Mechanical relaxation and freezing in the room temperature strain glass alloy Ti50(Pd40Cr10)

The influence of temperature, grain size and strain rate on superplasticity of magnesium is investigated. Different approaches are compared along with their experimental results to show the variation in the amount of superplasticity by varying above mentioned parameters. At room temperature magnesium alloys usually have poor formability but recent studies of some alloys such as ZE10, AZ31, AZ61 AZ60, AZ80 and AZ91 are pointing that by varying the temperature along with grain size and strain rate improved formability is possible or even superplastic forming of these alloys can be achieved to meet the demands of automotive, aircraft and other weight conscious industries.

Download Full-text

Equipment for Measuring Complex Moduli of Thin Coatings at Elevated Temperatures

Journal of Engineering for Industry ◽

10.1115/1.3438469 ◽

1974 ◽

Vol 96 (3) ◽

pp. 969-975 ◽

Cited By ~ 1

Author(s):

P. Sridharan ◽

R. Plunkett

Keyword(s):

Room Temperature ◽

Elevated Temperatures ◽

Low Frequency ◽

Complex Moduli ◽

Thin Coatings ◽

Advantages And Disadvantages ◽

State Of Stress ◽

Torsional Pendulum ◽

Flat Beam ◽

Temperature Strain

Porcelain enamels are thin, inorganic, glassy coatings, extensively used to protect metal surfaces exposed to the corrosive and erosive effects of hot gases. They are known to increase the fatigue life and vibratory damping of the coated member in some cases but the amount of improvement and the governing parameters are not known. Three pieces of equipment for measuring the damping and complex moduli of porcelain enamel coatings as a function of temperature, strain level and state of stress have been developed as part of a program now underway to determine these properties. All three are designed to cover the temperature range from room temperature to 2000 deg F. The first is an adaptation of the low frequency torsional pendulum equipment useful from about 1 to 20 Hz. The second uses a flat beam in bending to cover the frequency range from 10 Hz to 200 Hz and the third uses a hollow torsional specimen to cover the range from 150 Hz to 600 Hz. This paper describes the design details, advantages and disadvantages and error analysis of each of the three pieces of equipment.

Download Full-text

Hole Expansion Performance of Three High Strength Steels: Observation of Room Temperature Strain Aging Phenomena

10.33313/280/006 ◽

2021 ◽

Author(s):

Rachael Stewart ◽

◽

Robert Comstock ◽

Keyword(s):

Strain Aging ◽

Room Temperature ◽

High Strength Steels ◽

High Strength ◽

Hole Expansion ◽

Aging Phenomena ◽

Temperature Strain

Download Full-text

Nano Scale Creep and the Role of Defects

MRS Proceedings ◽

10.1557/proc-436-201 ◽

1996 ◽

Vol 436 ◽

Cited By ~ 14

Author(s):

S. A. Syed Asif ◽

J. B. Pethica

Keyword(s):

Room Temperature ◽

Contact Stiffness ◽

Surface Films ◽

Force Method ◽

Before And After ◽

Long Time ◽

Reverse Creep ◽

Temperature Strain ◽

Accurate Observation

AbstractThe modulating force method in nanoindentation gives a direct measure of contact stiffness, and being insensitive to drift, allows the accurate observation of creep in small indents to be carried out over long time periods. We present results for a range of metals at room temperature. Strain rate indices similar to those for macroscopic creep are found. Reverse creep occurs for step unloading greater than about half the starting load. For electropolished tungsten, we find quite different behaviour before and after the sudden pop-in. Afterwards, creep is as in other metals, but beforehand, it is essentially zero. The slight changes of stiffness observed at the very smallest loads are due to diffusion of adsorbed surface films into the contact zone. Our results show that the dislocations nucleated and multiplied at pop-in provide the mechanism of creep.

Download Full-text

Room-Temperature, Strain-Tunable Orientation of Magnetization in a Hybrid Ferromagnetic Co Nanorod-Liquid Crystalline Elastomer Nanocomposite

Angewandte Chemie International Edition ◽

10.1002/anie.201504320 ◽

2015 ◽

Vol 54 (37) ◽

pp. 10811-10815 ◽

Cited By ~ 3

Author(s):

Ophélie Riou ◽

Barbara Lonetti ◽

Reasmey P. Tan ◽

Justine Harmel ◽

Katerina Soulantica ◽

...

Keyword(s):

Liquid Crystalline ◽

Room Temperature ◽

Temperature Strain

Download Full-text

Room-Temperature, Strain-Tunable Orientation of Magnetization in a Hybrid Ferromagnetic Co Nanorod-Liquid Crystalline Elastomer Nanocomposite

Angewandte Chemie ◽

10.1002/ange.201504320 ◽

2015 ◽

Vol 127 (37) ◽

pp. 10961-10965 ◽

Cited By ~ 3

Author(s):

Ophélie Riou ◽

Barbara Lonetti ◽

Reasmey P. Tan ◽

Justine Harmel ◽

Katerina Soulantica ◽

...

Keyword(s):

Liquid Crystalline ◽

Room Temperature ◽

Temperature Strain

Download Full-text

The influence of plastic deformation and chemical environment on the resistively of al-alloy overhead lines

Serbian Journal of Electrical Engineering ◽

10.2298/sjee0501063n ◽

2005 ◽

Vol 2 (1) ◽

pp. 63-76

Author(s):

D. Nowak-Woźny ◽

W. Mielcarek ◽

K. Prociów ◽

L. Woźny ◽

J.B. Gajewski

Keyword(s):

Plastic Deformation ◽

Room Temperature ◽

Measurement Data ◽

Liquid Nitrogen Temperature ◽

Mechanical Relaxation ◽

Al Alloy ◽

X Ray Diffraction ◽

X Ray ◽

Overhead Lines ◽

Chemical Ageing

The electrical resistively and intensity of X-ray diffraction reflexes were determined for overhead line wires deformed plastically and immersed at different solutions. Immersing (chemical ageing) was performed by plastic deformation along the wire axis. During chemical ageing the samples were exposed to the action of the Cl-, SO4 2-, and SO3 2- ions. Resistively was measured at room temperature and at liquid nitrogen temperature. After the X-ray and resistively measurement data were compared, it was found that three processes could take place: the flow of ions through the boundary between a sample and environment; the mechanical relaxation of vacancies near a line of dislocations, and the ordering of microstructure. These effects can lead to the anisotropy of resistively.

Download Full-text