院， 長沙 410082)
摘 要: 采用固液混合鑄造技術(shù)制備了Al-10Mn合金坯料， 將坯料進(jìn)行熱擠壓加工，研究了加熱溫度對擠壓加工的影響及傳統(tǒng)鑄造、 固液混合鑄造以及固液混合鑄造坯料的熱擠壓加工制備的Al-10Mn合金的顯微組織和力學(xué)性能。結(jié)果表明： 固液混合鑄造合金的析出相細(xì)小、 均勻、 圓整， 抗拉強(qiáng)度提高到130 MPa， 熱擠壓后合金的抗拉強(qiáng)度增加到181 MPa； 當(dāng)坯料加熱溫度為600 ℃時(shí)， 擠壓加工的合金具有最好的力學(xué)性能和較為均勻的顯微組織； 當(dāng)坯料加熱溫度為570 ℃時(shí)， 坯料則不能順利擠出； 而當(dāng)坯料加熱溫度高于610 ℃時(shí)， 合金力學(xué)性能大幅降低。
關(guān)鍵字: Al-Mn合金； 鑄造； 固液混合鑄造； 擠壓
（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
