Nav: Home

A new rare metals alloy can change shape in the magnetic field

July 08, 2019

Scientists from Peter the Great St.Petersburg Polytechnic University (SPbPU) with their colleagues developed multifunctional metal alloys that emit and absorb heat at the same time and change their size and volume under the influence of a magnetic field. This effect is caused by changes in the structure of the substance. The alloys may be used in medicine and industry. The results of the study were published in the Key Engineering Materials journal. The project was supported by the Russian Foundation For Basic Research and carried out as a part of the state assignments of the Federal Agency for Scientific Organizations and the Ministry of Education and Science of the Russian Federation.

When magnetized, certain bodies change their volume and linear dimensions. This phenomenon is called magnetostriction. The shape changes depend both on the properties of the magnetic field and on the substance structure. The biggest changes usually occur in strongly magnetic materials such as nickel, iron, and cobalt oxide alloys. However, the magnetic properties of rare metals require additional studies and are of great interest today.

A team of scientists from Peter the Great St. Petersburg Polytechnic University calculated the combination of components in an alloy that would allow for heat absorption and emission and shape and size changes within a wide variety of temperatures including those close to human body temperature. In such an alloy terbium, dysprosium, gadolinium, and cobalt should be combined as 0.2:0.8-x:x:2, and aluminium should be added to them to reach the ratio of 0.2:0.8-x:x:0.9:0.1 (where x is a variable). The alloys were manufactured in the Institute of Electrical Engineering at Leibniz University Hannover.

The obtained material may be used to develop magnetostrictive transducers. They serve as sensors, filters, and resonators that transform the magnetic field into mechanical oscillations and vice versa. This is an important function for various devices, such as material integrity controllers that help find air bubbles within constructions. If such bubbles are not identified and removed, they may cause cracks and damage. Moreover, a transducer can serve as a basis for developing sensitive vibration gauges used to register earthquake shocks, as well as a source and a receiver of sound waves for underwater works.

A team of specialists from the Institute of Metallurgy and Material Science of the Russian Academy of Sciences studied the effect of the magnetic field on the alloy. The surface of the substance was probed with a thin needle able to detect every indent or mount. The system worked a lot like a phonograph, but the data was transformed not in music, but in an image. The scientists demonstrated that the surface of the alloy is covered in stripes and that their layout changes under the influence of the magnetic field. Thus, they were able to see the restructuring of the metal that explains the magnetostriction effect.

"Transducers based on our alloys are going to be more durable and long-lasting than the existing analogs and will work in a wide range of magnetic fields. Moreover, the alloys may be used in medicine as they can change their shape under the influence of magnetic fields that are safe for human health. For example, one can develop arterial stents that would flow in the bloodstream in a compact form and then unfold in a given place. This is possible because the operating temperature range of our materials is close to human body temperature," said Alexey Filimonov, the head of the Department of Physical Electronics at Peter the Great St. Petersburg Polytechnic University (SPbPU).
-end-


Peter the Great Saint-Petersburg Polytechnic University

Related Magnetic Field Articles:

Earth's last magnetic field reversal took far longer than once thought
Every several hundred thousand years or so, Earth's magnetic field dramatically shifts and reverses its polarity.
A new rare metals alloy can change shape in the magnetic field
Scientists developed multifunctional metal alloys that emit and absorb heat at the same time and change their size and volume under the influence of a magnetic field.
Physicists studied the influence of magnetic field on thin film structures
A team of scientists from Immanuel Kant Baltic Federal University together with their colleagues from Russia, Japan, and Australia studied the influence of inhomogeneity of magnetic field applied during the fabrication process of thin-film structures made from nickel-iron and iridium-manganese alloys, on their properties.
'Magnetic topological insulator' makes its own magnetic field
A team of U.S. and Korean physicists has found the first evidence of a two-dimensional material that can become a magnetic topological insulator even when it is not placed in a magnetic field.
Scientists develop a new way to remotely measure Earth's magnetic field
By zapping a layer of meteor residue in the atmosphere with ground-based lasers, scientists in the US, Canada and Europe get a new view of Earth's magnetic field.
Magnetic field milestone
Physicists from the Institute for Solid State Physics at the University of Tokyo have generated the strongest controllable magnetic field ever produced.
New world record magnetic field
Scientists at the University of Tokyo have recorded the largest magnetic field ever generated indoors -- a whopping 1,200 tesla, as measured in the standard units of magnetic field strength.
Researchers discover link between magnetic field strength and temperature
Researchers recently discovered that the strength of the magnetic field required to elicit a particular quantum mechanical process corresponds to the temperature of the material.
Astronomers observe the magnetic field of the remains of supernova 1987A
For the first time, astronomers have directly observed the magnetism in one of astronomy's most studied objects: the remains of Supernova 1987A (SN 1987A), a dying star that appeared in our skies over thirty years ago.
Watch: Insects also migrate using the Earth's magnetic field
A major international study led by researchers from Lund University in Sweden has proven for the first time that certain nocturnally migrating insects can explore and navigate using the Earth's magnetic field.
More Magnetic Field News and Magnetic Field Current Events

Top Science Podcasts

We have hand picked the top science podcasts of 2019.
Now Playing: TED Radio Hour

Risk
Why do we revere risk-takers, even when their actions terrify us? Why are some better at taking risks than others? This hour, TED speakers explore the alluring, dangerous, and calculated sides of risk. Guests include professional rock climber Alex Honnold, economist Mariana Mazzucato, psychology researcher Kashfia Rahman, structural engineer and bridge designer Ian Firth, and risk intelligence expert Dylan Evans.
Now Playing: Science for the People

#540 Specialize? Or Generalize?
Ever been called a "jack of all trades, master of none"? The world loves to elevate specialists, people who drill deep into a single topic. Those people are great. But there's a place for generalists too, argues David Epstein. Jacks of all trades are often more successful than specialists. And he's got science to back it up. We talk with Epstein about his latest book, "Range: Why Generalists Triumph in a Specialized World".
Now Playing: Radiolab

Dolly Parton's America: Neon Moss
Today on Radiolab, we're bringing you the fourth episode of Jad's special series, Dolly Parton's America. In this episode, Jad goes back up the mountain to visit Dolly's actual Tennessee mountain home, where she tells stories about her first trips out of the holler. Back on the mountaintop, standing under the rain by the Little Pigeon River, the trip triggers memories of Jad's first visit to his father's childhood home, and opens the gateway to dizzying stories of music and migration. Support Radiolab today at Radiolab.org/donate.