低温变形对2A14铝合金组织性能影响

Effect of Low Temperature Deformation on Microstructure and Properties of 2A14 Aluminum Alloy

提出了低温变形与热处理协同的2A14铝合金强韧化新方法,借助透射电镜、扫描电镜、金相显微镜、拉伸试验机等测试手段对比分析了室温和超低温变形工艺对2A14铝合金组织性能的影响。结果显示:与室温变形相比,超低温变形与热处理协同能够大幅提升合金综合力学性能。当超低温变形量达到20%,合金内部位错密度上升,第二相粒子尺寸更小,分布更为均匀,晶粒细化显著,合金综合力学性能达到最高,抗拉强度为474.5 MPa,屈服强度为426.5 MPa,延伸率为11.6%。

A new method for strengthening and toughening 2 A14 aluminum alloy with low temperature deformation and heat treatment is proposed.The effects of room temperature and cryogenic temperature deformation process on the microstructure and properties of 2 A14 aluminum alloy were analyzed by transmission electron microscopy,scanning electron microscopy,metallographic microscope and tensile testing machine.The results show that compared with the room temperature deformation,the cryogenic temperature deformation and heat treatment synergistically can greatly improve the overall mechanical properties of the alloy.When the cryogenic temperature deformation reaches 20%,the internal dislocation density of the alloy increases,the second phase particle size is smaller,the distribution is more uniform,the grain refinement is remarkable,the alloy has the highest comprehensive mechanical properties.And the tensile strength is 474.5 MPa.The yield strength is 426.5 MPa and the elongation is 11.6%.