Effect of Hot-Pressing Temperature on Microstructure and Properties of Diffusion-Bonded Ti60 Titanium Alloy AITranslate

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Chinese Library Classification Number:TG146.23[一般工业技术]

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Using Ti60 high-temperature titanium alloy as the research subject,the influence of hot-pressing temperature on the interfacial microstructure and mechanical properties of the diffusion-bonded joints was studied through optical microscope(OM),scanning electron microscope(SEM),electron backscatter diffractometer(EBSD),Image J software analysis,and tensile testing.The results show that diffusion-bonded Ti60 high-temperature titanium alloy achieves good metallurgical bonding at all tested hot-pressing temperatures,and dynamic recrystallization occurs at the interface during hot-pressing,generating fineα-phase grains.With the increase of hot-pressing temperature,the area fraction of large-sizeα-phase at the interface increases.Due to crystallographic mismatch at the diffusion-bonded interface,which impedes coordinated deformation,stress concentration occurs at the interface during room-temperature tensile deformation,leading to brittle fracture and low plasticity in the alloy.During high-temperature tensile deformation,the crystallographic mismatch at the high-temperature diffusion-bonded interface is reduced,resulting in a transition in the interfacial fracture mode from brittle fracture to ductile fracture,with the interfacial plasticity close to that of the base material.