CAJ | 학술논문

采用晶间腐蚀性能测试及透射电镜研究冷变形及退火对5E06铝板晶间腐蚀性能的影响规律。结果发现：5E06铝板的晶间腐蚀性能与β相的分布、形貌和析出量密切相关。当冷变形量低于40%时，β相较易在晶界析出达到连续而使合金晶间腐蚀性能恶化；当变形量增加到55%以上时，经稳定化退火后β相在晶界不容易连续，5E06铝板晶间腐蚀性能良好。进一步的敏化试验表明，经55%~80%冷变形的5E06铝板在120℃稳定化退火的效果并不理想，而220℃的稳定化退火由于获得了比较均匀的亚晶组织且β相在晶界/亚晶界断续分布并一定程度上降低基体中镁原子的过饱和度，可使稳定化退火态5E06铝板在长期使用过程中晶间腐蚀性能不发生明显退化。
채용정간부식성능측시급투사전경연구랭변형급퇴화대5E06려판정간부식성능적영향규률。결과발현：5E06려판적정간부식성능여β상적분포、형모화석출량밀절상관。당랭변형량저우40%시，β상교역재정계석출체도련속이사합금정간부식성능악화；당변형량증가도55%이상시，경은정화퇴화후β상재정계불용역련속，5E06려판정간부식성능량호。진일보적민화시험표명，경55%~80%랭변형적5E06려판재120℃은정화퇴화적효과병불이상，이220℃적은정화퇴화유우획득료비교균균적아정조직차β상재정계/아정계단속분포병일정정도상강저기체중미원자적과포화도，가사은정화퇴화태5E06려판재장기사용과정중정간부식성능불발생명현퇴화。
The effects of cold deformation and annealing on the intergranular corrosion property of 5E06 aluminium alloy plates were investigated by intergranular corrosion property tests and transmission electron microscope (TEM). The results show that the intergranular corrosion property of 5E06 aluminium alloy plates has close relationship with the distribution, morphology and quantity ofβphase. When the cold deformation is under 40%,βphase is easy to precipitate continuously at grain boundaries which will worsen the intergranular corrosion property. When the cold deformation exceeds 55%,βphase is not easy to achieve succession after stabilizing annealing and the 5E06 aluminum alloy plates have favorable intergranular corrosion property. Sensitization tests indicate that the effect of stabilizing at 120℃is not desirable for 5E06 aluminum alloy plates at cold deformation of 55%-80%, whereas the aluminum alloy plates annealed at 220 ℃ can obtain homogeneous subgrains and β phase distributes discretely at grain boundaries and subgrain boundaries which can reduce the degree of supersaturation to some extent. Therefore, the intergranular corrosion property of 5E06 aluminum alloy plates at stabilizing annealing states won’t degenerate obviously in the long-term using process.