Microstructures, tensile properties and corrosion behavior of die-cast Mg–4Al-based alloys containing La and/or Ce

• Published in: Materials science & engineering. A, Structural materials : properties, microstructure and processing Vol. 489; no. 1; pp. 113 - 119
• Main Authors: Zhang, Jinghuai, Zhang, Deping, Tian, Zheng, Wang, Jun, Liu, Ke, Lu, Huayi, Tang, Dingxiang, Meng, Jian
• Format: Journal Article
• Language: English
• Published: Amsterdam Elsevier B.V 20.08.2008; Elsevier
• Subjects: Applied sciences; Corrosion; Corrosion mechanisms; Corrosion prevention; Elasticity. Plasticity; Exact sciences and technology; Mechanical properties and methods of testing. Rheology. Fracture mechanics. Tribology; Metals. Metallurgy; Mg–Al–RE alloy; Microstructure; Tensile properties; Mg–Al–RE alloy; Corrosion; Microstructure; Tensile properties; Corrosion resistance; Magnesium base alloys; Mg-Al-RE alloy; Phase composition; Fine grain structure; Tensile property; Alloying element; Corrosion product; Grain boundary
• ISSN: 0921-5093; 1873-4936
• DOI: 10.1016/j.msea.2007.12.024

In order to study the properties of Mg–Al–RE (AE) series alloys, the Mg–4Al–4RE–0.4Mn (RE = La, Ce/La mischmetal or Ce) alloys were developed. Their microstructures, tensile properties and corrosion behavior have been investigated. The results show that the phase compositions of Mg–4Al–4La–0.4Mn alloy consist of α-Mg and Al 11La 3 phases. While two binary Al–RE (RE = Ce/La) phases, Al 11RE 3 and Al 2RE, are formed in Mg–4Al–4Ce/La–0.4Mn alloy, and Al 11Ce 3 and Al 2Ce are formed in Mg–4Al–4Ce–0.4Mn alloy. The optimal tensile properties and corrosion resistance are obtained in Mg–4Al–4Ce/La–0.4Mn alloy, the excellent tensile properties are mainly attributed to fine grains and grain boundaries containing fine secondary phases, and the good corrosion resistance is partly related to the presence of compact corrosion product film containing Al and Ce/La.