湖南大学学报（自然科学版）2016，Vol.43Issue(12)：17-23,7.
往复镦挤2 A66铝锂合金室温拉伸性能及韧化机制∗
Room Temperature Tensile Mechanical Property and Toughening Mechanism of 2A6 6 Al-Li Alloy Processed by Repetitive Upsetting and Extrusion
摘要
Abstract
Repetitive upsetting and extrusion (RUE)was firstly carried out on 2A66 Al-Li alloy.Elec-tron back-scatter diffraction (EBSD),transmission electron microscopy (TEM),scan electron microscopy (SEM),and room temperature tensile testing were then performed to investigate the microstructure char-acteristics and mechanical properties of 2A66 Al-Li alloy.The results showed that RUE was effective in refining the microstructure of 2A66 Al-Li alloy.With the increase of RUE pass numbers,high density dis-locations in 2A66 Al-Li alloy gradually transformed to dislocation walls and subgrain boundaries,distribu-tion of large second phase (θ′)became more homogenous,and a part ofβ′dispersion dissolved into the alu-minum-lithium alloy matrix.After RUE processing,the ductility improved greatly with a modest reduction in strengthening,as the toughening of the alloy was mainly attributed to the change of dislocation,thehomogeneity and fragment ofθ′phase,and the dissolution ofβ′dispersion.关键词
塑性变形/2A66 铝锂合金/韧化/微观组织Key words
plastic deformation/2A66 Al-Li alloy/toughening/microstructure分类
矿业与冶金引用本文复制引用
滕杰,许娟,高文理,陆政..往复镦挤2 A66铝锂合金室温拉伸性能及韧化机制∗[J].湖南大学学报（自然科学版）,2016,43(12):17-23,7.基金项目
国家自然科学基金资助项目(51271076,51474101,51574118),National Natural Science Foundation of China (51271076,51474101,51574118) （51271076,51474101,51574118）
