AA5182-O铝拼焊板焊缝晶粒尺寸对力学性能的影响  

Effect of grain size on mechanical properties of AA5182-O aluminum alloy tailor welded blanks

作　　者：陈水生[1] 林建平[2] 刘景[2] 

机构地区：[1]河南理工大学机械与动力工程学院,焦作454000 [2]同济大学能源与工程学院,上海201804

出　　处：《塑性工程学报》2016年第3期68-71,共4页Journal of Plasticity Engineering

基　　金：河南省教育厅科学技术研究重点项目(14A460013);河南省科技攻关计划资助项目(142102210130)

摘　　要：为确定晶粒直径与力学性能之间的量化关系,用摩擦搅拌焊(Friction stir welding,FSW)将1.1mm厚的铝合金AA5182-O制作成拼焊板。利用单向拉伸试验获得焊缝和母材的屈服强度;利用显微硬度试验获得横截面显微硬度分布;利用金相分析获得平均晶粒直径。基于经典的晶粒直径与力学性能关系,确定了Hall-Petch方程待定参数。结果发现,焊缝的屈服强度和显微硬度均高于母材;焊缝的平均晶粒直径显著小于母材,分别为5μm和80μm。母材和焊缝的Hall-Petch常数分别为120MPa/107.33MPa·μm1/2和55.33MPa/68.57MPa·μm^(1/2)。To determine the relationship between the grain size of a material and the mechanical properties, the friction stir welding （FSW） was used to make AA5182-O aluminum alloy tailor welded blanks （TWBs） of similar material combination. The tensile tests and the hardness tests were conducted for the stir zone and the base material of the TWBs to gain their yield strengths and the Vickers hardness values, respectively. The average grain diameters were obtained by the metallographic analysis. The required parameters for the Hall-Petch equation were calculated based on the grain sizes and the mechanical properties obtained previously. The results show that the yield strength and the microhardness from the stir zone are higher than those from the base material. The average grain size of the base material is larger than that of the stir zone, are 80μm and 5μm, respectively. The HaU-Petch pa rameters of the base material and the stir zone are 120MPa/107.33MPa μm1/2 and 55.33MPa/68.57MPa μm1/2 , respectively.

关 键 词：拼焊板 晶粒直径 摩擦搅拌焊 金相分析 

分 类 号：TG146.21[一般工业技术—材料科学与工程] TG401[金属学及工艺—金属材料]