时效温度对冷轧2A97铝锂合金拉伸性能和晶间腐蚀敏感性的影响  

Effect of aging temperature on tensile properties and intergranular corrosion sensitivity of cold rolled 2A97 Al-Li alloy

作　　者：李梦琪 王芝秀 李海[1,2] Li Mengi;Wang Zhixiu;Li Hai(School of Materials Science and Engineering,Changzhou University,Changzhou Jiangsu 213164,China;Jiangsu Key Laboratory of Materials Surface Science and Technology,Changzhou University,Changzhou Jiangsu 213164,China)

机构地区：[1]常州大学材料科学与工程学院,江苏常州213164 [2]常州大学江苏省材料表面科学与技术重点实验室,江苏常州213164

出　　处：《金属热处理》2024年第11期209-215,共7页Heat Treatment of Metals

基　　金：国家自然科学基金(52171029,51671038)。

摘　　要：通过拉伸测试、晶间腐蚀测试、扫描电镜和透射电镜观察,研究了时效处理(150~210℃,1 h)对(525℃×1 h)固溶处理+70%压下量冷轧后的2A97铝锂合金拉伸性能和晶间腐蚀敏感性的影响。结果表明,随时效温度的升高,合金强度先增大后减小,伸长率不断减小;腐蚀类型由均匀腐蚀转为点蚀,最大腐蚀深度逐渐增加,这与T_(1)相和θ′相在晶内析出,同时析出相在晶界处断续分布有关。时效温度为180℃时,合金获得高强度(597、540 MPa)、较高伸长率(6.9%),且无晶间腐蚀敏感性。Effect of aging treatment(150-210℃,1 h)on the tensile properties and intergranular corrosion sensitivity of 2A97 Al-Li alloy after solid solution treatment(525℃×1 h)and 70%reduction cold rolling was investigated by tensile test,intergranular corrosion test,scanning electron microscopy and transmission electron microscopy.The results show that with the increase of aging temperature,the strength of the alloy increases first and then decreases,and the elongation decreases continuously.The corrosion type changes from uniform corrosion to pitting corrosion and the maximum corrosion depth gradually increases,which is related to the precipitation of T_(1) phase andθ′phase in the grains,and the intermittent distribution of precipitated phase at the grain boundary.When the aging temperature is 180℃,the alloy can obtain high strength(597,540 MPa),high elongation(6.9%),and no intergranular corrosion sensitivity.

关 键 词：2A97铝锂合金 时效温度 拉伸性能 晶间腐蚀敏感性 

分 类 号：TG146.21[一般工业技术—材料科学与工程]