Researchers have finally found a way to make ceramics flex instead of shatter, using a smart metal composite made with advanced 3D printing.
Researchers in the US have developed a novel 3D-printed smart composite that enables brittle ceramics to bend, absorb energy, and withstand heavy mechanical loads, while being manufactured at full industrial scale.
The innovation addresses one of the toughest problems in materials science by enabling shape-memory ceramics to scale without cracking. It could potentially change how engineers design structures exposed to stress, vibration, and impact.The research was led by Hang Yu, PhD, an associate professor of materials science and engineering at the Virginia Polytechnic Institute and State University , who has been pursuing a solution for the problem since his postdoctoral days at MIT. Now, in collaboration with Donnie Erb, a PhD student, and Nikhil Gotawala, PhD, a postdoctoral researcher at the university, Yu showed a way to embed functional ceramic particles directly into metal using a solid-state manufacturing process.Rethinking ceramicsShape-memory ceramics have long fascinated scientists, as they can change their internal structure under stress or heat and return to their original form. They can also move or absorb energy, without gears or moving parts, like nickel-titanium alloys used in medical devices.However, until now, shape-memory ceramics have only worked at the microscopic scale, as attempts to produce them in bulk have typically led to fracture. To overcome this, the team embedded tiny shape-memory ceramic particles into metal.They used a process called additive friction stir deposition , which fuses materials below their melting point by spinning them together under intense pressure. This resulted in a strong, defect-free composite in which the ceramics can phase-shift under stress to dissipate energy.Hang Yu, PhD, associate professor , poses with members of his lab.Credit: Hang YuUnlike normally brittle ceramics, the material can also be 3D-printed in bulk with full density in the as-printed state. According to the team, it opens up possibilities for applications in defense, infrastructure, aerospace, and even high-performance sporting equipment.Yu reported that the composite can withstand tension, bending, and compression while absorbing energy through a stress-induced martensitic transformation. “In that sense, it’s multifunctional,” he added. “That allows us to move toward making big things with the potential for real applications.”From lab to scale“For the first time, this research creates bulk shape-memory ceramic–metal matrix composites using a scalable, solid-state 3D-printing process,” Yu pointed out in a press release.The team believes that the breakthrough could be applied across a wide range of fields. This includes vibration damping and impact absorption in defense systems, aerospace, infrastructure, and sporting goods.A ceramics-embedded metal could be used in the shaft of a golf club to reduce vibration while maintaining a light weight. “With this composite, you’re adding functionality to a metal that already works for a certain application,” Erb said.The research underscores Virginia Tech’s strength in advanced manufacturing. Yu has been exploring applications of additive friction-stir deposition, with support from the National Science Foundation and the US Army Research Laboratory.“This composite is so interesting, and this shape-memory function of ceramics is something I have been working on since I was a postdoc,” Yu concluded. “Now I can merge both these interests and make some new key applications, and that’s very exciting.”The study has been published in the journal Materials Science and Engineering: R: Reports.
Ceramic 3D Printing Energy Innovation Inventions And Machines Materials Materials Science Physics Smart Composite Virginia Tech
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