摘要
采用慢应变速率拉伸(SSRT)测试法及扫描电镜(SEM)与透射电镜(TEM)分析手段,研究了预变形量及应变速率对5083铝合金在空气和3.5%NaCl溶液中应力腐蚀开裂(SCC)行为的影响。结果表明:在空气中,5083铝合金几乎不发生SCC现象,其断口均呈现韧性断裂形貌;在3.5%NaCl溶液中,5083铝合金具有SCC敏感性,其断口呈现局部沿晶界或相界断裂形貌,随着应变速率的减小,应力腐蚀敏感指数(ISSRT)增大,当应变速率减至1×10-6s-1时,其应力腐蚀断口呈现典型的解理脆断特征;(Mg5Al8)等第二相析出及预变形后位错增多是导致5083铝合金SCC敏感性增大的主要原因。
The effect of pre-deformation and strain rate on the SCC behavior of aluminum alloy 5083 in air and 3. 5% NaCl solution were studied by using SSRT, scanning electron microscopy （SEM） and transmission electron microscopy（TEM） analyses. The results indicated that aluminum alloy 5083 was almost not susceptible to SCC in air, all fracture surface showed ductile fracture morphology. The alloy was susceptible to SCC in 3. 5% NaCl solution, and fracture morphology was showed partially along grain boundaries or phase boundary, with the decrease of strain rate, ISSRT increased, When strain rate was reduced to 1 × 10^-6 s^-1 , the typical characteristics of brittle cleavage fracture were showed. The second phase such as 13 （Mg5Al8） precipitation and diclocation increased after predeformation were the main reasons leading to increasing SCC suscetibility of 5083 aluminum alloy.
出处
《腐蚀与防护》
CAS
北大核心
2009年第11期794-796,共3页
Corrosion & Protection
基金
广东省佛山市产学研专项基金资助(2006b001)
关键词
5083铝合金
慢应变速率拉伸
预变形
应力腐蚀开裂敏感性
aluminum alloy 5083
slow strain rate test
pre-deformation
stress corrosion cracking susceptibility
