Secondary Relaxation Peak

2016 ◽  
Author(s):  
Michael Hess ◽  
Giuseppe Allegra ◽  
Jiasong He ◽  
Kazuyuki Horie ◽  
Joon-Seop Kim ◽  
...  
Keyword(s):  
Relaxation Peak ◽  
Secondary Relaxation

Development of the Snoek Anelastic Relaxation Correlated with Oxygen in β-Ti Alloys

2019 ◽  
Vol 298 ◽  
pp. 59-63 ◽  
Author(s):  
Zheng Cun Zhou ◽  
J. Du ◽  
S.Y. Gu ◽  
Y.J. Yan
Keyword(s):  
Internal Friction ◽  
Physical And Mechanical Properties ◽  
Peak Height ◽  
Relaxation Peak ◽  
Interstitial Oxygen ◽  
Internal Friction Peak ◽  
Β Phase ◽  
Ti Alloys ◽  
Interstitial Atoms ◽  
The Stability

The β-Ti alloys exhibit excellent shape memory effect and superelastic properties. The interstitial atoms in the alloys have important effect on their physical and mechanical properties. For the interstitial atoms, the internal friction technique can be used to detect their distributions and status in the alloys. The anelastic relaxation in β-Ti alloys is discussed in this paper. β-Ti alloys possesses bcc (body center body) structure. The oxygen (O) atoms in in the alloys is difficult to be removed. The O atoms located at the octahedral sites in the alloys will produce relaxation under cycle stress. In addition, the interaction between the interstitial atoms and substitute atoms, e.g., Nb-O,Ti-O can also produce relaxation. Therefore, the observed relaxational internal friction peak during the measuring of internal friction is widened. The widened multiple relaxation peak can be revolved into Debye,s elemental peaks in Ti-based alloys. The relaxation peak is associated with oxygen movements in lattices under the application of cycle stress and the interactions of oxygen-substitute atoms in metastable β phase (βM) phase for the water-cooled specimens and in the stable β (βS) phase for the as-sintered specimens. The damping peak height is not only associated with the interstitial oxygen, but also the stability and number of βM in the alloys.

High-Temperature Mechanical Relaxation due to Dislocation Motion inside Dislocation Networks

2008 ◽  
Vol 137 ◽  
pp. 21-28 ◽  
Author(s):  
Andre Rivière ◽  
Michel Gerland ◽  
Veronique Pelosin
Keyword(s):  
Internal Friction ◽  
Relaxation Effect ◽  
Dislocation Motion ◽  
Relaxation Peak ◽  
Mechanical Relaxation ◽  
In Situ Tem ◽  
Mechanical Spectroscopy ◽  
Internal Friction Peak ◽  
First Case ◽  
Dislocation Walls

Internal friction peaks observed in single or polycrystals are clearly due to a dislocation relaxation mechanism. Because a sample observed by transmission electron microscopy (TEM) often exhibits in the same time various dislocation microstructures (isolated dislocations, dislocation walls, etc.) it is very difficult to connect the observed relaxation peak with a particular dislocation microstructure. Using isothermal mechanical spectroscopy (IMS), it is easier to compare, for instance, the evolution of a relaxation peak with measurement temperature to the microstructural evolution observed by in-situ TEM at the same temperatures. IMS was used to study a relaxation peak in a 5N aluminium single crystal firstly 1% cold worked and then annealed at various temperatures. TEM experiments performed in the same material at various temperatures equal to the temperatures used for the damping experiments made possible to link this internal friction peak with a relaxation effect occurring inside dislocation walls. In two other experiments in a 4N aluminium polycrystal and in a metal matrix composite with SiC whiskers, it is shown that the observed relaxation peaks are connected to the motion of dislocations inside polygonization boundaries in the first case and in dislocation pile-ups around each whisker in the second one. Theoretical models proposed to explain such relaxation peaks due to a dislocation motion inside a dislocation wall or network are discussed.

scholarly journals A Study on the Low Temperature Internal Friction Relaxation Peak in a Ti49.8Ni50.2 Alloy

2006 ◽  
Vol 47 (3) ◽  
pp. 711-715 ◽  
Author(s):  
Shyi-Kaan Wu ◽  
Hsin-Chih Lin ◽  
Tung-Sheng Chou
Keyword(s):  
Low Temperature ◽  
Internal Friction ◽  
Relaxation Peak

Slow secondary relaxation process in supercooled liquids

1997 ◽  
Vol 40 (6) ◽  
pp. 649-654 ◽  
Author(s):  
A Kudlik ◽  
C Tschirwitz ◽  
S Benkhof ◽  
T Blochowicz ◽  
E Rössler
Keyword(s):  
Relaxation Process ◽  
Supercooled Liquids ◽  
Secondary Relaxation

scholarly journals Amorphous physics and materials: Secondary relaxation and dynamic heterogeneity in metallic glasses: A brief review

2017 ◽  
Vol 26 (1) ◽  
pp. 016402 ◽  
Author(s):  
J C Qiao ◽  
Q Wang ◽  
D Crespo ◽  
Y Yang ◽  
J M Pelletier
Keyword(s):  
Metallic Glasses ◽  
Dynamic Heterogeneity ◽  
Secondary Relaxation

Secondary relaxation dynamics in rigid glass-forming molecular liquids with related structures

2015 ◽  
Vol 143 (10) ◽  
pp. 104505 ◽  
Author(s):  
Xiangqian Li ◽  
Meng Wang ◽  
Riping Liu ◽  
Kia L. Ngai ◽  
Yongjun Tian ◽  
...  
Keyword(s):  
Relaxation Dynamics ◽  
Molecular Liquids ◽  
Secondary Relaxation ◽  
Glass Forming

A New Low-Temperature Dislocation-Relaxation Peak in Aluminum

1989 ◽  
Vol 58 (12) ◽  
pp. 4269-4272 ◽  
Author(s):  
Toshio Kosugi ◽  
Takao Kino
Keyword(s):  
Low Temperature ◽  
Relaxation Peak

Physical ageing of PMMA and polycarbonate in the region of secondary relaxation

Polymer ◽  
1981 ◽  
Vol 22 (9) ◽  
pp. 1199-1204 ◽  
Author(s):  
L. Guerdoux ◽  
E. Marchal
Keyword(s):  
Physical Ageing ◽  
Secondary Relaxation

scholarly journals Secondary relaxation in the terahertz range in 2-adamantanone from theory and experiments

2020 ◽  
Vol 101 (10) ◽  
Author(s):  
Bingyu Cui ◽  
Jonathan F. Gebbia ◽  
Michela Romanini ◽  
Svemir Rudić ◽  
Ricardo Fernandez-Perea ◽  
...  
Keyword(s):  
Terahertz Range ◽  
Secondary Relaxation ◽  
Theory And Experiments

Universal secondary relaxation and unusual brittle-to-ductile transition in metallic glasses

2017 ◽  
Vol 20 (6) ◽  
pp. 293-300 ◽  
Author(s):  
Q. Wang ◽  
J.J. Liu ◽  
Y.F. Ye ◽  
T.T. Liu ◽  
S. Wang ◽  
...  
Keyword(s):  
Metallic Glasses ◽  
Secondary Relaxation ◽  
Brittle To Ductile Transition
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