Internal Friction and Elastic Modulus Change Associated with Structural Relaxation and Crystallization in Amorphous Mg-Ni-Y Alloys.

2000 ◽  
Vol 644 ◽  
Author(s):  
Y. M. Soifer ◽  
N. P. Kobelev ◽  
E. Korin ◽  
L. Soifer ◽  
D. Mogilyanskii ◽  
...  
Keyword(s):  
Internal Friction ◽  
Young’S Modulus ◽  
Structural Relaxation ◽  
Intermediate Phase ◽  
Young's Modulus ◽  
Crystallization Kinetic ◽  
Kinetic Studies ◽  
Mechanical Spectroscopy ◽  
Heating And Cooling ◽  
Vibrating Reed

AbstractMechanical spectroscopy technique has been applied to investigation of structural relaxation and crystallization of Mg-Ni-Y amorphous alloys of different composition. The composition of the alloys was varied due to change of yttrium concentration from 0 to 7 at.%. The internal friction (IF) and Young's modulus have been measured by a vibrating reed method at frequency of ∼200 Hz at heating and cooling runs in the temperature range from 300K to 650K. Crystallization kinetic studies of the alloys by DSC and XRD showed that the transition from amorphous to crystalline state in the Mg-Ni-Y alloys has gone through several stages with origination of intermediate phase. IF spectra and Young's modulus of the alloys have been analyzed and the effect of yttrium content on the stability of intermediate phase was investigated.

Anelastic Properties of Polycrystalline Copper

2004 ◽  
Vol 449-452 ◽  
pp. 673-676
Author(s):  
Chang Seog Kang ◽  
Sung Kil Hong
Keyword(s):  
Internal Friction ◽  
Young’S Modulus ◽  
Fatigue Testing ◽  
Young's Modulus ◽  
Testing Machine ◽  
Grain Boundary Sliding ◽  
Polycrystalline Copper ◽  
Mechanical Spectroscopy ◽  
Dynamic Young’S Modulus ◽  
Dynamic Young's Modulus

An attempt has been made to measure the temperature dependence of dynamic Young's modulus together with the related variation of internal friction in polycrystalline copper. A mechanical spectroscopy study was used a standard servo hydraulic fatigue testing machine equipped with a scanning laser extensometer. Dynamic Young’s modulus and internal friction are measured over a temperature range of 298 to 873K at very low frequencies of 0.1, 0.05 and 0.01Hz. One internal friction peak was observed over the ranges 450K to 700K, together with marked decreases in the dynamic Young.s modulus in the same temperature ranges. From a quantitative analysis of the experimental data with the relaxation strength, relaxation time and activation energy, it is concluded that the peak phenomenon is due to grain-boundary sliding relaxation.

Free Vibrating Reed Apparatus for the Measurement of Internal Friction and Young's Modulus down to 4 K

1970 ◽  
Vol 41 (9) ◽  
pp. 1342-1344 ◽  
Author(s):  
R. Buchdahl ◽  
R. J. Morgan ◽  
L. E. Nielsen
Keyword(s):  
Internal Friction ◽  
Young’S Modulus ◽  
Young's Modulus ◽  
Vibrating Reed

Mechanical Spectroscopy of the Formation of Quasicrystalline Order in Rapidly Quenched Ti- and Zr-based Alloys

2003 ◽  
Vol 805 ◽  
Author(s):  
Hans-Rainer Sinning ◽  
Igor S. Golovin ◽  
Adrian Jianu
Keyword(s):  
Young’S Modulus ◽  
Young's Modulus ◽  
Al Alloys ◽  
Mechanical Spectroscopy ◽  
Grain Sizes ◽  
Different Types ◽  
Annealing Effects ◽  
Initial States ◽  
Vibrating Reed ◽  
Icosahedral Quasicrystalline

ABSTRACTThe development of quasicrystalline (qc) order from different initial states (amorphous, nano- or poly-qc) was studied in rapidly quenched Ti-Zr-Ni(-Ag), Ti-Zr-Fe, and Zr-Cu-Ni-Al alloys by means of mechanical spectroscopy (vibrating-reed technique), including both the irreversible changes of Young's modulus and the Snoek-type relaxation peak of absorbed hydrogen as a probe, which are obviously sensitive to quite different types of ordering processes. The strongest annealing effects on Young's modulus were found for extreme nano-qc material at the amorphous limit, whereas order-induced narrowing of the hydrogen peak occurs only at comparatively larger grain sizes. More important differences in the properties of the hydrogen peak are found between quasicrystals of different compositions. The results are briefly discussed with respect to their implications for the amorphous-to-quasicrystalline transition and for the experimental distinction between different types of icosahedral quasicrystalline order.

Young's modulus and internal friction in alumina subjected to thermal shock

1984 ◽  
Vol 3 (4) ◽  
pp. 345-348 ◽  
Author(s):  
Ken'ichi Matsushita ◽  
Shusei Kuratani ◽  
Taira Okamoto ◽  
Masahiko Shimada
Keyword(s):  
Internal Friction ◽  
Thermal Shock ◽  
Young’S Modulus ◽  
Young's Modulus
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