Effect of stacking fault energy on mechanism of plastic deformation in nanotwinned FCC metals
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Ames National Laboratory is a government-owned, contractor-operated national laboratory of the U.S. Department of Energy (DOE), operated by and located on the campus of Iowa State University in Ames, Iowa.
For more than 70 years, the Ames National Laboratory has successfully partnered with Iowa State University, and is unique among the 17 DOE laboratories in that it is physically located on the campus of a major research university. Many of the scientists and administrators at the Laboratory also hold faculty positions at the University and the Laboratory has access to both undergraduate and graduate student talent.
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Abstract
Starting from a semi-empirical potential designed for Cu, we have developed a series of potentials that provide essentially constant values of all significant (calculated) materials properties except for the intrinsic stacking fault energy, which varies over a range that encompasses the lowest and highest values observed in nature. These potentials were employed in molecular dynamics (MD) simulations to investigate how stacking fault energy affects the mechanical behavior of nanotwinned face-centered cubic (FCC) materials. The results indicate that properties such as yield strength and microstructural stability do not vary systematically with stacking fault energy, but rather fall into two distinct regimes corresponding to ‘low’ and ‘high’ stacking fault energies.
Comments
This article is published as Borovikov, Valery, Mikhail I. Mendelev, Alexander H. King, and Richard LeSar. "Effect of stacking fault energy on mechanism of plastic deformation in nanotwinned FCC metals." Modelling and Simulation in Materials Science and Engineering 23, no. 5 (2015): 055003. 10.1088/0965-0393/23/5/055003. Posted with permission.