1 Sub-T g relaxation times of the  process in metallic glasses Chaoren Liu a , Eloi Pineda b , Daniel Crespo a , Jichao Qiao c , Zach Evenson d , Beatrice Ruta e,f a Departament de Física, Universitat Politècnica Catalunya - BarcelonaTech, EETAC, Esteve Terradas 5, 08860 Castelldefels, Spain. eloi.pineda@upc.edu b Departament de Física, Universitat Politècnica Catalunya - BarcelonaTech, ESAB, Esteve Terradas 8, 08860 Castelldefels, Spain. chaorenliu@gmail.com / daniel.crespo@upc.edu c School of Mechanics, Civil Engineering and Architecture, Northwestern Polytechnical University, Xi’an 710072, P. R. China d Heinz Maier-Leibnitz Zentrum (MLZ) and Physik Department, Technische Universität München, Lichtenbergstrasse 1, 85748 Garching, Germany. e Institut Lumière Matière, UMR5306 Université Lyon 1- CNRS, Université de Lyon, 69622 Villeurbanne Cedex, France beatrice.ruta@univ-lyon1.fr f ESRF – The European Synchrotron, CS 40220, 38043 Grenoble Cedex 9, France. * Corresponding author: Eloi Pineda eloi.pineda@upc.edu Tel. (34) 935 521 141 Abstract The current view of structural relaxation in metallic glasses assumes the presence of primary and secondary processes with different activation energies. While the faster, secondary process can be well characterized in the out-of-equilibrium state below the glass transition temperature T g , the experimental direct determination of the primary process in this temperature region is more difficult due to the long relaxation times. In this work, we merge new and literature data to analyze the temperature behavior of the primary relaxation *Manuscript Click here to view linked References