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Posted on: 3/14/2013 12:00:00 AM... TMS members Suveen Mathaudhu and Yuntian Zhu have developed a new technique for creating stronger magnesium alloys with potential structural applications in the automobile and aerospace industries.

In their study, the researchers were able to strengthen the material by introducing "nano-spaced stacking faults." These are essentially a series of parallel fault-lines in the crystalline structure of the alloy that isolate any defects in that structure. This increases the overall strength of the material by approximately 200 percent.

"This material is not as strong as steel, but it is so much lighter that its specific strength is actually much higher," said Mathaudhu, a co-author of a paper on the research and an adjunct assistant professor of materials science and engineering at North Carolina State University under the U.S. Army Research Office's Staff Research Program. "In theory, you could use twice as much of the magnesium alloy and still be half the weight of steel. This has real potential for replacing steel or other materials in some applications, particularly in the transportation industry, such as the framework or panels of vehicles."

The research team was able to introduce the nano-spaced stacking faults to the alloy using conventional "hot rolling" technology that is widely used by industry. "We selected an alloy of magnesium, gadolinium, yttrium, silver, and zirconium because we thought we could introduce the faults to that specific alloy using hot rolling," said Zhu, a professor of materials science and engineering at North Carolina State and co-author of the paper. "And we were proven right."

"Because we used existing technology, industry could adopt this technique quickly and without investing in new infrastructure," Mathaudhu said.

For More Information:

• Read "Ultrastrong Mg Alloy via Nano-Spaced Stacking Faults"

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