Fine Structure of the Internal Friction Peak around Room Temperature in Cold-Worked and Partially Annealed Al-0. 13wt%Cu

1991 ◽  
Vol 126 (1) ◽  
pp. K31-K36 ◽  
Author(s):  
T. S. Kě (Ge Tingsui) ◽  
S. Q. Yang
Keyword(s):  
Fine Structure ◽  
Internal Friction ◽  
Room Temperature ◽  
Internal Friction Peak ◽  
Cold Worked

scholarly journals The Internal Friction of Single Crystals, Bicrystals and Polycrystals of Pure Magnesium

2015 ◽  
Vol 60 (1) ◽  
pp. 371-375 ◽  
Author(s):  
W.B. Jiang ◽  
Q.P. Kong ◽  
L.B. Magalas ◽  
Q.F. Fang
Keyword(s):  
Activation Energy ◽  
Internal Friction ◽  
Grain Boundary ◽  
Grain Boundaries ◽  
Single Crystals ◽  
Room Temperature ◽  
Internal Friction Peak ◽  
Self Diffusion ◽  
Boundary Relaxation ◽  
The Difference

Abstract The internal friction of magnesium single crystals, bicrystals and polycrystals has been studied between room temperature and 450°C. There is no internal friction peak in the single crystals, but a prominent relaxation peak appears at around 160°C in polycrystals. The activation energy of the peak is 1.0 eV, which is consistent with the grain boundary self-diffusion energy of Mg. Therefore, the peak in polycrystals can be attributed to grain boundary relaxation. For the three studied bicrystals, the grain boundary peak temperatures and activation energies are higher than that of polycrystals, while the peak heights are much lower. The difference between the internal friction peaks in bicrystals and polycrystals is possibly caused by the difference in the concentrations of segregated impurities in grain boundaries.

Internal Friction Peak of Halogen-Doped Graphite Rising near Room Temperature

1973 ◽  
Vol 12 (9) ◽  
pp. 1465-1466 ◽  
Author(s):  
Masayoshi Baba ◽  
Michihiro Saito ◽  
Takuro Tsuzuku
Keyword(s):  
Internal Friction ◽  
Room Temperature ◽  
Internal Friction Peak

High Temperature Internal Friction Relaxations in Cold-Rolled Titanium

2018 ◽  
Vol 279 ◽  
pp. 30-34
Author(s):  
Zheng Cun Zhou ◽  
J. Du ◽  
S.Y. Gu ◽  
Y.J. Yan
Keyword(s):  
Grain Size ◽  
Phase Transformation ◽  
High Temperature ◽  
Internal Friction ◽  
Room Temperature ◽  
Forced Oscillations ◽  
Internal Friction Peak ◽  
Temperature Relaxation ◽  
Cold Rolled ◽  
Cp Ti

The high temperature relaxation in cold-rolled Ti (CR-Ti) and commercial pure Ti (CP-Ti) has been investigated using internal friction apparatus operating in forced oscillations from room temperature to 650°C. It is shown that there is an internal friction peak at around 510°C for the CR-Ti and there is no 510°C internal friction peak in the CP-Ti. The internal friction peak shows typical features of phase transformation in the CR-Ti. It is tentatively suggested that this peak is due to the ordering of disordered lattices resulted from cold-rolling. The high temperature background damping (HTBD) in the CP-Ti is much lower than that in the CR-Ti. It is concluded that the HTBD is related to the microstructure observed inside the grains and does not dependent on grain size.

scholarly journals Nature of the Internal Friction Peak in Cold-Worked Dilute Aluminum Alloys

1999 ◽  
Vol 40 (6) ◽  
pp. 498-507 ◽  
Author(s):  
Xingsheng Guan ◽  
Hiroshi Numakura ◽  
Masahiro Koiwa
Keyword(s):  
Aluminum Alloys ◽  
Internal Friction ◽  
Internal Friction Peak ◽  
Cold Worked

High Temperature Phase Transformation in a Cold-Rolled Fe-Mn-Si Alloy

2013 ◽  
Vol 803 ◽  
pp. 243-246
Author(s):  
Z.C. Zhou ◽  
D.K. Yang ◽  
J. Du ◽  
Y.J. Yan ◽  
S.Y. Gu ◽  
...  
Keyword(s):  
Phase Transformation ◽  
High Temperature ◽  
Internal Friction ◽  
Cold Rolling ◽  
Forced Vibration ◽  
Room Temperature ◽  
High Temperature Phase ◽  
Temperature Phase ◽  
Internal Friction Peak ◽  
Cold Rolled

The internal friction of a cold-rolled Fe-Mn-Si alloy has been investigated using a multifunctional internal friction apparatus though forced vibration method from room temperature to 950 °C. It has been shown that an internal friction peak is found on the IF-T curves during first heating at around 640 °C for the cold-rolled Fe-Mn-Si alloy. The internal friction peak is confirmed to be crystallizing peak of amorphous. The amorphous is resulted from the cold-rolling of the Fe-Mn-Si alloy.

Internal Friction and Mechanical Strength of Hydrogenated Ti-Rich Multicomponent Glassy Alloys

2006 ◽  
Vol 319 ◽  
pp. 139-144 ◽  
Author(s):  
Masuyuki Hasegawa ◽  
M. Takeuchi ◽  
D. Nagata ◽  
T. Wada ◽  
Hidemi Kato ◽  
...  
Keyword(s):  
Activation Energy ◽  
Tensile Strength ◽  
Internal Friction ◽  
Mechanical Strength ◽  
Room Temperature ◽  
Peak Temperature ◽  
Internal Friction Peak ◽  
Exponential Factor ◽  
Similar Composition ◽  
Glassy Alloys

The hydrogen-induced internal friction and mechanical strength of the Ti-rich Ti34Zr11Cu47Ni8 and (Ti34Zr11Cu47Ni8)98Si2 hydrogenated glassy alloys have been investigated. It is found that the tensile strength is more than 0.8 GPa at room temperature when the hydrogen content is below about 20 at% for both alloys. The frequency dependence of peak temperature of the hydrogen-induced internal friction of (Ti34Zr11Cu47Ni8)98Si2-17.3 at%H hydrogenated glassy alloys has been clarified. Activation energy and pre-exponential factor are estimated to be 0.35 eV and 1.3x10-12, respectively. Compared with these values with those of Zr40Cu49Al10Si1 hydrogenated glassy alloys which show an internal friction peak around 300 K at about 300 Hz, it is found that the activation energy is much smaller than that of the latter although the pre-exponential factor is almost the same. Considering their similar composition and different component (Al), it is suggested that the component Al of the latter glassy alloys is effective for the higher activation energy which results in the increase of the peak temperature.

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