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:
High purity (99.99, wt %) niobium ingots were received by double electron beam meltingtechnology. The specimens of pure metals with cast microstructure were processed using coldequal-channel angular pressing (ECAP) followed by a heat treatment at around 1080 °C in vacuumfurnace for 2 h. Shear bands and microstructure evolution was studied in shear region at first passand at next passes of ECAP. Microstructure processing characterization was performed using lightoptical and field emission scanning electron microscopy. Accompanied to microstructure thechanges of mechanical properties were determined by micro- and universal hardness testing. Theshear bands forming, evolution of large crystals to elongated laminar and dislocation fine-grainstructures during processing was characterized and discussed in view of metal hardening-softeningand viscoplastic behavior under subsequent hard cyclic straining
Type of Medium:
Electronic Resource
URL:
http://www.tib-hannover.de/fulltexts/2011/0528/02/19/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.584-586.349.pdf
