Compression fracture behavior and mechanical properties of ultra high pressure solidified titanium-aluminium intermetallics
(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)
Abstract: The compression fracture behavior and mechanical properties of Ti80Al alloy and Ti48Al alloy solidified under 5.5GPa pressure condition were studied. The results show that the fracture of Ti80Al alloy solidified under high pressure has the characters of cleavage fracture and intergranular crack differing with cleavage fracture of that under vacuum. The fracture of Ti48Al alloy solidified under high pressure is cleavage fracture like that under vacuum. The compression strength of vacuum condition solidified Ti80Al alloy is 316MPa. However when the solidification pressure is increased to 5.5GPa, the compression strength of Ti80Al is increased to 440MPa. In the mean time, during ultra high pressure solidification the hardness of Ti80Al alloy and Ti48Al alloy increase from 8.755GPa and 5.408GPa under vacuum to 9.572GPa and 6.227GPa respectively, and elastic modulus also increase from 279.3GPa and 232.3GPa under vacuum to 295.8GPa to 252.9GPa respectively.
Key words: TiAl3 intermetallics； ultra high pressure； compression fracture behavior； compression strength； hardness