Effects of Orientations, Roughnesses, and Cavities on Stress-Corrosion Coupled Damage in Magnesium

Crystals

Shijie Bai¹  Xinke He¹  Jianbin Chen¹  Chao Xie¹  Jianhui Ye¹ 

[1] The Faculty of Mechanical Engineering and Mechanics, Ningbo University, Ningbo 315211, China;

关键词: magnesium;    cavity;    stress-corrosion coupled damage;    phase field;    finite element;   

DOI  :  10.3390/cryst12050635

来源: DOAJ

【 摘 要 】

Orientations, roughnesses, and cavities of crystals are typical factors influencing the servicing reliability of metals in corrosive environments. A phase-field scheme for modeling stress-corrosion coupled damage (SCCD) is developed. The effects of the crystal factors on SCCD are numerically simulated using the incremental-iterative scheme of the user-defined finite elements. The impacts of orientations, roughnesses, and cavities on the corrosion rate of magnesium (Mg) in corrosive environments are discussed quantitatively. It is found that crystal textures and surface roughnesses can significantly influence the diffusion-controlled corrosion rate. Strong basal texture and a smooth surface of the crystal can significantly enhance the corrosion resistance of Mg. The cavity, as a typical crystal defect, is capable of inducing the damage path and modulating the corrosion rate. The design of crystal-scale features, such as orientations, roughnesses, and cavities, is promising for the enhancement of the resistance to SCCD.

【 授权许可】

Unknown