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

被引:0
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作者
I. P. Semenova
R. Z. Valiev
E. B. Yakushina
G. H. Salimgareeva
T. C. Lowe
机构
[1] Ufa State Aviation Technical University,Institute of Physics of Advanced Materials
[2] Los Alamos National Laboratory,undefined
来源
关键词
Severe Plastic Deformation; Equal Channel Angular Pressing; Fatigue Limit; High Pressure Torsion; Thermo Mechanical Treatment;
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学科分类号
摘要
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%.
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页码:7354 / 7359
页数:5
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