Scientists manage to improve metallic glasses

Scientists from NUST MISIS manage to improve metallic glasses
Metallic glass sample. Credit: NUST MISIS

Researchers at National University of Science and Technology MISIS (NUST MISIS) have managed to develop a unique method to process bulk metallic glasses. According to the authors of the study, they have managed to find processing conditions that significantly improve the quality of this promising material. The research results were published in Journal of Alloys and Compounds.

Metallic glasses (amorphous metals) are materials which, unlike crystalline forms, don’t have a long range atomic order. According to the scientists, this makes the material high-strength, elastic, and corrosion resistant. Amorphous metals also have other useful properties, due to which they are in demand in instrument making, mechanical engineering, medicine and magneto-electrical engineering.

NUST MISIS scientists explained that the material’s brittleness is one of the obstacles to its widespread use. The authors of the study believe that the new method to process metallic glasses will help eliminating this problem. The method was tested on an amorphous Zr-Cu-Fe-Al system alloy.

“Annealing before and after rolling was ‘prohibited’ by the canons of the science of metallic glasses, since this leads to their embrittlement in the absolute majority of cases. The choice of the alloy composition and alloying system helped us bypass this problem: annealing at about 100 degrees below the glass-transition temperature allowed to achieve ductilization of bulk samples and hardening of tape samples without embrittlement,” Professor Dmitry Luzgin, the research supervisor, explained.

According to the scientists, it is the way the original amorphous matrix of the alloy decomposes that affects the resulting material’s characteristics. Different results are achieved depending on the samples’ geometry, bulk or tape.

“For bulk samples, we’ve achieved an increase in tensile plasticity of up to 1.5% at room temperature by dividing a homogeneous amorphous phase into two. For ribbon samples, a 25% increase in hardness has been achieved, which is provided with the separation of secondary-amorphous-phase glassy nanoparticles of about 7 nm with retention of plasticity on bending and compression. This is an unexpected and rather significant result,” Andrey Bazlov, the author of the method, an employee at the Department of Physical Metallurgy of Non-ferrous Metals of NUST MISIS, said.

NUST MISIS scientists explained that the Zr-Cu-Fe-Al system alloy cannot be used as the main structural material due to its high cost; but they believe that the proposed technology can be applied to other amorphous alloys, in particular, titanium.

The new method will simplify the process of imparting the necessary properties to metallic glasses, thereby expanding their scope of application. In the future, the research team wants to use the new technology to produce titanium and other high-quality bulk metallic glasses.

Scientists develop low-cost energy-efficient materials

More information:
A.I. Bazlov et al, Thermo-mechanical processing of a Zr62.5Cu22.5Fe5Al10 glassy alloy as a way to obtain tensile ductility, Journal of Alloys and Compounds (2020). DOI: 10.1016/j.jallcom.2020.157138

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Scientists manage to improve metallic glasses (2020, October 23)
retrieved 23 October 2020

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Ohana One International Surgical Aid and Education Launches Virtual Surgical Sight Smart Glasses Program with Vuzix

ROCHESTER, N.Y., Oct. 22, 2020 /PRNewswire/ — Vuzix® Corporation (NASDAQ: VUZI), (“Vuzix” or, the “Company”), a leading supplier of Smart Glasses and Augmented Reality (AR) technology and products, in collaboration with Ohana One, a global surgical training nonprofit organization whose mission is to cultivate high-quality surgical and anesthesia programs in developing areas around the world today, announced the first collaborative study of mentor-mentee training through their Surgical Sight program to the non-governmental organization (NGO) community.  

Ohana One International Surgical Aid and Education Launches Virtual Surgical Sight Smart Glasses Program with Vuzix

The Surgical Sight program utilizes Vuzix Smart Glasses to connect surgical mentors in developed areas with surgeons around the globe to create training relationships within surgery. The surgical mentee can share his or her surgical field directly with the mentor, and the mentor sees what the mentee is seeing live in real-time using specialized smart glasses software. This technology can take pictures of the live feed, record videos, freeze the image and subsequently write on top of the captured image, and allow a mentor’s hands to point out areas that need special attention or direction, all as if the mentor was directly operating with the mentee in live time. In doing so, this creates a relationship between the mentor and mentee for training purposes, allowing the mentee to further develop their surgical skills. The smart glasses and software create an environment where the mentor can be available in live time during the surgery, preoperative planning, and post-operative monitoring.

Early supporters of Ohana One’s focus on global surgical education include actress Charlize Theron, actress Jessica Chastain, American filmmaker Jay Roach and American rapper Quavo.

The Surgical Sight program is the brainchild of Ohana One International Surgical Aid and Education, along with Ohana One cofounder and VP Dr. David Kulber, a renowned hand and reconstructive surgeon at Cedars-Sinai Medical Center in Los Angeles. Over the last 10 years, Dr. Kulber has mentored Dr. Pedro Santos, who is one of only three plastic surgeons in all of Mozambique, a country in Africa of over 30 million people. He has been doing so through annual surgical mission trips, and now most recently working closely together year-round utilizing Vuzix Smart Glasses technology.  During the initial missions, it was immediately recognized that unless there was year-round training for the surgeon, annual missions were not enough to continue working on the surgeon’s skills, as this type of work requires much more frequent mentorship. Thus, the idea of utilizing smart glasses technology for remote surgical training began. This technology allowed Dr. Kulber to continue to train Dr. Santos throughout the year, a key factor in further developing Dr. Santos’ skill as a plastic surgeon. This unique training is critical, as surgeons in remote areas of the world struggle without having mentorships to assist in training.

“The success of the first mentor/mentee program culminated with Dr. Santos passing his COSECSA boards for the first time while ranking second in all of Africa, and having other doctors wanting to volunteer,” states Dr. Kulber. “This experience created

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