In order to give full play to the excellent properties of Ti6242S titanium alloy,the high temperature tensile properties and microstructure evolution of Ti6242S alloy with equiaxed and duplex microstructures Ⅰ and Ⅱ three different structures were studied by optical microscope,scanning electron microscope and high temperature tensile test.The results show that in the process of high temperature stretching,the α phase of three different structures have obvious elongation,and the α phase elongation of equiaxed is higher.Equiaxed α phase is beneficial for coordinating plastic deformation,so the plasticity and resistance to uniform plastic deformation of equiaxed microstructure are the best.The presence of both lamellar α phase and acicular α phase will result in interface strengthening,leading to an increase in material strength.And the increase in material strength due to acicular α phase is greater than that due to lamellar α phase,so the strength of duplex microstructure Ⅱ is the best.In the duplex microstructure Ⅱ,the intertwined secondary α phase arranged in a basket-like network will promote the formation of tough cavities and reduce the number of tear ridges.Hence,the plasticity and fracture toughness of duplex microstructure Ⅱ are superior to those of duplex microstructure Ⅰ.
Ti6242S titanium alloymicrostructurehigh temperature tensile propertyfracture morphology
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