scholarly journals The driving force governing room temperature grain coarsening in thin gold films

2017 ◽  
Vol 130 ◽  
pp. 42-45 ◽  
Author(s):  
O. Glushko ◽  
M.J. Cordill
Keyword(s):  
Driving Force ◽  
Room Temperature ◽  
Gold Films ◽  
Grain Coarsening

Temperature-induced structural phase transitions in RERhSn (RE = Y, Gd-Tm, Lu)

2021 ◽  
Vol 0 (0) ◽  
Author(s):  
Simon Engelbert ◽  
Rolf-Dieter Hoffmann ◽  
Jutta Kösters ◽  
Steffen Klenner ◽  
Rainer Pöttgen
Keyword(s):  
Rare Earth ◽  
Phase Transitions ◽  
Driving Force ◽  
Room Temperature ◽  
Structural Phase ◽  
Structural Phase Transitions ◽  
Line Broadening ◽  
X Ray Diffraction ◽  
Temperature Dependent ◽  
X Ray

Abstract The structures of the equiatomic stannides RERhSn with the smaller rare earth elements Y, Gd-Tm and Lu were reinvestigated on the basis of temperature-dependent single crystal X-ray diffraction data. GdRhSn crystallizes with the aristotype ZrNiAl at 293 and 90 K. For RE = Y, Tb, Ho and Er the HP-CeRuSn type (approximant with space group R3m) is already formed at room temperature, while DyRhSn adopts the HP-CeRuSn type below 280 K. TmRhSn and LuRhSn show incommensurate modulated variants with superspace groups P31m(1/3; 1/3; γ) 000 (No. 157.1.23.1) (γ = 3/8 for TmRhSn and γ = 2/5 for LuRhSn). The driving force for superstructure formation (modulation) is a strengthening of Rh–Sn bonding. The modulation is expressed in a 119Sn Mössbauer spectrum of DyRhSn at 78 K through line broadening.

Grain coarsening and gas bubbles in annealed gold films

1975 ◽  
Vol 31 (6) ◽  
pp. 1295-1306 ◽  
Author(s):  
R. Andrew ◽  
Viktor Krasevec
Keyword(s):  
Gas Bubbles ◽  
Gold Films ◽  
Grain Coarsening

Non-Destructive Evaluation of 304 Stainless Steels Using a Scanning Hall-Sensor Microscope: Visualization of Strain-Induced Austenite-Phase Breakdown

1999 ◽  
Vol 591 ◽  
Author(s):  
A. Oota ◽  
K. Miyake ◽  
D. Sugiyama ◽  
H. Aoki
Keyword(s):  
Plastic Deformation ◽  
Shear Stress ◽  
Stainless Steels ◽  
Driving Force ◽  
Room Temperature ◽  
Martensite Phase ◽  
Hall Sensor ◽  
Austenite Phase ◽  
Non Destructive Evaluation ◽  
Non Destructive

ABSTRACTUsing a scanning Hall-sensor microscope with an active area 50pμm × 50μm, we succeeded in visualizing a breakdown of paramagnetic austenite-phase in 304 stainless steels induced by a plastic strain at room temperature, resulting from a transformation to ferromagnetic martensite-phase. Magnetic images of spontaneous magnetic fields on a surface of strained sample show the degree and the place (and/or the extent) of phase breakdown. Furthermore, the images nearly agree with the calculated results for the principal shear stress rather than the principal stress under plastic deformation, indicative of the driving force of this breakdown. The study should open a way for non-destructive evaluation of 304 stainless steels.

Relaxation in Nanoscale Freestanding Gold Films Using MEMS

Materials ◽  
2005 ◽  
Author(s):  
B. S. Samuel ◽  
A. V. Desai ◽  
M. A. Haque
Keyword(s):  
Thin Films ◽  
Stress Relaxation ◽  
Room Temperature ◽  
Gold Films ◽  
Test Bed ◽  
Scanning Microscope ◽  
Substrate Effects ◽  
Stress Relaxation Behavior ◽  
Loading Device ◽  
Film Specimen

We present experimental results to describe the stress relaxation behavior of thin (125 nm) freestanding gold films at room temperature. The experiments were performed inside a field emission scanning microscope using a MEMS-based test bed which is only 3mm × 10mm in size. The effect of stress relaxation on the young’s modulus of gold thin films is observed. The thin film specimen used in the experiment is co-fabricated with the micromechanical loading device and hence eliminates problems of alignment and gripping. Freestanding thin films provide us with information about the mechanical behavior of thin films in the absence of substrate effects.

