ISSN:
1662-9752
Source:
Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
Topics:
Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
Notes:
Plasticity of ultra-fine grained (UFG) zirconium (grain size ~ 0.4 µm), produced byintensive plastic deformation (IPD) - a combination of extrusion, annealing, and drawing, have beenstudied within the temperature range 300 – 4.2 K in uniaxial compression. It was found thatdecrease of grain sizes in the result of IPD leads to considerable increase of strength characteristicsfor the UFG zirconium in comparison with coarse-grained (CG) zirconium (in 6 times at 300 K and4 times at 77 K); and plasticity of the UFG zirconium keeps rather large (strain 〉 0.15). Two stagesof the strain-hardening and decrease of the activation volume for plastic flow with deformation havebeen registered. A conclusion was made about the identity of basic deformation mechanisms in theUFG and CG zirconium: simultaneous action and mutual influence of intragrain dislocation glidingand twinning
Type of Medium:
Electronic Resource
URL:
http://www.tib-hannover.de/fulltexts/2011/0528/02/19/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.584-586.452.pdf
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