Abstract: Effects of aging stress on the mechanical properties and exfoliation corrosion resistance of 7A04 aluminum alloy with two-stage aging were investigated by mechanical properties test, XRD analysis, tensile fracture surface analysis and exfoliation corrosion evaluation. The results indicated that the strength and hardness of 7A04 aluminum alloy increased with the aging stress of 100~300 MPa. Compared with no stress-aging condition, the tensile strength, yield strength and hardness of 7A04 aluminum alloy reached 652.3 MPa, 588.5 MPa and 178HB after aged with stress of 200 MPa, increased by 4.47%, 3.94% and 5.95% respectively, but the change of the elongation is insignificant. Additionally, with the increase of aging stress, the content of MgZn2 precipitates in the microstructure of the alloy increased, and the fracture mode of the alloy also changed. The suitable aging stress can reduce the exfoliation corrosion sensitivity of 7A04 aluminum alloy, and the alloy has the best corrosion resistance with the aging stress of 200 MPa, which reached the level of EA.
李虎, 赵君文, 王超群, 郭安, 李恒奎, 戴光泽. 时效应力对7A04铝合金二级时效力学及剥落腐蚀性能的影响[J]. 材料导报, 2019, 33(12): 2025-2029.
LI Hu, ZHAO Junwen, WANG Chaoqun, GUO An, LI Hengkui, DAI Guangze. Effects of Aging Stress on the Mechanical Properties and Exfoliation CorrosionResistance of 7A04 Aluminum Alloy with Two-stage Aging. Materials Reports, 2019, 33(12): 2025-2029.
1 Williams J C, Jr E A S. Acta Materialia, 2003, 51(19), 5775. 2 Rometsch P A, Zhang Y, Knight S. Transactions of Nonferrous Metals Society of China, 2014, 24(7), 2003. 3 Wu H P, Wang Z X, Ma Y L, et al. Journal of Chongqing University of Technology (Natural Science), 2017, 31(4), 59 (in Chinese). 吴海鹏, 王正曦, 麻彦龙, 等. 重庆理工大学学报(自然科学), 2017, 31(4), 59. 4 Heinz A, Haszler A, Keidel C, et al. Materials Science & Engineering A, 2000, 280(1), 102. 5 Pankade S B, Khedekar D S, Gogte C L. Procedia Manufacturing, 2018, 20, 53. 6 Cai B, Adams B L, Nelson T W. Acta Materialia, 2007, 55(5), 1543. 7 Peng F F, Kang F, Shu D Y, et al. Journal of Chongqing University of Technology (Natural Science), 2014, 28(10), 56 (in Chinese). 彭菲菲, 康凤, 舒大禹, 等. 重庆理工大学学报(自然科学), 2014, 28(10), 56. 8 Xu J Y, Pu J R. Hot Working Technology, 2015(8),212 (in Chinese). 徐君燕, 卜建荣.热加工工艺, 2015(8), 212. 9 Liu Y, Jiang D, Li B, et al. Materials & Design, 2014, 57(5), 79. 10Lin Y C, Jiang Y Q, Zhang X C, et al. Materials and Design, 2014, 61, 228. 11Cao S F, Pan Q L, Liu X Y, et al. The Chinese Journal of Nonferrous Metals, 2010, 20(8), 1513 (in Chinese). 曹素芳, 潘清林, 刘晓艳, 等.中国有色金属学报, 2010, 20(8), 1513. 12Guo W, Guo J Y, Wang J D, et al.Materials Science and Engineering A, 2015, 634, 167. 13Lin Y C, Jiang Y Q, Xia Y C, et al. Materials Science & Engineering A, 2014, 605, 192. 14Lin Y C, Jiang Y Q, Chen X M, et al. Materials Science and Enginee-ring A, 2013, 588, 3. 15Sha G, Cerezo A.Acta Materialia, 2004, 52(15), 4503. 16Du Z W, Sun Z M, Shao B L, et al. Materials Characterization, 2006, 56(2), 121. 17Xu T D, Li Q F, Yang S L. Journal of Iron and Steel Research, 2001, 13(4), 28 (in Chinese). 徐庭栋, 李庆芬, 杨尚林.钢铁研究学报, 2001, 13(4), 28. 18Najjar D, Magnin T, Warner T J.Materials Science and Engineering A, 1997, 238(2), 293.
渝公网安备50019002502923号 版权所有：《材料导报》编辑部
2019, Vol. 33 
