Microstructure and mechanical properties of magnesium matrix composite reinforced with magnesium borate whisker

Abstract

The microstructure, mechanical properties and fracture behavior of AZ91D magnesium matrix composite reinforced with magnesium borate whisker fabricated by squeeze casting technique were investigated. The results indicate that magnesium borate whisker can improve the mechanical properties of AZ91D alloy significantly. Transmission electron microscope observation shows that a continuous magnesium oxide interfacial layer of about 25 nm thick is formed at the magnesium borate whisker/matrix interface, which is formed from the interfacial reaction between the liquid Mg and oxygen absorbed at the surface of magnesium borate whisker. The magnesium oxide interfacial layer can act as a barrier layer to prevent the further reaction between magnesium borate whisker and the liquid Mg, and may play an important role in the improvement of the mechanical properties of the composite.

Molten-salt assisted synthesis and characterization of Mg2B2O5 and Al18B4O33 whiskers

“…For example, the properties of Al 18 B 4 O 33 whisker-reinforced aluminum and magnesium alloys are similar to those of SiC whiskers, which are widely regarded as the best type of whisker reinforcer for these composites. However, the price of Al 18 B 4 O 33 whiskers is far below that of SiC whiskers (1/10-1/30) [6][7][8]. Meanwhile, Mg 2 B 2 O 5 and Al 18 B 4 O 33 whiskers are stable in oxidizing environments, which means they can find applications in oxidation resistant reinforcement composites, such as in the automotive, high performance defense, and aerospace fields [9].…”

Heat Capacities and Thermodynamic Properties of Hungchaoite and Mcallisterite

“…Magnesium borates and their superior performances are widely used in chemical industries, alkali-free glass fiber, ceramic, and agriculture [1,2]. China is rich in boron resources with solid boron mineral in the east and liquid boron mineral in the brine of salt lakes in the west.…”