摘要
对6016铝合金在室温停滞过程的自然时效效应进行了系统的研究,测试了不同热处理制度下6016铝合金的力学性能,利用OM、SEM和TEM表征了其微观组织结构。结果表明,相比于未预时效和60℃预时效,80℃和100℃的预时效温度使1.6 mm厚板材表现出良好的时效稳定性;经预时效后,基体内析出原子团簇(pre-β″);人工时效处理过程中,pre-β″作为形核点,析出大量与基体半共格的β″强化相,同时在晶界处形成PFZ区;随着预时效温度的升高,板材人工时效后的强度不断提高,屈服强度的增量在40~80 MPa;80℃×4 h的预时效工艺可以使试验板材获得最优的综合性能,在150天内性能稳定,同时具有最大的烘烤强度增量。
Natural aging effect of 6016 aluminum during parking process under room temperature was investigated.The mechanical properties under different heat treatments were tested,the microstructure was characterized by using OM,SEM and TEM.The results indicate that the 1.6 mm thickess plate material under pre-aging at 80℃and 100℃has better aging stability compared to the plates un-pre-aged and pre-aged at 60℃.The pre-β″phase precipitates after pre-aging treatment and becomes nucleation ofβ″phase,which is semi-coherent with the matrix,and the PFZ zone is formed near the grain boundaries.With the increase of pre-aging temperature,the strength of artificial aging treatment is increased and the yield strength has an increment of 40-80 MPa.The best comprehensive properties are achieved under pre-aging at 80℃for 4 h and are stable with 150 days,which has the highest strength increment.
作者
白星良
Bai Xingliang(School of Metallurgy and Automotive Engineering,Shandong Vocational College of Industry,Zibo Shandong 255000,China)
出处
《金属热处理》
CAS
CSCD
北大核心
2023年第12期123-128,共6页
Heat Treatment of Metals
基金
2020年淄博市校城融合项目(2020SNTP0058)。
