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
|
摘要
通过力学性能测试、XRD物相分析、拉伸断口形貌分析、剥落腐蚀性能评估等试验,研究了时效应力对7A04铝合金二级时效力学及剥落腐蚀性能的影响。结果表明:时效应力为100～300 MPa时,7A04铝合金的强度和硬度有所增加;当时效应力为200 MPa时,合金的R_m、R_(p0.2)和布氏硬度分别达652.3 MPa、588.5 MPa和178HB,相比于无应力二级时效分别提高了4.47%、3.94%和5.95%,而塑性变化不大;随时效应力的增大,时效试样组织中MgZn_2析出相含量增加,并且其断裂方式发生改变;适当的时效应力可降低7A04铝合金剥落腐蚀敏感性,时效应力为200 MPa时,合金抗剥落腐蚀性能最优,抗剥落腐蚀等级为EA。
Effects of aging stress on the mechanical properties and exfoliation corrosion resistance of 7 A04 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 7 A04 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 7 A04 aluminum alloy reached 652.3 MPa, 588.5 MPa and 178 HB 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 MgZn_2 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 7 A04 aluminum alloy, and the alloy has the best corrosion resistance with the aging stress of 200 MPa, which reached the level of EA.
Effects of aging stress on the mechanical properties and exfoliation corrosion resistance of 7 A04 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 7 A04 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 7 A04 aluminum alloy reached 652.3 MPa, 588.5 MPa and 178 HB 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 MgZn_2 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 7 A04 aluminum alloy, and the alloy has the best corrosion resistance with the aging stress of 200 MPa, which reached the level of EA.
引文
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.
10 Lin Y C,Jiang Y Q,Zhang X C,et al.Materials and Design,2014,61,228.
11 Cao 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.
12 Guo W,Guo J Y,Wang J D,et al.Materials Science and Engineering A,2015,634,167.
13 Lin Y C,Jiang Y Q,Xia Y C,et al.Materials Science & Engineering A,2014,605,192.
14 Lin Y C,Jiang Y Q,Chen X M,et al.Materials Science and Enginee-ring A,2013,588,3.
15 Sha G,Cerezo A.Acta Materialia,2004,52(15),4503.
16 Du Z W,Sun Z M,Shao B L,et al.Materials Characterization,2006,56(2),121.
17 Xu 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.
18 Najjar D,Magnin T,Warner T J.Materials Science and Engineering A,1997,238(2),293.
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.
10 Lin Y C,Jiang Y Q,Zhang X C,et al.Materials and Design,2014,61,228.
11 Cao 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.
12 Guo W,Guo J Y,Wang J D,et al.Materials Science and Engineering A,2015,634,167.
13 Lin Y C,Jiang Y Q,Xia Y C,et al.Materials Science & Engineering A,2014,605,192.
14 Lin Y C,Jiang Y Q,Chen X M,et al.Materials Science and Enginee-ring A,2013,588,3.
15 Sha G,Cerezo A.Acta Materialia,2004,52(15),4503.
16 Du Z W,Sun Z M,Shao B L,et al.Materials Characterization,2006,56(2),121.
17 Xu 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.
18 Najjar D,Magnin T,Warner T J.Materials Science and Engineering A,1997,238(2),293.