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:
A coarse grained Zr-Hf alloy has been subjected to one rolling pass with differentthickness reductions ranging from 10% to 80%. Rolling was performed at three temperatures:300ºC, room temperature (RT) and liquid nitrogen temperature (-196ºC). It has been found that,with increasing strain per pass, i.e., with increasing strain rate, the deformation mechanism changesfrom twinning to dislocation slip. The minimum strain per pass necessary to trigger the transition indeformation mechanism decreases with decreasing temperature. High strain, high strain-ratedeformation leads to the development of an ultrafine grained structure. Simultaneously, a basal typerolling texture forms. At the higher temperatures (RT and above) a recrystallization texturecomponent is also present. Thus, nanostructuring of this Zr-Hf alloy during severe rolling isattributed to a combination of grain subdivision by the formation of geometrically necessaryboundaries and to nucleation and growth phenomena taking place as a consequence of rapidadiabatic heating
Type of Medium:
Electronic Resource
URL:
http://www.tib-hannover.de/fulltexts/2011/0528/02/15/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.539-543.2843.pdf
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