scholarly journals Influence of Wavy Bending on Microstructure and Mechanical Properties of a Rolled AZ31 Sheet

Metals ◽  
2020 ◽  
Vol 10 (2) ◽  
pp. 173 ◽  
Author(s):  
Tingting Liu ◽  
Yuyang Zhang ◽  
Yanan Chen ◽  
Zhiwen Du ◽  
Hongbing Chen ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Room Temperature ◽  
Tensile Ductility ◽  
Recrystallization Annealing ◽  
Basal Texture ◽  
Grain Coarsening ◽  
Microstructure And Mechanical Properties ◽  
Combined Use ◽  
Az31 Sheet ◽  
Stretch Formability

In the present work, cross-wavy bending at room temperature was carried out to tailor the microstructure and stretch formability of rolled AZ31 sheets. Wavy bending processing generates profuse {10–12} twins and a tilt basal texture. Subsequent recrystallization annealing causes grain coarsening and enhances the intensity of twin-orientation. The combined use of wavy bending and annealing can maintain high tensile ductility and remarkably enhances the stretch formability of rolled AZ31 sheet. It can be mainly attributed to the non-basal texture in the wavy bent sheet which increases the thinning capability during in-plane tension.

The Influence of Test Temperature on the Ratchetting Behavior of Type 304 Stainless Steel

1989 ◽  
Vol 111 (4) ◽  
pp. 378-383 ◽  
Author(s):  
M. B. Ruggles ◽  
E. Krempl
Keyword(s):  
Stress Level ◽  
Driving Force ◽  
Room Temperature ◽  
Maximum Stress ◽  
Elevated Temperatures ◽  
304 Stainless Steel ◽  
Short Time ◽  
Independent Behavior ◽  
Type 304 ◽  
Type 304 Stainless Steel

The zero-to-tension ratchetting behavior was investigated under uniaxial loading at room temperature and at 550, 600, and 650°C. In History I the maximum stress level of ratchetting was equal to the stress reached in a tensile test at one percent strain. For History II the maximum stress level was established as the stress reached after a 2100 s relaxation at one percent strain. Significant ratchetting was observed for History I at room temperature but not at the elevated temperatures. The accumulated ratchet strain increases with decreasing stress rate. Independent of the stress rates used insignificant ratchet strain was observed at room temperature for History II. This observation is explained in the context of the viscoplasticity theory based on overstress by the exhaustion of the viscous contribution to the stress during relaxation. The viscous part of the stress is the driving force for the ratchetting in History I. Strain aging is presumably responsible for the lack of short-time inelastic deformation resulting in a nearly rate-independent behavior at the elevated temperatures.

Investigation of the Mechanical Properties of Thin Films by Bulge Test

2009 ◽  
Vol 156-158 ◽  
pp. 477-482
Author(s):  
Audrey Hémel ◽  
Alain Jacques ◽  
Thomas Schenk ◽  
Tomáš Kruml
Keyword(s):  
Thin Films ◽  
Mechanical Properties ◽  
Room Temperature ◽  
Mechanical Tests ◽  
Bulge Test ◽  
Gold Films ◽  
Test Device

A new bulge test device has been built, with the aim to perform mechanical tests on membranes with a thickness in the 100 nm to 10 µm range, between room temperature and 900°C. The first tests on Si3N4 and gold films give results consistent with literature data.

ELECTROLYTIC TRANSPORT THROUGH CYLINDRICAL ETCHED PORES IN POLYETHYLENE TEREPTHALATE TRACK-ETCHED MEMBRANE

2008 ◽  
Vol 22 (14) ◽  
pp. 1415-1421 ◽  
Author(s):  
SANJEEV KUMAR ◽  
S. K. CHAKARVARTI
Keyword(s):  
Electric Potential ◽  
Driving Force ◽  
Room Temperature ◽  
Cylindrical Shape ◽  
Pore Density ◽  
Appreciable Change ◽  
Cylindrical Pores ◽  
Different Diameters ◽  
Track Etched Membrane ◽  
Etched Membrane

In the present work, electrolytic transport phenomena is studied for different electrolytes ( LiCl , NaCl , KCl of different concentrations) at room temperature (25 ± 2° C ) through etched pores with different diameters having cylindrical shape in track-etched membranes of polyethylene terepthalate (PET) with pore density of the order of 106/cm2. Electric potential has been used as the driving force. It has been observed that electrolytic transport through pores is different for different electrolytes, depending strongly on size of cations and is independent of size of anions. In the case of cylindrical pores, there has not been found appreciable change in forward and backward resistances.

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