摘要
用恒伸长速率试验和电镜，研究了不同镁含量的铝镁铸造合金在３．０％ＮａＣｌ水溶液中的应力腐蚀行为．研究结果表明，镁含量增加，合金的强度增加，应力腐蚀敏感性增大，低镁且添加一定的硅的铝镁合金经Ｔ４处理，具有较高的机械性能及较好的抗应力腐蚀性能．ｍ（Ｍｇ）∶ｍ（Ｓｉ）＞１．７３时，合金中过剩Ｍｇ在晶界上偏聚，加速应力腐蚀过程．
Stress corrosion behavior of casting Al Mg alloy which contained different Mg contents in 3.0%NaCl solution were investigated by means of constant elongation rate testing(CERT) and electron microscope. The results indicated that the strength and the SCC susceptibility of the alloy increased with the increase of Mg content. Al Mg alloy containing proper Mg and Si had higher mechanical properties and lower SCC susceptibility. When m (Mg)∶ m (Si)>1.73 in Al Mg alloy,Mg segregated in grain boundary and Mg grain boundary segregation accelerated the stress corrosion of alloy.
出处
《中南工业大学学报》
CSCD
北大核心
1998年第6期570-572,共3页
Journal of Central South University of Technology(Natural Science)
基金
国家军工配套项目
关键词
铝镁合金
应力腐蚀
晶界偏析
氢脆
铸造
Al Mg alloy
stress corrosion
grain boundary segregation
hydrogen embrittlement
