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Microstructure and texture evolution of commercial pure titanium deformed at elevated temperatures
KTH, School of Industrial Engineering and Management (ITM), Materials Science and Engineering, Mechanical Metallurgy. (Mechanical Metallurgy)
KTH, School of Industrial Engineering and Management (ITM), Materials Science and Engineering, Mechanical Metallurgy. (Mechanical Metallurgy)
KTH, School of Industrial Engineering and Management (ITM), Materials Science and Engineering, Mechanical Metallurgy. (Mechanical Metallurgy)ORCID iD: 0000-0002-2230-5097
2009 (English)In: Materials Science & Engineering: A, ISSN 0921-5093, E-ISSN 1873-4936, Vol. 513, p. 83-90Article in journal (Refereed) Published
Abstract [en]

Microstructure and texture evolution of commercial pure titanium were investigated by electron backscattered diffraction (EBSD) after compression tests at elevated temperatures. The basal planes of both the fine and coarse grains in the deformed samples tend to rotate from the initial orientations, perpendicular to the compression axis, to an inclination of 45°. The Schmid factor is used to analyse how the individual slip systems activate and how their activities evolve under various deformation conditions. After deformation, the distribution frequency of the misorientation angles shows that the low angle grain boundaries increased dramatically while the high angle grain boundaries decreased. In particular, after deformation at 723 K and 0.1/s, a peak around 50–60° in the misorientation frequency-distribution is found, which is due to {10-11} twinning. The analysis of the deformed microstructure indicates that dynamic recovery is the dominant deformation mechanism for commercial pure titanium when subjected to the investigated deformation conditions.

Place, publisher, year, edition, pages
2009. Vol. 513, p. 83-90
Keywords [en]
Commercial pure titanium; Texture; Schmid factor; Misorientation; Hot compression; Slip system
National Category
Materials Engineering
Identifiers
URN: urn:nbn:se:kth:diva-10416DOI: 10.1016/j.msea.2009.01.065ISI: 000266577400012Scopus ID: 2-s2.0-65349171501OAI: oai:DiVA.org:kth-10416DiVA, id: diva2:216820
Note
QC 20100819Available from: 2009-05-18 Created: 2009-05-12 Last updated: 2022-09-13Bibliographically approved
In thesis
1. Deformation Behaviour, Microstructure and Texture Evolution of CP Ti Deformed at Elevated Temperatures
Open this publication in new window or tab >>Deformation Behaviour, Microstructure and Texture Evolution of CP Ti Deformed at Elevated Temperatures
2009 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

In the present work, deformation behavior, texture and microstructure evolution of commercially pure titanium (CP Ti) are investigated by electron backscattered diffraction (EBSD) after compression tests at elevated temperatures. By analysing work hardening rate vs. flow stress, the deformation behaviour can be divided into three groups, viz. three-stage work hardening, two-stage work hardening and flow softening. A new deformation condition map is presented, dividing the deformation behavior of CP Ti into three distinct zones which can be separated by two distinct values of the Zener-Hollomon parameter. The deformed microstructures reveal that dynamic recovery is the dominant deformation mechanism for CP Ti during hot working. It is the first time that the Schmid factor and pole figures are used to analyse how the individual slip systems activate and how their activities evolve under various deformation conditions. Two constitutive equations are proposed in this work, one is for single peak dynamic recrystallization (DRX), the other is specially for CP Ti deformed during hot working. After the hot compression tests, some stress-strain curves show a single peak, leading to the motivation of setting up a DRX model. However, the examinations of EBSD maps and metallography evidently show that the deformation mechanism is dynamic recovery rather than DRX. Then, the second model is set up. The influence of the deformation conditions on grain size, texture and deformation twinning is systematically investigated. The results show that {10-12} twinning only occurs at the early stage of deformation. As the strain increases, the {10-12} twinning is suppressed while {10- 11} twinning appears. Three peaks are found in the misorientation frequency-distribution corresponding to basal fiber texture, {10-11} and {10-12} twinning, respectively. A logZ-value of 13 is found to be critical for both the onset of {10-11} compressive twinning and the break point for the subgrain size. The presence of {10-11} twinning is the key factor for effectively reducing the deformed grain size. The percentage of low angle grain boundaries decreases with increasing Z-parameter, falling into a region separated by two parallel lines with a common slope and 10% displacement. After deformation, three texture components can be found, one close to the compression direction, CD, one 10~30° to CD and another 45° to CD.

Place, publisher, year, edition, pages
Stockholm: KTH, 2009. p. iv, ii, 57
Keywords
Commercially pure titanium; Zener–Hollomon parameter; Dynamic recovery; Dynamic recrystallization; Recrystallized volume fraction; Grain size; Flow stress; Constitutive equation; Texture; High angle grain boundary; Low angle grain boundary; Deformation twinning; Schmid factor; Misorientation; Hot compression; Slip system; Subgrain; EBSD
National Category
Other Materials Engineering
Identifiers
urn:nbn:se:kth:diva-10404 (URN)978-91-7415-305-7 (ISBN)
Public defence
2009-06-04, B2, KTH, Brinellvägen 23, Stockholm, 10:00 (English)
Opponent
Supervisors
Note
QC 20100819Available from: 2009-05-18 Created: 2009-05-11 Last updated: 2022-09-13Bibliographically approved

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