A Comparison of SCC Behaviors for Two States of Fe85Ga15 Alloys in a 3.5 wt % NaCl Solution

Suli Zhao; Junliang He; Xuewei Zhang; Jinxu Li

doi:10.3390/ma13112536

A Comparison of SCC Behaviors for Two States of Fe₈₅Ga₁₅ Alloys in a 3.5 wt % NaCl Solution

Materials (Basel). 2020 Jun 3;13(11):2536. doi: 10.3390/ma13112536.

Authors

Suli Zhao¹, Junliang He¹, Xuewei Zhang¹, Jinxu Li¹

Affiliation

¹ Corrosion and Protection Center, Institute for Advanced Materials and Technology, University of Science and Technology Beijing, Beijing 100083, China.

Abstract

The new magnetostrictive material Fe-Ga alloy has drawn considerable attention due to its excellent performance. The microstructure of the Fe-Ga alloy, which varies with the state of preparation or processing, not only affects the magnetostriction but also the mechanical service stability, i.e., the stress corrosion cracking (SCC) property. In this paper, we report a comparison of the SCC behaviors for two states of Fe₈₅Ga₁₅ alloys by using constant load experiments and the electrochemical method. Results showed that the hot-rolled Fe₈₅Ga₁₅ alloy exhibited better mechanical properties compared to the as-cast Fe₈₅Ga₁₅ alloy. SCC was found in both Fe₈₅Ga₁₅ alloys in a 3.5 wt % NaCl solution, and the as-cast alloy was more sensitive to SCC. The normalized thresholds of SCC for the as-cast and hot-rolled Fe₈₅Ga₁₅ alloys are 0.34 and 0.81, respectively. Furthermore, results also indicated that the SCC mechanism is an anodic dissolution for the Fe₈₅Ga₁₅ alloy.

Keywords: Fe-Ga alloy; SCC; anodic dissolution; normalized threshold stress.

Abstract

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