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Daniele Mari

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Publications associées (57)

Multi-walled carbon nanotube/nanostructured zirconia composites: Outstanding mechanical properties in a wide range of temperature

Robert Schaller, Daniele Mari, Gilbert Fantozzi, Mehdi Mazaheri

Multi-walled carbon nanotube (MWCNT)/nanostructured zirconia composites with a homogenous distribution of different MWCNT quantities (ranging within 0.5-5 wt.%) were developed. By using Spark Plasma Sintering we succeeded in preserving the MWCNTs firmly at ...

Elsevier2011

High-Temperature Mechanical Spectroscopy of Nitrogen-Rich Ca-alpha-SiAlON Ceramics

Robert Schaller, Daniele Mari, Mehdi Mazaheri

Nitrogen-rich Ca-alpha-SiAlON ceramics made with different starting powder compositions have been studied by high-temperature mechanical spectroscopy in parallel with compressive deformation in a spark plasma sintering equipment. The mechanical loss spectr ...

2011

Glass transition associated with the jamming of vibrated granular matter

Gérard Gremaud, Daniele Mari, Alessandro Luigi Sellerio

We investigate a vibrated granular system composed of millimeter-size glass beads. When the system is submitted to a perturbation with decreasing intensity, below the fluidization limit, it evolves in a way similar to glass-forming liquids until it reaches ...

2011

Thermal stress relaxation in magnesium matrix composites controlled by dislocation breakaway

Robert Schaller, Daniele Mari, Abu Salek Md. Fahim Chowdhury

In metal matrix composites (MMCs) thermal stress relaxation can be achieved either by interface debonding, crack propagation or by dislocation motion. The present paper shows that in the case of magnesium matrix, interface thermal stresses are relaxed by d ...

2010

The effect of the orientation of the basal plane on the mechanical loss in magnesium matrix composites studied by mechanical spectroscopy

Robert Schaller, Daniele Mari, Abu Salek Md. Fahim Chowdhury

In metal matrix composites, thermal stresses are relaxed by either interface debonding, crack propagation or dislocation motion. The present paper shows that in the case of a magnesium matrix, interface thermal stresses are relaxed by dislocation motion in ...

2010

Modulus anomaly in magnesium matrix composites

Robert Schaller, Daniele Mari, Abu Salek Md. Fahim Chowdhury

Several magnesium matrix composites were investigated by means of mechanical spectroscopy. A modulus anomaly has been observed in the composites reinforced with fibers while the phenomenon does not occur with particles. This effect is attributed to bonding ...

Wiley2010

High temperature mechanical spectroscopy of yttria stabilized zirconia reinforced with carbon nanotubes

Robert Schaller, Daniele Mari, Mehdi Mazaheri

High temperature mechanical properties of zirconia reinforced with carbon-nanotubes (CNTs) are studied by mechanical spectroscopy. CNTs limit zirconia grain-boundary sliding (GBS) and consequently deformation. Concurrent grain-growth and plastic deformatio ...

Wiley2010

Measurement of residual thermal stress in WC-Co by neutron diffraction

Daniele Mari

The temperature dependence of residual stresses in a WC-17.8vol.%Co cemented carbide was measured by neutron diffraction. The comparison of the WC lattice parameter within the WC-Co and within stress-free WC reference provides a measurement of lattice elas ...

2009

Mechanical spectroscopy in carbon nanotube reinforced ABS

Robert Schaller, Daniele Mari

Mechanical spectroscopy has been used to qualify possible improvements of the mechanical properties of acrylonitrile-butadiene-styrene-carbon nanotubes (ABS-CNTs) composites. The properties of ABS matrix are first investigated. Two relaxations that mark th ...

2009

Stress-induced and atomic ordering in 18-carat Au-Cu-Ag alloys

Robert Schaller, Daniele Mari, John Hennig

Atomic ordering and stress-induced ordering (Zener relaxation) were studied in a series of 18-carat (75 wt%) yellow gold alloys (Au-Cu-Ag) by means of isothermal mechanical spectroscopy with a forced torsion pendulum at low frequencies. In the high-tempera ...

2009

Investigation of hydrogen storage in carbon nanotube-magnesium matrix composites

Robert Schaller, Daniele Mari, Iva Tkalcec Vâju

Magnesium (Mg) and magnesium nickel (Mg-23.5 wt%Ni) reinforced with multiwalled carbon nanotubes (CNTs) were processed by powder metallurgy and then charged with hydrogen by annealing at 620 K under a pressure of 0.4 MPa of hydrogen. Mechanical spectroscop ...

2009

Analysis of transient mechanical loss due to thermal stresses in metal matrix composites

Robert Schaller, Daniele Mari, Abu Salek Md. Fahim Chowdhury

Mechanical spectroscopy has been used to study the thermal stress relaxation at the interfaces in magnesium matrix composites. The mechanical loss spectra measured as a function of temperature show an intrinsic component superimposed on transient damping. ...

2009

Mechanical spectroscopy of 18-carat AuCuPd white gold alloys

Robert Schaller, Daniele Mari, Iva Tkalcec Vâju, John Hennig

The mechanical loss and dynamic modulus temperature spectra of two 18-carat white gold alloys, Au58%Cu24%Pd18% without (grade A) and with alloying additions (grade B), were measured in the 400-1000 K temperature range. A peak interpreted as a Zener relaxat ...

2009

Order-disorder phase transition and stress-induced diffusion in Au-Cu

Robert Schaller, Daniele Mari, John Hennig

Isothermal mechanical spectroscopy by means of a forced torsion pendulum (measuring internal friction/mechanical loss) was used to study the interplay of long-range atomic order and stress-induced diffusion (Zener relaxation) in Au57%Cu43%. Our results sho ...

2009

Influence of the carbon content on dislocation relaxation in martensitic steels

Robert Schaller, Daniele Mari, Ronan Martin

Mechanical-loss measurements were performed in three grades of martensitic high-carbon tool steels. These steels were treated under carburizing gas before quenching, in order to vary the concentration of interstitial carbon in the martensite, as assessed b ...

2009

Tempering effects on three martensitic carbon steels studied by mechanical spectroscopy

Robert Schaller, Daniele Mari, Iva Tkalcec Vâju

Tempering effects have been studied in three martensitic carbon steels by mechanical spectroscopy. The mechanical-loss spectra present a relaxation peak similar to the Snoek-Koster peak in ferrite. The peak amplitude decreases upon tempering, indicating a ...

2008

Thermal stress relaxation in magnesium matrix composites studied by mechanical spectroscopy

Robert Schaller, Daniele Mari, Abu Salek Md. Fahim Chowdhury

Thermal stress relaxtion at the interfaces in magnesium matrix composite has been studied by mechanical spectroscopy. Two specimens were processed by a gas pressure infiltration method. In one sample, the metallic matrix was unidirectionally oriented with ...

Wiley2008

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