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In-situ investigation of phase transformations in ultra-fine grained Ti15Mo alloy

Bartha, Kristína and Stráský, Josef and Barriobero Vila, Pere and Šmilauerová, Jana and Doležal, Petr and Veselý, Jozef and Semenova, Irina and Polyakova, Veronika and Janeček, Miloš (2021) In-situ investigation of phase transformations in ultra-fine grained Ti15Mo alloy. Journal of Alloys and Compounds, 867. Elsevier. doi: 10.1016/j.jallcom.2021.159027. ISSN 0925-8388.

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Official URL: https://doi.org/10.1016/j.jallcom.2021.159027

Abstract

A metastable β solution treated Ti15Mo alloy was deformed by high pressure torsion (HPT) resulting in a severely deformed microstructure with high density of lattice defects. In order to gain insight into the kinetics of phase transformations, both non-deformed and HPT-deformed materials were studied in-situ during linear heating; phase evolution was investigated using high energy synchrotron X-ray diffraction (HEXRD) complemented by the measurement of electrical resistance. It was shown that in the non-deformed material the dissolution of the ω phase is followed by precipitation of the α phase during linear heating. In contrast, in the HPT-deformed material the nucleation of the α phase is shifted to lower temperatures, resulting in the coexistence of all three β, ω, and α phases at ~550 °C. Moreover, in HPT-deformed samples, the growth of α particles is accelerated due to high density of dislocations and grain boundaries. Post-mortem observations of selected samples revealed that the microstructure of the HPT-deformed material after heating up to 650 °C remains ultra-fine grained with equiaxed grains of α phase.

Item URL in elib:https://elib.dlr.de/141341/
Document Type:Article
Additional Information:Referierte Publikation - Ja
Title:In-situ investigation of phase transformations in ultra-fine grained Ti15Mo alloy
Authors:
AuthorsInstitution or Email of AuthorsAuthor's ORCID iD
Bartha, KristínaUNSPECIFIEDUNSPECIFIED
Stráský, JosefUNSPECIFIEDUNSPECIFIED
Barriobero Vila, PerePere.BarrioberoVila (at) dlr.dehttps://orcid.org/0000-0002-4412-3729
Šmilauerová, JanaUNSPECIFIEDUNSPECIFIED
Doležal, PetrUNSPECIFIEDUNSPECIFIED
Veselý, JozefUNSPECIFIEDUNSPECIFIED
Semenova, IrinaUNSPECIFIEDUNSPECIFIED
Polyakova, VeronikaUNSPECIFIEDUNSPECIFIED
Janeček, MilošUNSPECIFIEDUNSPECIFIED
Date:2021
Journal or Publication Title:Journal of Alloys and Compounds
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In SCOPUS:Yes
In ISI Web of Science:Yes
Volume:867
DOI :10.1016/j.jallcom.2021.159027
Publisher:Elsevier
Series Name:159027
ISSN:0925-8388
Status:Published
Keywords:Metals and alloys, Nanostructured materials, Phase transitions, Synchrotron radiation
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Space
HGF - Program Themes:Research under Space Conditions
DLR - Research area:Raumfahrt
DLR - Program:R FR - Research under Space Conditions
DLR - Research theme (Project):R - Material Design and New Materials
Location: Köln-Porz
Institutes and Institutions:Institute of Materials Research
Institute of Materials Research > Metallic Structures and Hybrid Material Systems
Deposited By: Barriobero Vila, Pere
Deposited On:31 Mar 2021 07:43
Last Modified:31 Mar 2021 07:43

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