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:
Severe plastic deformation (SPD) has been demonstrated to be the most efficientmethod to produce bulk metals with ultrafine grained (UFG, 100 nm 〈 grain size d 〈 500 nm) andnanocrystalline (NC, d〈100 nm) microstructures. Such metals exhibit some unique propertiesowing to their unusual microstructures such as high-energy, non-equilibrium grain boundaries.Efforts in the past two decades have focused on metals with face-centered cubic (fcc) structures.Recent experimental results have shown that UFG/NC metals with body-centered cubic (bcc)structures have some properties that are distinct from their fcc counterparts. Further, the majority ofthe fcc metals are very ductile and have relatively low melting points, making them easier toprocess using SPD. On the contrary, many bcc metals are refractory, and are very sensitive tointerstitial impurities, rendering them difficult to work via SPD. In this article, we attempt tosummarize the state-of-the-art of UFG/NC refractory metals processed by SPD, with focus on themicrostructure and mechanical properties. Comparisons with UFG/NC fcc metals are made whereappropriate. Outstanding issues and future directions are also addressed
Type of Medium:
Electronic Resource
URL:
http://www.tib-hannover.de/fulltexts/2011/0528/02/18/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.579.75.pdf
