Investigation Of Three-dimensional Net Structure Reinforced Magnesium Alloy Composites

High-strength magnesium alloy and magnesium alloy composites has important application prospect in cars and other products. Wires net, stainless steel fiber reinforced AZ91 magnesium alloy composites and AZ91/Porous titanium duplex 3d connected respectively produced by seepage casting method in this paper, and the composite stainless steel fiber/AZ91 magnesium alloy composite material for extrusion processing. The microstructures and interface were examined by optical microscopy (OM) metallurgical microscope and scanning electron microscopy (SEM). The mechanical properties of the alloys were tested by universal electronic material testing machine. The fracture surfaces were analysized by using SEM. The important results are summaried as following:(1)The fracture strength of composites respectively were 333MPa,338MPa,383MPa when the AZ91 composites with volume fraction of 5%,7%,9% stainless steel web reinforcement. The fracture strengths increase 18%,20% and 36% respectively compared to AZ91 alloy.(2)The cast AZ91 and stainless-steel wire/AZ91 magnesium alloy composites' mechanical properties are both greatly improved after extrusion. The tensile strength and yield strength of stainless-steel wire/AZ91 magnesium alloy composites are 375MPa and 428.6MPa respectively, compared with the extruded AZ91, were increased by 50% and 20%, while the plastic deformation of composite materials have improved significantly.(3)AZ91 completely filled the gap of porous titanium, and the two different phase interfacial well in AZ91/Porous titanium foam interpenetrating phase composite. The compressive strength of composite materials 541MPa, yield strength 400MPa, plastic extension rate was 12.5%.