Relaxation transitions and internal friction spectra

1981 ◽  
Vol 23 (6) ◽  
pp. 1479-1485
Author(s):  
G.M. Bartenev ◽  
G.I. Radayeva
Keyword(s):  
Internal Friction ◽  
Relaxation Transitions ◽  
Internal Friction Spectra

scholarly journals Internal Friction and Microstructure of Ti and Ti-Mo Alloys Containing Oxygen

2016 ◽  
Vol 61 (1) ◽  
pp. 25-30 ◽  
Author(s):  
J.R.S. Martins ◽  
R.O. Araújo ◽  
R.A. Nogueira ◽  
C.R. Grandini
Keyword(s):  
Mechanical Properties ◽  
Solid Solution ◽  
Wear Resistance ◽  
Internal Friction ◽  
Good Combination ◽  
Relaxation Processes ◽  
Mechanical Spectroscopy ◽  
Excellent Corrosion Resistance ◽  
Low Elastic Modulus ◽  
Internal Friction Spectra

Ti-Mo alloys are promising materials for use as biomaterials, because these alloys have excellent corrosion resistance and a good combination of mechanical properties such as fatigue, low elastic modulus, hardness, and wear resistance. The objective of this paper was to study the effect of heavy interstitial atoms on anelastic properties of Ti-Mo alloys using mechanical spectroscopy. The internal friction and Young’s modulus were measured as a function of temperature using dynamic mechanical analyser. The internal friction spectra were brought about by relaxation processes attributed to shortrange stress induced reorientation of interstitial and substitutional complexes in solid solution. It is suggested that the nature of the relaxing entities can be worked out in further research on Ti-Mo single crystals.

Internal-friction spectra of poly(vinyl alcohol) with various molecular masses

2015 ◽  
Vol 57 (2) ◽  
pp. 123-130 ◽  
Author(s):  
V. A. Lomovskoy ◽  
N. A. Abaturova ◽  
N. Yu. Lomovskaya ◽  
O. A. Khlebnikova
Keyword(s):  
Internal Friction ◽  
Vinyl Alcohol ◽  
Poly Vinyl Alcohol ◽  
Molecular Masses ◽  
Internal Friction Spectra

Oxygen Diffusion in an Nb-Ta Alloy Measured by Mechanical Spectroscopy

2011 ◽  
Vol 312-315 ◽  
pp. 1228-1232
Author(s):  
Carlos Roberto Grandini ◽  
Luciano Henrique de Almeida ◽  
Durval Rodrigues Júnior
Keyword(s):  
Internal Friction ◽  
Crystalline Structure ◽  
Mechanical Spectroscopy ◽  
Substitutional Solute ◽  
Interstitial Atoms ◽  
Exponential Factors ◽  
Solute Interactions ◽  
Friction Measurements ◽  
Internal Friction Spectra ◽  
Interstitial Elements

When metals that present bcc crystalline structure receive the addition of interstitial atoms as oxygen, nitrogen, hydrogen and carbon, they undergo significant changes in their physical properties because they are able to dissolve great amounts of those interstitial elements, and thus form solid solutions. Niobium and most of its alloys possess a bcc crystalline structure and, because Brazil is the largest world exporter of this metal, it is fundamental to understand the interaction mechanisms between interstitial elements and niobium or its alloys. In this study, mechanical spectroscopy (internal friction) measurements were performed on Nb-8.9wt%Ta alloys containing oxygen in solid solution. The experimental results presented complex internal friction spectra. With the addition of substitutional solute, interactions between the two types of solutes (substitutional and interstitial) were observed, considering that the random distribution of the interstitial atoms was affected by the presence of substitutional atoms. Interstitial diffusion coefficients, pre-exponential factors and activation energies were calculated for oxygen in this alloy.

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