ISSN:
1013-9826
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:
Effects of hydrogen doping on the internal friction (IF) of ternary Ti50Ni50-xCux (x=15, 20,25)[removed info] shape memory alloys, prepared by rolling and annealing laminating Ti and Ni-Cu alloy sheets,have been measured with a damping mechanical analyzer in a forced bending oscillation mode attemperatures from 173K to 423K at three frequencies, 0.1, 1 and 5Hz. The effects of hydrogendoping on IF are common to the three alloys: a hydrogen IF peak appears at around 260K; the IFpeak value (tanφ) increases rapidly with increasing hydrogen concentration up to tanφ=0.03 at0.5at% and then decreases; the peak temperature also increases rapidly and then gradually decreases.From the frequency dependence of the peak temperature, the activation energy E and thepre-exponential factor ω0 have been analyzed to be E=0.6-0.7eV and ω0=1013-14s-1. The origin of thehydrogen IF is interpreted to be the Snoek-Koester effect due to interaction of twin boundarydislocations and segregated hydrogen atoms. Effects of hydrogen on mechanical properties of thealloys have also been studied
Type of Medium:
Electronic Resource
URL:
http://www.tib-hannover.de/fulltexts/2011/0528/01/51/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.319.39.pdf
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