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Adaptive Volume Control in Titanium Alloy for High Temperature Performance
Xi An Jiao Tong Univ, State Key Lab Mech Behav Mat, Xian 710049, Shaanxi, Peoples R China..
KTH, School of Industrial Engineering and Management (ITM), Materials Science and Engineering, Applied Material Physics. Xi An Jiao Tong Univ, Frontier Inst Sci & Technol, Ctr Microstruct Sci, Xian 710049, Shaanxi, Peoples R China.;Royal Inst Technol, Dept Mat Sci & Engn, Appl Mat Phys, SE-10044 Stockholm, Sweden..
Xi An Jiao Tong Univ, Frontier Inst Sci & Technol, Ctr Microstruct Sci, Xian 710049, Shaanxi, Peoples R China..
Xi An Jiao Tong Univ, Frontier Inst Sci & Technol, Ctr Microstruct Sci, Xian 710049, Shaanxi, Peoples R China..
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2019 (English)In: Materials, ISSN 1996-1944, E-ISSN 1996-1944, Vol. 12, no 23, article id 3950Article in journal (Refereed) Published
Abstract [en]

With the increase of time, the shrinkage of materials at fixed temperature could enhance the failure of fasteners. We report a potential way to alter the volume/length of alloy automatically through isothermal aging due to pseudospinodal decomposition mechanism. The volume of Ti-10V-2Fe-3Al alloy first shrunk and then expanded during isothermal aging at 550 degrees C. It can fit tightly and make up for volume loss. Transmission electron microscopy observation exhibits no obvious coarsening of intragranular alpha phase with the increasing time. However, composition evolution with time shows a gradual change through energy dispersive spectrometer analysis. The result shows that beta stabilizers, V and Fe, are prone to diffuse to the beta matrix, while alpha stabilizers, Al, prefer to segregate to the alpha phase. First principle calculations suggest that the structure transition for beta to alpha cause the first decrease of volume, and the diffusion of V, Fe and Al is the origin of the later abnormal increase of volume.

Place, publisher, year, edition, pages
MDPI , 2019. Vol. 12, no 23, article id 3950
Keywords [en]
Ti-1023 alloy, adaptive volume, isothermal, high temperature performance
National Category
Materials Chemistry
Identifiers
URN: urn:nbn:se:kth:diva-267757DOI: 10.3390/ma12233950ISI: 000510178700146PubMedID: 31795224Scopus ID: 2-s2.0-85075877613OAI: oai:DiVA.org:kth-267757DiVA, id: diva2:1393829
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QC 20200217

Available from: 2020-02-17 Created: 2020-02-17 Last updated: 2020-02-27Bibliographically approved

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