退火对5052铝合金搅拌摩擦加工性能的影响  

Influence of Annealing on Friction Stir Processing Properties of 5052 Aluminum Alloy

作　　者：赵金国[1] 夏祥春[2] 吴松林[3] 

机构地区：[1]西京学院机电技术系,陕西西安710123 [2]永城职业学院机电工程系,河南永城476600 [3]西京学院机械工程学院,陕西西安710123

出　　处：《热加工工艺》2016年第22期156-159,共4页Hot Working Technology

基　　金：陕西省教育厅专项科研计划项目(15JK2186);西京学院校级科研项目(XJ130247)

摘　　要：为了寻求低能耗的铝合金强化工艺,分别对5052-H34和5052-O铝合金进行了搅拌摩擦加工(FSP),利用OM、TEM和拉伸研究了搅拌摩擦加工对铝合金显微组织和拉伸性能的影响。结果表明:退火处理和搅拌摩擦加工均可降低5052-H34合金的位错密度;5052-H34铝合金经搅拌摩擦加工后伸长率提高了111.8%,但搅拌摩擦加工对5052-O铝合金的力学性能影响不明显;搅拌摩擦加工引起的动态再结晶有利于获得细小的等轴晶,从而导致晶界面积和动态应变效应增加。因此,FSP试样拉伸曲线的应力降较明显。In order to seek a strengthening process for aluminum alloywith low energy consumption, the friction stir processing （FSP） of 5052-H34 and 5052-0 alloy was conducted respectively. The effects of the FSP on the microstructure and the tensile properties of the aluminum alloy were investigated by using the OM, TEM and stretching. The results show that the dislocation density of 5052-H34 alloy can be reduced by annealing and friction stir processing; the elongation of the 5052-H34 alloy increases by 111.8% after the FSP, but the effect of friction stir processing on the mechanical properties of 5052-0 aluminum alloy is not obvious. The dynamic recrystallization caused by FSP is propitious to obtain fine equiaxed grains,which leads to the increase of grain boundary area and the dynamic strain effect. As a result, the stress drop of the tensile curve of FSP sample is obvious.

关 键 词：搅拌摩擦加工(FSP) 位错密度 伸长率 晶界面积 动态应变效应 应力降 

分 类 号：TG166[金属学及工艺—热处理]