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:
The strain amplitude dependent internal friction at room temperature and the transitiontemperatures of CuAlMn-shape memory alloys with Al contents from 8.9 wt.% to 12.7 wt.% and Mncontents from 4.7 wt.% to 9.3 wt.% were investigated. The investigated strain range was 10-6 - 10-3.Rods of various compositions were die cast and machined to single clamped damping bars. Theirtransition temperatures and amplitude dependent damping was determined in as cast and homogenizedstate. The damping in the investigated shape memory alloys was found to be generally much higherthan in metals without martensitic transition. In as cast state some alloys exceeded the damping of aSonoston type alloy measured in comparison for strains higher than 3 x 10-5. The influence of grain sizeon damping was investigated by additional sand casting and the use of Boron for grain refinement. Itwas found that only the material with the biggest grains had a noticeable higher damping over thewhole measured strain range. Homogenization heat treatment can still extremely increase the dampingof CuAlMn alloys. After homogenization this extremely high damping decreases slowly to mediumvalues in the order of as cast alloys
Type of Medium:
Electronic Resource
URL:
http://www.tib-hannover.de/fulltexts/2011/0528/01/51/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.319.45.pdf
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