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Tracking the αʺ martensite decomposition during continuous heating of a Ti-6Al-6V-2Sn alloy

Barriobero-Vila, Pere and Biancardi Oliveira, Verona and Schwarz, Sabine and Buslaps, Thomas and Requena, Guillermo (2017) Tracking the αʺ martensite decomposition during continuous heating of a Ti-6Al-6V-2Sn alloy. Acta Materialia, 135, pp. 132-143. Elsevier. DOI: 10.1016/j.actamat.2017.06.018 ISSN 1359-6454

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Official URL: http://dx.doi.org/10.1016/j.actamat.2017.06.018

Abstract

The effect of heating rate on the decomposition kinetics of α″ martensite is continuously studied for a β-quenched Ti-6Al-6V-2Sn α + β alloy using fast in situ high energy synchrotron X-ray diffraction. The investigations are complemented with ex situ as well as dynamic metallographic analysis to reveal the mechanisms of phase transformation during critical stages of heating. The initial microstructure consists in a homogeneous distribution of fine acicular αʺ plates subdivided into domains associated with spinodal decomposition of αʺ, formed during β → αʺ transformation upon quenching. Quantitative phase analysis based on the Rietveld method provides the continuous evolution of lattice parameters, revealing the progression of diffusion-driven processes controlling the decomposition of αʺ into stable α and β phases (αʺ → α + β). The onset of this transformation shifts to higher temperatures with increasing heating rate. During the first stage of stabilization, precipitation of fine β particles occurs along the boundaries of twin related αʺ plates, while formation of β and α phases in the interior of α″ plates is identified at higher temperatures. Early formation of α takes place along boundaries of internal {111} α″ nano-twins, propagates up the borders of α″ plates, and can eventually further extend towards internal twins of neighbour martensite plates. Internal nano-twinning of αʺ plates takes place during αʺ decomposition owing to stress concentrations associated with structural heterogeneities within αʺ plates, i.e. spinodal decomposition of αʺ. The results obtained point to a relevant role of twin interfaces during phase precipitation.

Item URL in elib:https://elib.dlr.de/115694/
Document Type:Article
Title:Tracking the αʺ martensite decomposition during continuous heating of a Ti-6Al-6V-2Sn alloy
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Barriobero-Vila, Perepere.barrioberovila (at) dlr.deUNSPECIFIED
Biancardi Oliveira, VeronaUNSPECIFIEDUNSPECIFIED
Schwarz, SabineUNSPECIFIEDUNSPECIFIED
Buslaps, ThomasUNSPECIFIEDUNSPECIFIED
Requena, Guillermoguillermo.requena (at) dlr.deUNSPECIFIED
Date:August 2017
Journal or Publication Title:Acta Materialia
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In SCOPUS:Yes
In ISI Web of Science:Yes
Volume:135
DOI :10.1016/j.actamat.2017.06.018
Page Range:pp. 132-143
Publisher:Elsevier
ISSN:1359-6454
Status:Published
Keywords:Titanium alloys High-energy X-ray diffraction In situ transmission electron microscopy (TEM) Phase transformation kinetics Martensite decomposition
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Aeronautics
HGF - Program Themes:fixed-wing aircraft
DLR - Research area:Aeronautics
DLR - Program:L AR - Aircraft Research
DLR - Research theme (Project):L - Structures and Materials
Location: Köln-Porz
Institutes and Institutions:Institute of Materials Research > Metallic Structures and Hybrid Material Systems
Deposited By: Barriobero Vila, Pere
Deposited On:21 Nov 2017 14:27
Last Modified:21 Nov 2017 14:27

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