Influence of Heat Treatment on Microstructure and Corrosion Resistance of Mg-10Gd-2.5Nd-0.5Zr Alloy

doi:10.11902/1005.4537.2015.040

Journal of Chinese Society for Corrosion and protection

2016, Vol. 36

Issue (2): 143-149 DOI: 10.11902/1005.4537.2015.040

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Influence of Heat Treatment on Microstructure and Corrosion Resistance of Mg-10Gd-2.5Nd-0.5Zr Alloy

Xu MA^1,²,Quan'an LI^1,^2,³(

),Xiaotian JING¹

1. College of Materials Science and Technology, Xi'an University of Technology, Xi'an 710048, China
2. College of Materials Science and Technology, Henan University of Science and Technology, Luoyang 471023, China
3. Collaborative Innovation Center of Nonferrous Metals, Henan University of Science and Technology, Luoyang 471023, China

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Abstract

The microstructure of Mg-10Gd-2.5Nd-0.5Zr (mass fraction, %) alloy after solid solution and aging treatment were characterized by means of OM, XRD, TEM and SEM. The average corrosion rate in 3.5% (mass fraction) NaCl solution was measured for 0~96 h. The results show that the microstructure of the as-cast alloy is composed of α-Mg matrix and coarse dentritic crystal β phase. After heat treatment, the β phase has experienced a course of dissolution and then precipitation, while the discontinued net-like β-phase transformed into cuboid-shaped particles due to the solution and aging treatment. The heat treatments are beneficial to the corrosion resistant of the alloy in 3.5%NaCl solution, while its corrosion rate was 0.74 mgcm^-2d^-1 for the as-cast, 0.41 mgcm^-2d^-1 for the solid solution treated and 0.35 mgcm^-2d^-1 for the aging treated ones respectively. The corrosion products of the alloy is mainly composed of Mg(OH)₂.

Key words: heat treatment Mg-10Gd-2.5Nd-0.5Zr alloy microstructure corrosion resistance

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Cite this article:

Xu MA,Quan'an LI,Xiaotian JING. Influence of Heat Treatment on Microstructure and Corrosion Resistance of Mg-10Gd-2.5Nd-0.5Zr Alloy. Journal of Chinese Society for Corrosion and protection, 2016, 36(2): 143-149.

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https://www.jcscp.org/EN/10.11902/1005.4537.2015.040 OR https://www.jcscp.org/EN/Y2016/V36/I2/143

Fig.1 Microstructures of Mg-10Gd-2.5Nd-0.5Zr alloy before and after heat treatment: (a) as-cast, (b) solid solution state, (c) aging state

Fig.2 SEM images of Mg-10Gd-2.5Nd-0.5Zr alloy before and after heat treatment: (a) as-cast, (b) solid solution state, (c) aging state

Fig.3 TEM images of Mg-10Gd-2.5Nd-0.5Zr alloy before and after heat treatment: (a, a') as-cast, (b, b') solid solution state, (c, c') aging state

Fig.4 Corrosion rate vs time curves of as-cast, solid solution and aging treated Mg-10Gd-2.5Nd-0.5Zr alloy

Fig.5 Macroscopical morphologies of Mg-10Gd-2.5Nd-0.5Zr alloy after corrosion in 3.5%NaCl solution for 48 h: (a) aging state, (b) solid solution state, (c) as-cast

Fig.6 Surface morphologies of Mg-10Gd-2.5Nd-0.5Zr alloy after corrosion for 48 h: (a) aging state, (b) solid solution state, (c) as-cast

Fig.7 XRD patterns of the surface corrosion products of Mg-10Gd-2.5Nd-0.5Zr alloy

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