Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
1607858 | Journal of Alloys and Compounds | 2016 | 10 Pages |
Abstract
The stress corrosion cracking susceptibility of traditional Al-Mg alloys modified by Zn was studied by using slow strain rate test both in the air and in 3.5Â wt.% NaCl solution acidified with HCl to pH 3. Traditional Al-Mg alloys showed serious susceptibility to intergranular stress corrosion cracking, while Zn modified alloy showed relatively no susceptibility. It suggested that stress corrosion cracking resistance was significantly improved by Zn additions in acidified NaCl solution coupled with a transition from brittle failure to completely ductile failure. Both the distributions of grain boundary precipitations and grain boundary misorientation were modified by Zn addition to the Al-Mg alloys. Traditional Al-Mg alloys showed a continuous distribution of precipitations along the grain boundary, while Zn modified alloy showed a homogeneous precipitation in the matrix and discontinuous precipitation along the grain boundary. The low-angle grain boundaries had good resistance to intergranular stress corrosion cracking even though continuously precipitated along the grain boundary.
Related Topics
Physical Sciences and Engineering
Materials Science
Metals and Alloys
Authors
Chunyan Meng, Di Zhang, Linzhong Zhuang, Jishan Zhang,