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Phase/grain boundary assisted-3d static globularization mechanism of TC17 alloy based on the microstructure reconstruction and in-situ TEM observation

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Journal of Materials Science & Technology 2023年第26期157卷 246-261页

作者： Haoyu Pang Yingang Liu Jiao Luo Cong Li Hong Li School of Materials Science and Engineering Northwestern Polytechnical UniversityXi’an 710072China

Lamellar globularization in the dual-phase titanium alloy is the key to improving plasticity and ***,the mechanism has not been fully elucidated so *** this work,the role of phase/grain bound-ary in the static globularization of TC17 alloy was systematically studied by setting differentαphase con-tent before annealing through low-and high-temperature *** compression causes the parallel distribution and fragmentation of 3dαplates and few globularαparticles are formed at a strain rate of 1 s^(-1).Post-deformation annealing promotes the static globularization ofαphase while it is affected by initialαphase *** 730°C deformation,the development ofα/αinterface by absorbing dislocations promotes the formation of globularαgrains based on the nucleation of sepa-ratedαparticles and pre-recoveryαsubgrain during subsequent ***α/α/βandα/β/βtriple junctions formed due to highαcontent with about 36%volume fraction are favorable for the further nucleation and growth of globularαgrains by reducing interface energy,forming a 3d irregularα*** nucleation and growth of theβphase dominate the microstructure evolution during subsequent an-nealing,resulting in the local dissolution of the plate and formation ofα*** 850°C deformation,theαphase tends to nucleate at theβ/β/βtriple junctions and grow into a lamellar shape along the high energyβ/βgrain boundary due to lowαcontent with about 7%volume ***αnucleation that maintains the Burgers orientation relationship(BOR)with the surroundingβphase grows along the habit plane and thickens slowly,resulting in the formation of a precipitatedαplate with a flat surface and the suppression of static *** comprehensive investigation of lamellar globularization provides guidance for optimizing the 3d microstructure and properties of dual-phase titanium alloy.

关键词： Titanium alloy Static globularization 3d microstructure Phase/grain boundary Nucleation and growth In-situ TEM heating

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