摘要
对铸态L2纯铝进行搅拌摩擦加工(FSP)处理,研究L2纯铝加工前后的显微组织,力学性能及微观断裂机理。结果表明,剧烈的塑性变形促使粗大的枝状晶显著破碎,形成细小且均匀分布的再结晶组织。搅拌摩擦加工后,L2纯铝的显微硬度提高9HV,抗拉强度和延伸率分别提高34 MPa和17%;试样的拉伸断口呈现出微孔聚合韧性断裂特征。细晶强化对材料力学性能的提高起主要作用。
Friction stir processing was applied to cast pure aluminum L2.The microstructure,mechanical properties and micro- fracture mechanism were studied before and after processing.The results show that intense plastic deformation results in significant breakup of the coarse dendrites and creates a fine,uniform recrystallized microstructure.The microhardness,tensile strength and elongation increase by 9HV,34 MPa and 17% after FSP,respectively;the surface fracture of the FSPed tensile specimen exhibits a typical ductile dimple-fracture. Grain refinement strengthening plays an important role in enhancing the mechanical properties.
出处
《兵器材料科学与工程》
CAS
CSCD
2009年第4期15-18,共4页
Ordnance Material Science and Engineering
基金
国家自然科学基金资助项目(50774059)
关键词
搅拌摩擦加工
铸态L2纯铝
显微组织
力学性能
friction stir processing
as-cast pure aluminum L2
microstructure
mechanical properties
