Abstract
The strength of Mg–Li alloy is greatly improved by the composite strengthening of intermetallic compound YAl2 particles, but the low corrosion resistance of Mg–Li alloy is still the main factor that restricts the application of the alloy and its composites. In this paper, the effect of YAl2 particles on the corrosion behavior of Mg–Li alloy was systematically investigated. The results showed that the corrosion resistance of YAl2p/LA143 composite could be significantly improved, accounting for the formation of a transitional interface layer by adding YAl2 particles. The diffusion of yttrium and aluminum atoms from YAl2 particulates improved the stability of the surface film and enhanced the adhesion between the corrosion products and the substrate, which hindered further expansion of pitting.
Highlights
Mg–Li-based alloys are currently the lightest among the metallic structural materials, characterized with many excellent properties such as high specific strength, mechanical casting properties, good damping capacity, good thermal conductivity and electromagnetic shielding performance [1,2]
It can be seen that the weight loss of the LA143 alloy is nearly two times larger than that of the composite
The corrosion rate of rate of LA143 alloy is higher before 24 h and declines gradually
Summary
Mg–Li-based alloys are currently the lightest among the metallic structural materials, characterized with many excellent properties such as high specific strength, mechanical casting properties, good damping capacity, good thermal conductivity and electromagnetic shielding performance [1,2]. Mg–Li alloys have the inherent problems of low absolute strength, high chemical activity and poor corrosion resistance, which could decrease their mechanical stability and limit their extensive use [7,8,9,10]. It is known that compound reinforcement is a possible way to increase strength and stiffness of Mg–Li-based alloys and prevent mechanical properties degradation. S.J.Wang and G.Q.Wu et al [11] developed an Mg–Li matrix composite reinforced with intermetallic compounds (5 wt.% YAl2 particulates) by stirring casting technique. The YAl2 particulates uniformly dispersed inside the matrix alloy, and the mechanical properties of the composite were significantly improved. In spite of the excellent mechanical properties, poor corrosion resistance has become a critical issue that restricts the applications of Mg–Li composite material. The weak corrosion resistance of Mg–Li-based alloys is mainly caused by the presence of Li, a highly electrochemical and chemically active element
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