材料工程2025，Vol.53Issue(9)：82-90,9.DOI:10.11868/j.issn.1001-4381.2023.000365
电弧增材制造2319铝合金析出相分布及强化机理
Precipitated phase distribution and strengthening mechanism of 2319 aluminum alloy deposited by wire arc additive manufacturing
摘要
Abstract
The mechanical properties of wire-arc additive manufactured(WAAM)2319 aluminum alloy are significantly influenced by the distribution of precipitates.However,the non-equilibrium solidification microstructure under cold metal transfer(CMT)and its evolution mechanism during heat treatment remain unclear.2319 aluminum alloy specimens are fabricated using CMT-ed WAAM,with some subjected to T6 heat treatment.The distribution of precipitates in the upper,middle,and lower regions of the specimens is systematically investigated before and after heat treatment to elucidate their correlation with mechanical properties and the underlying strengthening mechanisms.The results indicate that the as-deposited specimens exhibit an average tensile strength of 175 MPa.The lower region near the substrate,which contains the highest volume fraction(20.8%)of coarse θ phases,demonstrates the greatest tensile strength(192 MPa).After T6 heat treatment,the volume fraction of θ phases in the upper,middle,and lower positions of the samples decreases by about 80%.Meanwhile,a large number of small needle-like θ' phases are formed in the matrix,and these dispersed θ' phases play a major strengthening role,making the average tensile strength of the sample reach 365 MPa.Both as-deposited and heat-treated samples exhibit three strengthening mechanisms:precipitation strengthening,solid solution strengthening,and grain refinement strengthening.The substantial strength improvement in heat-treated samples primarily originates from precipitation strengthening induced by the θ' phases.关键词
电弧增材制造/2319铝合金/析出相分布/强化机理Key words
wire arc additive manufacturing/2319 aluminium alloy/precipitated phase distribution/strength-ening mechanism分类
矿业与冶金引用本文复制引用
刘圣心,王磊磊,吕飞阅,高奇玉,占小红..电弧增材制造2319铝合金析出相分布及强化机理[J].材料工程,2025,53(9):82-90,9.基金项目
国防基础科研计划项目(JCKY2020605C006) （JCKY2020605C006）
