UMass Amherst and Georgia Tech researchers produce ultra strong, ductile high-entropy alloys via AM

August 8, 2022

August 8, 2022

Researchers from the University of Massachusetts (UMass) Amherst and the Georgia Institute of Technology, USA, have published a paper entitled ‘Strong yet ductile nanolamellar high-entropy alloys by additive manufacturing’ in the journal Nature. It is hoped that the resultant high-entropy alloys will lead to better-performing components within the aerospace, medicine, energy and transportation fields.

The research team from the Multiscale Materials and Manufacturing Laboratory combined high-entropy alloys with Laser Beam Powder Bed Fusion (PBF-LB) Additive Manufacturing to develop materials with a net-like microstructure, made of alternating layers: face-centred and body-centred cubi (FCC and BCC, respectively) nanolamellar structures embedded in microscale eutectic colonies with random orientations.

“This unusual microstructure’s atomic rearrangement gives rise to ultra-high-strength as well as enhanced ductility, which is uncommon, because usually strong materials tend to be brittle,” stated Wen Chen, assistant professor of mechanical engineering, UMass. ”We got almost triple the strength [compared to conventional metal casting] and not only didn’t lose ductility but actually increased it simultaneously. For many applications, a combination of strength and ductility is key. Our findings are original and exciting for materials science and engineering alike.”

Ting Zhu, professor of mechanical engineering, Georgia Tech, led the researchers’ computational modelling by developing dual-phase crystal plasticity models to gauge the roles of the FCC and BCC nanolamellae and how the combination enables higher strength and ductility than traditional high-entropy alloys.

Jie Ren, Chen’s PhD student and paper co-author, added, “The ability to produce strong and ductile HEAs means that these 3D printed materials are more robust in resisting applied deformation, which is important for lightweight structural design for enhanced mechanical efficiency and energy saving.”

The paper is available here.

August 8, 2022

In the latest issue of Metal AM magazine

Download PDF

Extensive AM industry news coverage, as well as the following exclusive deep-dive articles:

  • Metal powders in Additive Manufacturing: An exploration of sustainable production, usage and recycling
  • Inside Wayland Additive: How innovation in electron beam PBF is opening new markets for AM
  • An end-to-end production case study: Leveraging data-driven machine learning and autonomous process control in AM
  • Consolidation, competition, and the cost of certification: Insight from New York’s AM Strategies 2024
  • Scandium’s impact on the Additive Manufacturing of aluminium alloys
  • AM for medical implants: An analysis of the impact of powder reuse in Powder Bed Fusion

The world of metal AM to your inbox

Don't miss any new issue of Metal AM magazine, and get the latest industry news. Sign up to our twice weekly newsletter.

Sign up

Discover our magazine archive…

The free to access Metal Additive Manufacturing magazine archive offers unparalleled insight into the world of metal Additive Manufacturing from a commercial and technological perspective through:

  • Reports on visits to leading metal AM part manufacturers and industry suppliers
  • Articles on technology and application trends
  • Information on materials developments
  • Reviews of key technical presentations from the international conference circuit
  • International industry news

All past issues are available to download as free PDFs or view in your browser.

Browse the archive

Looking for AM machines, metal powders or part manufacturing services?

Discover suppliers of these and more in our comprehensive advertisers’ index and buyer’s guide, available in the back of Metal AM magazine.

  • AM machines
  • Process monitoring & calibration
  • Heat treatment & sintering
  • HIP systems & services
  • Pre- & post-processing technology
  • Powders, powder production and analysis
  • Part manufacturers
  • Consulting, training & market data
View online
Share via
Copy link
Powered by Social Snap