Characterization of fatigue-induced free volume changes in bulk metallic glass using positron annihilation spectroscopy Public Deposited

http://ir.library.oregonstate.edu/concern/defaults/p2676w13w

Article appears in Applied Physics Letters ( http://apl.aip.org/) and is copyrighted by American Institute of Physics ( http://www.aip.org/).

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  • Depth-profiled Doppler broadening spectroscopy of positron annihilation on the cyclic fatigue-induced fracture surfaces of three amorphous Zr₄₄Ti₁₁Ni₁₀Cu₁₀Be₂₅ metallic glass specimens reveals the presence of a 30–50 nm layer of increased free volume that is generated by the propagating fatigue crack tip. The presence and character of this fatigue transformation zone is independent of the initial amount of bulk free volume, which was varied by structural relaxation via annealing, and the voids generated in the zone by intense cyclic deformation are distinct from those typical of the bulk.
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  • Vallery, R. S., Liu, M., Gidley, D. W., Launey, M. E., & Kruzic, J. J. (2007). Characterization of fatigue-induced free volume changes in bulk metallic glass using positron annihilation spectroscopy [Electronic version]. Applied Physics Letters, 91(26).
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