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X-ray photon correlation spectroscopy revealing the change of relaxation dynamics of a severely deformed Pd-based bulk metallic glass

H. Zhou, S. Hilke, E. Pineda, M. Peterlechner, Y. Chushkin, S. Shanmugam, G. Wilde

Acta Materialia, 195, 446-453, (2020)

DOI: 10.1016/j.actamat.2020.05.064

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The influence of severe plastic deformation on the relaxation dynamics of a Pd40Ni40P20 (at.%) bulk metallic glass was investigated on the atomic length scale by X-ray photon correlation spectroscopy and fluctuation electron microscopy. At a series of isothermal temperatures adjusted by step heating below the glass transition, the relaxation times were obtained by X-ray photon correlation spectroscopy and the corresponding activation energies were evaluated. It was found that the relaxation dynamics was accelerated by about a half order of magnitude after plastic deformation by high-pressure torsion processing, which indicates that effective rejuvenation has occurred. At relatively low temperatures the relaxation process was stress-dominated and deformation could improve the atomic mobility without changing the energy barrier. At higher temperatures, a second regime of relaxation times occurred. It is concluded that with increasing temperature, a crossover from a stress-dominated to a diffusion-dominated relaxation process occurs. Moreover, the medium range order was measured using variable resolution fluctuation electron microscopy indicating that deformation-induced changes in topology are responsible for the rejuvenation and the accelerated dynamics.

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{"type":"article", "name":"h.zhou20208", "author":"H. Zhou and S. Hilke and E. Pineda and M. Peterlechner and Y. Chushkin and S. Shanmugam and G. Wilde", "title":"Xray photon correlation spectroscopy revealing the change of relaxation dynamics of a severely deformed Pdbased bulk metallic glass", "journal":"Acta Materialia", "volume":"195", "OPTnumber":"", "OPTmonth":"8", "year":"2020", "OPTpages":"446-453", "OPTnote":"", "OPTkey":"bulk metallic glass; high-pressure torsion; X-ray photon correlation spectroscopy; relaxation dynamics; fluctuation electron microscopy Medium range order", "DOI":"10.1016/j.actamat.2020.05.064"}
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