Spinodal decomposition coupled with a continuous crystal ordering in a titanium alloy
Wang, W. J.1,2; Gong, D. L.1,2; Wang, H. L.3; Ke, Y. B.4; Qi, L.5; Li, S. J.1; Yang, R.1; Hao, Y. L.1
Corresponding AuthorHao, Y. L.(
Source PublicationACTA MATERIALIA
AbstractSpinodal decomposition mechanism is well-known for producing nanoscale modulated microstructure which is either sponge-like or plate-like. Our recent investigations of a Ti-Nb based titanium alloy have found two kinds of decomposition-induced transitions triggered simultaneously, a microstructural tran-sition from the spongy-like to the plate-like and a crystal structure transition from bcc to hcp via the coupled atomic shear and shuffle mechanism along the Burgers pathway. Here focuses on thermal evo-lution kinetics of both transitions and their quantitative relations. Small angle neutron scattering profiles reveal that the aging treatments lead to a gradual change from an oval pattern to a butterfly pattern due to the spongy-to-plate microstructural transition. To characterize the crystal transition and its induced habit plane change, we define an ordering parameter from the shear component of the bcc-hcp tran-sition. The results reveal that both follow the well-known power-law approximation with an activation energy of similar to 209 kJ/mol, which is identical with diffusion energy of Nb in binary Ti-Nb alloy. However, their time exponential factors are different, about 1/5 for the microstructure growth and 1/16 for the crystal ordering and its induced habit plane change. The former is less than the common 1/3 law of the decomposition mechanism and the nucleation and growth mechanism. Aided by these kinetic equations, the microstructural and chemical parameters can be modeled by the crystal ordering. This provides a new strategy to tune the nanoscale microstructure by this novel spinodal decomposition coupled with a continuous crystal ordering. (C) 2022 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.
KeywordSpinodal decomposition Small angle neutron scattering Microstructural transition Crystal ordering Titanium alloy
Funding OrganizationNSF of China ; MOST of China ; CAS
Indexed BySCI
Funding ProjectNSF of China[51771209] ; NSF of China[51631007] ; MOST of China[2016YFC1102600] ; MOST of China[2017YFC1104901] ; CAS[QYZDJ-SSW-JSC031]
WOS Research AreaMaterials Science ; Metallurgy & Metallurgical Engineering
WOS SubjectMaterials Science, Multidisciplinary ; Metallurgy & Metallurgical Engineering
WOS IDWOS:000830505000003
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Document Type期刊论文
Corresponding AuthorHao, Y. L.
Affiliation1.Chinese Acad Sci, Shi Changxu Innovat Ctr Adv Mat, Inst Met Res, Shenyang 110016, Peoples R China
2.Univ Sci & Technol China, Sch Mat Sci & Engn, Shenyang 110016, Peoples R China
3.Dongguan Univ Technol, Sch Mech Engn, Dongguan 523808, Peoples R China
4.Chinese Acad Sci, Inst High Energy Phys, China Spallat Neutron Source, Dongguan 523803, Peoples R China
5.Shandong Univ, Sci Ctr Mat Creat & Energy Convers, Inst Frontier & Interdisciplinary Sci, Qingdao 266237, Peoples R China
Recommended Citation
GB/T 7714
Wang, W. J.,Gong, D. L.,Wang, H. L.,et al. Spinodal decomposition coupled with a continuous crystal ordering in a titanium alloy[J]. ACTA MATERIALIA,2022,233:12.
APA Wang, W. J..,Gong, D. L..,Wang, H. L..,Ke, Y. B..,Qi, L..,...&Hao, Y. L..(2022).Spinodal decomposition coupled with a continuous crystal ordering in a titanium alloy.ACTA MATERIALIA,233,12.
MLA Wang, W. J.,et al."Spinodal decomposition coupled with a continuous crystal ordering in a titanium alloy".ACTA MATERIALIA 233(2022):12.
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