CAJ | 학술논문

采用硬度、电导率、力学拉伸、慢应变速率拉伸试验及透射电镜等测试分析方法，研究双级时效对7085铝合金组织和性能的影响。结果表明：预时效热处理主要析出相为GP 区和η′相，预时效时间对合金硬度和电导率的影响较小。随着第二级时效时间的延长，合金的抗拉强度和屈服强度先增大后减小，电导率和抗应力腐蚀性能提高，晶界析出相由连续分布变为非连续分布。第二级时效温度越高，合金强度随时效时间的延长，降低得越显著。采用(110℃,6 h)+(160℃,12 h)双级时效热处理，合金的抗拉强度、屈服强度、伸长率及电导率分别为515 MPa、487MPa、11.7%、38%(IACS)。
채용경도、전도솔、역학랍신、만응변속솔랍신시험급투사전경등측시분석방법，연구쌍급시효대7085려합금조직화성능적영향。결과표명：예시효열처리주요석출상위GP 구화η′상，예시효시간대합금경도화전도솔적영향교소。수착제이급시효시간적연장，합금적항랍강도화굴복강도선증대후감소，전도솔화항응력부식성능제고，정계석출상유련속분포변위비련속분포。제이급시효온도월고，합금강도수시효시간적연장，강저득월현저。채용(110℃,6 h)+(160℃,12 h)쌍급시효열처리，합금적항랍강도、굴복강도、신장솔급전도솔분별위515 MPa、487MPa、11.7%、38%(IACS)。
The effect of two-step aging treatment on microstructure and properties of 7085 aluminum alloy was investigated by hardness, conductivity, mechanical testing, slow strain rate testing and transmission electron microscopy. The results show that the GP zones andη′phase are the mainly precipitation phases of pre-aging, and the pre-aging time is less impact on the hardness and electrical conductivity. The strength after two-step aging process first increases, and then decreases, while the ability of stress corrosion resistance increases with the extension of the second step of aging time. With the size of grain boundary precipitates coarsening, and the distribution of grain boundary precipitates from continuous to non-continuous. The strength of the alloy significantly decreases with the increases of the second step aging temperature. The optimal of the two-step aging process is (110℃, 6 h)+(160℃, 12 h), the tensile strength, yield strength, elongation and conductivity of alloy are 515 MPa, 487 MPa, 11.7%, 38%(IACS), respectively.