Abstract
Magnesium-based metal matrix nanocomposites (MMNCs) are an important topic in the development of lightweight structural materials, because their optimized properties are of great interest to the automotive and aerospace industries. Moreover, components with functional properties will also be manufactured from Mg-MMNCs in the future. With a large surface to volume ratio, nanoparticles in the magnesium matrix have an immense effect on mechanical properties, even at low concentrations. The mechanical properties of these materials can be tailored using ceramic nanoparticles, which have been available at a very low cost for a number of years. However, the particle concentration, chemical composition, particle size, and process parameters must be attuned to the respective alloy, in order to influence the resulting properties. When using very small particles, a major problem is to homogeneously distribute the particles in the melt. Due to their large surface area, strong van der Waals forces act to hold the particles together in clusters. At the same time, wettability of the particles with a magnesium melt is very poor. Ultrasonic stirring processes have proven their effectiveness in the de-agglomeration and dispersion of nanoparticles. This review presents ultrasound-assisted processes for the production of these materials and describes some properties of the resulting Mg-MMNCs.
Highlights
The use of magnesium alloys has steadily increased over the last twenty-five years in the automotive industry and 3C
Magnesium alloys for room temperature applications, such as AZ91, AM50, and AM60, give excellent room temperature strength and ductility, they are castable, have good machinability, and their corrosion resistance is fairly good. When it comes to higher temperatures, more advanced alloys containing rare earth elements (AE42, AE44) [1], silicon (AS21, AS41) [2], strontium (AJ62) [3], barium (DieMag422) [4], and other more costly elements are in use
Cao et al published research on an AZ91 magnesium alloy reinforced by nano-AlN and processed
Summary
The use of magnesium alloys has steadily increased over the last twenty-five years in the automotive industry and 3C (computer, communications, and consumer electronics). Magnesium alloys for room temperature applications, such as AZ91, AM50, and AM60, give excellent room temperature strength and ductility, they are castable, have good machinability, and their corrosion resistance is fairly good When it comes to higher temperatures, more advanced alloys containing rare earth elements (AE42, AE44) [1], silicon (AS21, AS41) [2], strontium (AJ62) [3], barium (DieMag422) [4], and other more costly elements are in use. To improve the properties of all the alloys mentioned, yet keep their density low, ceramic nanoparticles can be added to the melt, during or before casting, in order to influence the microstructure. Ultrasonic treatment of a magnesium alloy’s melt activates several different effects that will be briefly described at the beginning
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