Microstructure and mechanical properties of a commercially pure Ti processed by warm equal channel angular pressing

A commercially pure (CP) Titanium alloy classified as Grade 1, was processed by Equal Channel Angular Pressing (ECAP) up to 4 passes in the temperature range of 450–150°C. The resulting microstructures were observed by Electron Back-Scattered Diffraction, revealing a bimodal grain size distribution...

Full description

Saved in:
Bibliographic Details
Published in:Materials science & engineering. A, Structural materials : properties, microstructure and processing Structural materials : properties, microstructure and processing, 2015-02, Vol.625, p.311-320
Main Authors: Rodriguez-Calvillo, P., Cabrera, J.M.
Format: Article
Language:English
Subjects:
behavior
CP Ti
EBSD
Enginyeria dels materials
Equal channel angular pressing
fatigue-strength
Grain boundaries
Grains
initial microstructure
Materials science
Mathematical analysis
Mechanical properties
Microstructure
multipass ecap
Propietats mecàniques
purity titanium
Quality
refinement
room-temperature
severe plastic-deformation
Strengthening
Titani
Titanium
ultrafine-grained titanium
Warm ECAP
Yield stress
Àrees temàtiques de la UPC
Citations: Items that this one cites
Items that cite this one
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:A commercially pure (CP) Titanium alloy classified as Grade 1, was processed by Equal Channel Angular Pressing (ECAP) up to 4 passes in the temperature range of 450–150°C. The resulting microstructures were observed by Electron Back-Scattered Diffraction, revealing a bimodal grain size distribution consisting of small recrystallized grains of submicrometer size, with an average value of 0.3µm, and elongated bands of 1.4µm with different degree of substructure. Additionally the fraction of restored and deformed grains were evaluated as a function of processing temperature following an internal grain misorientation criterion, leading to an overall fraction of recrystallized grains between 40% and 20% in samples ECAPed at 450 and 150°C, respectively. The strengthening contributions of the grain size, equivalent oxygen content (Oeq) and Low Angle Grain Boundaries (LAGBs) to the yield stress were identified by the Hall Petch and Taylor equations. The strengthening coefficient k of the Hall–Petch relation was approximately 5MPamm−1/2, with an increment of 0.44MPamm−1/2 per 0.1 Oeq.-%, while the LAGB strengthening contribution was responsible approximately by half of the experimental yield stress values measured.
ISSN:0921-5093
1873-4936
DOI:10.1016/j.msea.2014.11.082