Elastic constants and internal friction of martensitic steel, ferritic-pearlitic steel, and α-iron

2007 ◽  
Vol 452-453 ◽  
pp. 633-639 ◽  
Author(s):  
Sudook A. Kim ◽  
Ward L. Johnson
Keyword(s):  
Internal Friction ◽  
Elastic Constants ◽  
Martensitic Steel ◽  
Pearlitic Steel

scholarly journals Ultrasonic Characterization of Nanoparticle-Based Ceramics Fabricated by Spark-Plasma Sintering

Ceramics ◽  
2021 ◽  
Vol 4 (2) ◽  
pp. 135-147
Author(s):  
Hanuš Seiner ◽  
Michaela Janovská ◽  
Martin Koller ◽  
Petr Sedlák ◽  
Kateřina Seinerová ◽  
...  
Keyword(s):  
Activation Energy ◽  
Boron Nitride ◽  
Internal Friction ◽  
Elastic Constants ◽  
Carbon Nitride ◽  
Plasma Sintering ◽  
Spark Plasma ◽  
Friction Parameters ◽  
Boron Carbon Nitride ◽  
Boron Carbon

Resonant ultrasound spectroscopy was used to determine elastic constants and internal friction parameters of bulk nanoparticle-based ceramic materials compacted by spark plasma sintering. Boron nitride-based and boron carbon nitride-based materials were studied, and the results were compared with similar bulk materials prepared from graphene nanoplatelets. The results showed that such nanoparticle-based materials can be strongly anisotropic, and can have very different elastic constants depending on the nanoparticles used. From the temperature dependence of the internal friction parameters, the activation energy for sliding of the individual monolayers along each other was determined for each material. Very similar values of the activation energy were obtained for boron nitride, boron carbon nitride, and graphene, ranging from 15 to 17 kJ/mol.

Internal friction and Mössbauer study of C–Cr associates in MANET steel

1997 ◽  
Vol 12 (2) ◽  
pp. 296-299 ◽  
Author(s):  
P. Gondi ◽  
R. Gupta ◽  
R. Montanari ◽  
G. Principi ◽  
M. E. Tata
Keyword(s):  
Internal Friction ◽  
Slow Rate ◽  
Structural Model ◽  
Martensitic Steel ◽  
Experimental Results ◽  
Thermal Treatments ◽  
Mössbauer Study ◽  
Low Intensity ◽  
Magnetic Pattern ◽  
Bcc Phase

Internal friction and Mössbauer techniques have been used to investigate the structure of C–Cr associates and the arrangement of Fe atoms near them in the Cr martensitic steel MANET subjected to different thermal treatments. After slow rate cooling from the austenitic field, the Mössbauer spectra exhibit, besides the complex magnetic pattern of martensite, a low intensity singlet attributed to the presence of a Cr-rich bcc phase. In correspondence, the internal friction curves, show, among others, a Snoek-type peak due to anelastic processes involving C–Cr associates with 6 Cr atoms. To explain the experimental results, a simple structural model is suggested.

scholarly journals Elastic constants, internal friction, and piezoelectric coefficient ofα−TeO2

2004 ◽  
Vol 69 (2) ◽  
Author(s):  
Hirotsugu Ogi ◽  
Masashi Fukunaga ◽  
Masahiko Hirao ◽  
Hassel Ledbetter
Keyword(s):  
Internal Friction ◽  
Elastic Constants ◽  
Piezoelectric Coefficient
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