INFLUENCE OF MASS ON DISPLACEMENT THRESHOLD
Molecular dynamics simulations are performed to investigate the effect of mass on displacement threshold energy in Cr, Mo, Fe and W. For each interatomic potential, the mass of the atoms is varied among those metals for a total of 16 combinations. The average threshold energy over all crystal directions is calculated within the irreducible crystal directions using appropriate weighting factors. The weighting factors account for the different number of equivalent directions among the grid points and the different solid angle coverage of each grid point. The grid points are constructed with a Miller index increment of 1/24 for a total of 325 points. For each direction, 10 simulations each with a different primary-knock-on atom are performed. The results show that for each interatomic potential, the average threshold energy is insensitive to the mass; i.e., the values are the same within the standard error. In the future, the effect of mass on high-energy cascades for a given interatomic potential will be investigated.
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- Related Information: Fusion Reactor Materials Program Semiannual Progress Report for the Period Ending June 30, 2014, 56; DOE-ER-0313/56:209-212
- Oak Ridge National Laboratory, Oak Ridge, TN, United States(US).
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- Pacific Northwest National Laboratory (PNNL), Richland, WA (US)
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- United States