Magnesium, as a lightweight construction material, has rapidly grown its applications in the automotive industry. To maximize the weight reduction of vehicles by lightweight magnesium alloys in the coming years, the use of newly developed high-temperature magnesium alloys is expected to increase significantly, particularly in the powertrain applications where the creep resistance is always required. Since the early 1990s, several new creep-resistant magnesium alloys have developed by using alloying additions of Ca, Sr, Re, Zr, and Si. The advantages of these newly developed alloys in terms of creep properties are evident compared with the conventional creep-resistant magnesium alloys. Currently, theoretical base of creep behavior of high-temperature magnesium alloys is limited. The further study should begin with the basic characterization of recently developed die casting creep-resistance magnesium alloys. In particular, an in-depth investigation on the role of the second or intermetallic phases in creep deformation of magnesium alloys is required. To facilitate further development, creep maps or deformation mechanism diagrams for magnesium alloys must be established, which provide scientific guidelines for understanding creep deformation and developing creep-resistant materials. The limited knowledge of die castability hampers the success in commercialization of the newly developed alloys. The die castability study of these alloys must be conducted by die casting and examining enough number of powertrain magnesium prototypes in details. Despite the market dominance of die casting processes for automotive magnesium applications, a number of powertrain components, such as engine blocks and bedplates, are produced by the processes, such as sand, permanent mold, and squeeze casting rather than die casting. Development of cost-effective creep-resistant magnesium alloys for these non-die casting processes is essential for expanding magnesium into large mass and high volumes of engine applications where the benefits of weight reduction would be maximized. Fundamental aspects of the creep deformation theory and mechanisms are described. The metallurgical principles for designing the creep-resistant alloys are highlighted. The creep behavior of magnesium and its conventional alloys is discussed based on some microstructure analyses. The mechanical properties, microstructure, and manufacturability of the newly developed creep-resistant magnesium alloys are also overviewed.
Potential magnesium alloys for high temperature die cast automotive applications: a review
Mögliche Magnesiumdruckgusslegierungen für Hochtemperaturanwendungen in der Automobiltechnik: Ein Überblick
Materials and Manufacturing Processes ; 18 , 5 ; 687-717
2003
31 Seiten, 20 Bilder, 5 Tabellen, 37 Quellen
Article (Journal)
English
Die Cast Magnesium Alloys for High Temperature Applications
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