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.

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.

Possible Artefacts in Measurement of Hardness and Elastic Modulus on Superhard Coatings and the Verification of the Correctness of the Data

2002 ◽  
Vol 750 ◽  
Author(s):  
S. Veprek ◽  
S. Mukherjee ◽  
P. Karvankova ◽  
H.-D. Männling ◽  
J. L. He ◽  
...  
Keyword(s):  
Plastic Deformation ◽  
Young’S Modulus ◽  
Indentation Depth ◽  
Brillouin Scattering ◽  
Young's Modulus ◽  
Linear Extrapolation ◽  
Depth Sensing ◽  
Vibrating Reed ◽  
Superhard Coatings ◽  
Scanning Electron

ABSTRACTMeasurements of the hardness and Young's modulus of superhard coatings (HV≥40 GPa) by means of automated load-depth-sensing indentation technique can be subject to a number of errors that are discussed and exemplified here. Only load-independent values of hardness for loads larger than 30–50 mN can be considered reliable when the technique of Doerner and Nix (linear extrapolation of the unloading curve) is used to determine the corrected indentation depth. The results are compared with values of Vickers hardness calculated from the contact area of the remaining plastic deformation which was measured by means of calibrated scanning electron microscope. The values of Young's modulus obtained from the indentation are close to the zero-pressure shear modulus of the coatings as measured by means of Vibrating Reed and surface Brillouin scattering techniques.

Mechanical Spectroscopy of Annealing Effects in Electrodeposited Nickel/Ceramic Nanocomposites

2012 ◽  
Vol 184 ◽  
pp. 295-300 ◽  
Author(s):  
H.R. Sinning ◽  
G. Vidrich ◽  
Werner Riehemann
Keyword(s):  
Thermal Stresses ◽  
Hydrogen Trapping ◽  
Mechanical Spectroscopy ◽  
Dislocation Generation ◽  
Ultrafine Grained ◽  
Temperature Loss ◽  
Annealing Effects ◽  
Electrodeposited Nickel ◽  
Mechanical Spectra ◽  
Vibrating Reed

The annealing behaviour of temperature-dependent mechanical spectra (vibrating-reed technique) was studied on electrodeposited ultrafine-grained nickel as well as on Ni nanocomposites with small (7 nm) SiO2or larger (25 nm) Al2O3nanoparticles. From the response of the different phenomena involved – Young’s modulus, high-temperature damping background, dislocation-and hydrogen-induced low-temperature loss peaks, and magnetomechanical effects – information is obtained on processes such as recovery, grain growth, hydrogen trapping, and dislocation generation by thermal stresses, which are influenced by both kinds of nanoparticles in different ways.

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.

Comparison of Compressive Strength and Young’s Modulus of Cement Samples with Different Types of Aggregate

2016 ◽  
Vol 677 ◽  
pp. 207-210
Author(s):  
Jaroslav Topič ◽  
Andrej Osvald ◽  
Václav Nežerka ◽  
Zdeněk Prošek ◽  
Martin Lidmila ◽  
...  
Keyword(s):  
Compressive Strength ◽  
Portland Cement ◽  
Young’S Modulus ◽  
Quartz Sand ◽  
Young's Modulus ◽  
Recycled Concrete ◽  
Limestone Powder ◽  
Different Types

Several different types of aggregates were used for production of tested samples, namely: the standard sand of a fraction 0-4 mm, quartz sand of a fraction 0-0.4 mm, finely ground recycled limestone powder of a fraction 0-0.07 mm, finely ground recycled concrete of a fraction 0-0.13 mm (ground by Lavaris Company), and finally crushed bricks of a fraction 2-5 mm. The Portland cement CEM I 42.5 R produced in Radotín was used as a binder. Testing was carried out on prismatic samples of dimensions 40 × 40 × 160 mm. Compressive strength and static Young ́s modulus were measured for individual samples and these differed by the type of a microfiller and its amount.

Influence of Hot Pressing Parameters on Mechanical Properties of PP-HA Bio-Composites

2009 ◽  
Author(s):  
Mousa Younesi ◽  
Mohammad Ebrahim Bahrololoom ◽  
Hamidreza Fooladfar
Keyword(s):  
Mechanical Properties ◽  
Tensile Strength ◽  
Ultimate Tensile Strength ◽  
Young’S Modulus ◽  
Hot Pressing ◽  
Young's Modulus ◽  
Impact Resistance ◽  
Hot Press ◽  
Different Types ◽  
Press Molding

This paper focuses on the effects of pressure and temperature in hot press molding on the mechanical properties of polypropylene-hydroxyapatite composites with two different types of silanated and unsilanated hydroxyapatite. Density, crystallinity, ultimate tensile strength, Young’s modulus and impact resistance were evaluated for the two types of composites. Increasing pressure caused enhancement of density, crystallinity, MFI, ultimate tensile strength and Young’s modulus. Increases in temperature increased MFI, ultimate tensile strength and Young’s modulus whilst decreased impact resistance of composites. Effects of increasing pressure and temperature on the mechanical properties of polypropylene-silanated hydroxyapatite were less than their effects on the mechanical properties of polypropylene-unsilanated hydroxyapatite. Micrographs showed changes in fracture mode from ductile to brittle with increasing pressure and temperature during hot press molding.

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