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:
The present work reports on the preparation of the Ta5SiB2 compound by highenergyball milling and subsequent heat treatment from elemental Ta-12.5at%Si-25at%Bpowder mixture. The milling process was carried out at room temperature in a planetary ballmill under argon atmosphere. Following the milling process, the powders were heat-treated at1200oC for 4h under Ar atmosphere in order to obtain the equilibrium microstructure. Themilled and heat-treated powders were characterized by X-ray diffraction (XRD) and scanningelectron microscopy (SEM). Results indicated that the Si peaks disappeared after milling for1h. It was noted that the broadening and the reduced intensity of Ta peaks occurredcontinuously up to milling for 10h, suggesting that the Si and B atoms were preferentiallydissolved into the Ta lattice during ball milling to form a supersaturated solid solution. A halowas formed in Ta-12.5at%Si-25at%B powders milled for 100h, suggesting that an amorphousphase was achieved. No intermetallic phase was formed in powders milled for 200h. A largeamount of Ta5SiB2 was formed after heat treatment at 1200oC for 4h. In addition, peaks ofTaB and another unknown phase were also identified
Type of Medium:
Electronic Resource
URL:
http://www.tib-hannover.de/fulltexts/2011/0528/02/14/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.530-531.197.pdf
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