作　　者： ; ; ; ; ; ;

机构地区： 沈阳航空航天大学

出　　处： 《轻合金加工技术》 2013年第6期54-57,62,共5页

摘　　要： 针对某新型铝-锂合金搅拌摩擦焊接头进行了宏观、微观金相组织分析以及显微硬度试验和分析。试验结果表明,焊核区是由等轴细小的再结晶晶粒组成,轴肩影响区的晶粒形貌同焊核区的类似,只是晶粒尺寸略大一些,热机影响区呈现狭长、弯曲的晶粒组织,左右两侧形貌不对称,热影响区晶粒形状与母材的类似,但较母材的粗大。焊接接头硬度值基本成W型分布,硬度最大值接近母材平均硬度值的90%,出现在焊缝上部的轴肩影响区处,并且焊缝上部的硬度水平要比下部的高。最小值出现在热影响区,达到了母材硬度值的70%以上。另外,焊核区硬度较高的,达到了母材的83%以上,同时后退侧的硬度要比前进侧的高。 The friction stir welded joint of a new type A1-Li alloy has been investigated by macroscopic and microscopic metallographic analysis and micro hardness test. The investiga- tion results indicate that the welding nucleus zone is composed by small isometric re-crystal- lized grains ; the morphology of weld-affected zone at axis shoulder is similar to that of weld nucleus zone, but crystal size is larger slightly; the thermo-mechanical affected zone presents winding, long and thin crystals, but the morphology are distributed asymmetrically at left and right side ; the crystal form at thermo-mechanical affected zone is similar to that of the matrix material, but the grain size is a little larger than that of matrix metal. The hardness curve at weld joint is distributed in a form of W basically. The maximum hardness at the upper area of axis shoulder zone is nearly to 9.0% of that at matrix metal which is higher than that at lower area. The minimum hardness appears at heat affected zone and reached to 70% and higher of that at matrix metal. In addition, the hardness at weld nucleus zone reached to 83% and higher of that at matrix metal. Meanwhile, the hardness of drawing-back side is higher than that of advancing side.

关 键 词： 铝 锂合金 搅拌摩擦焊 金相分析 硬度

领　　域： [金属学及工艺] [一般工业技术] [金属学及工艺]