Effect of heat treatment process on the structure and properties of deformed TiAl sheets
TiAl based intermetallic compounds have attracted widespread attention of domestic to inter-national researches due to their lightweight,high specific strength,and excellent high-temperature per-formance,and have been applied in key fields such as aerospace and aviation,etc.However,due to their inherent characteristics,their practical application has been greatly limited.By exploring the heat treat-ment process in different phase zones and selecting appropriate heat treatment parameters,combined with the analysis of room temperature mechanical properties and high-temperature mechanical proper-ties of TiAl compounds,it is found that the tensile strength and yield strength of specimens gradually in-crease as the heat treatment temperature increases.The optimal elongation is obtained by heat treatment in the(α+β)phase zone.Further observation and analysis of the microstructure and fracture morpho-logy of samples tested at room and high temperatures were conducted to determine the crack propaga-tion mode and fracture mechanism.Finally,the mechanical properties were optimized after heat-treated at the solution temperature of 1 370 ℃.
TiAl alloyheat treatment processstructuremechanical propertiescrackingfracture mor-phology
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