Microstructures and tensile properties of hot-extruded composite Bi2O3-coated ABOw/Al composite
(1.黑龙江省哈尔滨市哈尔滨工业大学材料科学与工程学院
2.School of Materials Science and Engineering, Harbin Institute of Technology, Harbin 150001, China)
2.School of Materials Science and Engineering, Harbin Institute of Technology, Harbin 150001, China)
Abstract: A pure aluminum matrix composite reinforced by Bi2O3-coated aluminum borate whisker was fabricated by a squeeze casting method. The mass ratio of Bi2O3 to whisker is 1？30. The interfacial reaction between Bi2O3 coating and aluminum takes place during casting process. Deformation behavior and formability of ABOw reinforced aluminum (ABOw/Al) composites with and without Bi2O3 coating were investigated by the extrusion deformation at 400 ℃. The results show that the steady-state extrusion load and the probability of whisker fracture of extruded ABOw/Al composite with Bi2O3 coating are lower than those of extruded ABOw/Al composite, and its surface quality is better than that of extruded ABOw/Al composite. Evaluation of the tensile properties shows that the extruded ABOw/Al composite with Bi2O3 coating have the ultimate tensile strength and yield strengths with 0.2% superior to those of ABOw/Al composite.
Key words: aluminum matrix composite; Al18B4O33 whisker; extrusion deformation; liquid bismuth