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Strength and fatigue properties enhancement in ultrafine-grained Ti produced by severe plastic deformation

Journal Article · · Journal of Materials Science
 [1];  [1];  [1];  [1];  [2]
  1. Ufa State Aviation Technical University (Russia)
  2. Los Alamos National Laboratory (LANL), Los Alamos, NM (United States)
+ Show Author Affiliations
Severe plastic deformation (SPD) of titanium creates an ultrafine-grained (UFG) microstructure which results in significantly enhanced mechanical properties, including increasing the high cycle fatigue strength. This work addresses the challenge of maintaining the high level of properties as SPD processing techniques are evolved from methods suitable for producing laboratory scale samples to methods suitable for commercial scale production of titanium semi-products. Various ways to optimize the strength and fatigue endurance limit in long-length Grade 4 titanium rod processed by equal channel angular pressing (ECAP) with subsequent thermal mechanical treatments are considered in this paper. Low-temperature annealing of rods is found to increase the fatigue limit, simultaneously enhancing UFG titanium strength and ductility. The UFG structure in titanium provides an optimum combination of properties when its microstructure includes mostly equiaxed grains with high-angle boundaries, the volume fraction of which is no less than 50%.
Research Organization:
Los Alamos National Laboratory (LANL), Los Alamos, NM (United States)
Sponsoring Organization:
USDOE National Nuclear Security Administration (NNSA)
Grant/Contract Number:
89233218CNA000001
OSTI ID:
2470443
Journal Information:
Journal of Materials Science, Journal Name: Journal of Materials Science Journal Issue: 23-24 Vol. 43; ISSN 0022-2461
Publisher:
SpringerCopyright Statement
Country of Publication:
United States
Language:
English

References (8)

Influence of ECAP routes on the microstructure and properties of pure Ti journal February 2001
Cyclic behavior of ultrafine-grain titanium produced by severe plastic deformation journal November 2001
Superplastic behaviour of ultrafine-grained Ti–6A1–4V alloys journal January 2002
Advanced mechanical properties of pure titanium with ultrafine grained structure journal October 2001
The effect of annealing on tensile deformation behavior of nanostructured SPD titanium journal October 2003
Principles of equal-channel angular pressing as a processing tool for grain refinement journal September 2006
Nanostructuring of metals by severe plastic deformation for advanced properties journal August 2004
Combined SPD Techniques to Fabricate Nanostructured Ti Rods for Medical Applications journal July 2006

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Related Subjects

36 MATERIALS SCIENCE
Equal Channel Angular Pressing
Fatigue Limit
High Pressure Torsion
Materials Science
Polymers
Severe Plastic Deformation
Thermo Mechanical Treatment