Influence of chemical liquids on the fatigue crack growth of the AZ31 magnesium alloy |
| |
Authors: | Zhang-zhong Wang Xian-cong He Yun-qiang Bai Zhi-xin Ba Yu-ming Dai Heng-zhi Zhou |
| |
Institution: | 1.Department of Materials Science and Engineering,Nanjing Institute of Technology,Nanjing,China |
| |
Abstract: | The fatigue crack growth behavior of an AZ31 magnesium alloy was investigated by comparing the effect of zirconate and phosphate
chemical liquids. The morphology, components, and phase compositions of the chemical depositions at the fatigue crack tip
were analyzed by employing scanning electron microscopy (SEM), energy dispersive spectroscopy (EDS), and X-ray diffraction
(XRD), respectively. For samples with and without the chemical liquids, their stress-intensity factor values at the fatigue
crack tip were compared by using a stress-strain gauge. The results demonstrated that a zirconate film (Zr
x
O
y
·Zn
x
O
y
) and a phosphate film (Zn3(PO4)2·4H2O and MgZnP2O7) could be formed on the fatigue crack-surface at the fatigue crack tip. The stress distribution was changed because of the
chemical depositions and the causticity of the chemical liquids. This could decrease the stress-intensity factor value and
thus effectively cause fatigue crack closure, which reduces the fatigue crack growth rate. Moreover, it was found that the
fatigue crack closure effect of zirconates was more positive than that of phosphates. |
| |
Keywords: | |
本文献已被 万方数据 SpringerLink 等数据库收录! |
| 点击此处可从《矿物冶金与材料学报》浏览原始摘要信息 |
| 点击此处可从《矿物冶金与材料学报》下载免费的PDF全文 |
|