Radiation-induced effects on the mechanical properties of natural ZrSiO4: double cascade-overlap damage accumulation
Several different models are known to describe the structure-dependent radiation-induced damage accumulation process in materials (e.g. Gibbons Proc IEEE 60:1062–1096, 1972; Weber Nuc Instr Met Phys Res B 166–167:98–106, 2000). In the literature, two different models of damage accumulation due to α-decay events in natural ZrSiO4 (zircon) have been described. The direct impact damage accumulation model is based on amorphization occurring directly within the collision cascade. However, the double cascade-overlap damage accumulation model predicts that amorphization will only occur due to the overlap of disordered domains within the cascade. By analyzing the dose-dependent evolution of mechanical properties (i.e., Poisson’s ratios, compliance constants, elastic modulus, and hardness) as a measure of the increasing amorphization, we provide support for the double cascade-overlap damage accumulation model. We found no evidence to support the direct impact damage accumulation model. Additionally, the amount of radiation damage could be related to an anisotropic-to-isotropic transition of the Poisson’s ratio for stress along and perpendicular to the four-fold c-axis and of the related compliance constants of natural U- and Th-bearing zircon. The isotropification occurs in the dose range between 3.1 × and 6.3 × 1018 α-decays/g.
KeywordsZircon ZrSiO4 Radiation damage Mechanical properties Nanoindentation Damage accumulation
Financial support by the Deutsche Forschungsgemeinschaft DFG (BE 5456/2-1) is gratefully acknowledged (T.B.). R.C.E. gratefully acknowledges financial support by the US Department of Energy through the Energy Frontier Research Center “Materials Science of Actinides” under Award Number DE-SC0001089. The constructive comments and helpful suggestions of two anonymous reviewers are gratefully acknowledged.
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Conflict of interest
The authors declare that they have no conflict of interest.
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