The structure of aluminum boride is similar to that of intermetallic compounds

The structure of aluminum boride is similar to that of intermetallic compounds, and its structure mainly depends on the crystal structure of aluminum metal and boron rather than their valence relationship. Aluminum borides are AlB2, AlB4, and AlB12. The diboride AlB2 can be formed by reacting two elemental substances above 600°C. It is a layered structure in which Al atoms directly overlap (A, A mode), and B atoms are filled in the triangular column formed by the direct overlap of Al atoms; that is, the boron layer is between the two aluminum layers. The boron layer is similar to the graphite structure. The boron atoms are connected into a hexagonal network. The distance between each B atom and the other three B atoms is 0.173nm. Six Al atoms are connected to B, and they occupy the vertices of the triangular column. Superior. AlB2 can be dissolved in dilute hydrochloric acid to produce a reducing solution containing HB(OH)+3. AlB2 is insoluble in dilute sulfuric acid but soluble in nitric acid. AlB2 decomposes to AlB12 above 920°C. Boride particles, added as a constituent phase of Al-B master alloys, are used as a potent aluminum grain refiner. The boron present in these master alloys is diboride (AlB2) and dodecaboride (AlB12) particles. Both phases have low density (although not lower than liquid aluminum), high hardness, and thermal stability. AlB2 has a hexagonal hp3 crystal structure, whereas AlB 12 has a complex tetragonal crystal structure. When added as reinforcements to an aluminum matrix, these boride particles are beneficial in applications such as gears, bearings, and other parts that involve constant surface contact, as the composite is also resistant to wear. Recently, it was discovered that composite specimens containing AlB2 particles possessed higher hardness than specimens containing solely AlB particles. Nonetheless, at the microscale, it was found that the specimens reinforced with AlB2 particles had smaller Vickers microhardness than those with AlB. These two conflicting findings motivated us to seek an explanation of the underlying phenomenon that caused this discrepancy. To this purpose, Rockwell indentation, Vickers microhardness, scanning electron microscopy (SEM), and nanoindentation analysis were performed on representative samples of both composites. Studies on mechanical properties in MMCs through nanoindentation have been the primary objective of prior research. This existing information provides a solid theoretical background for the experimental approach at this moment reported. If you are looking for high quality, high purity and cost-effective aluminum boride, or if you require the latest price of aluminum boride, please feel free to email contact mis-asia.