Mechanically induced excess enthalpy in inorganic glasses

Martin, Birgit; Wondraczek, Lothar; Deubener, Joachim; Yue, Yuanzheng
March 2005
Applied Physics Letters;3/21/2005, Vol. 86 Issue 12, p121917
Academic Journal
We show the effect of mechanical quenching on the thermodynamic state of an inorganic glass, i.e., calcium metaphosphate glass, measured using differential scanning calorimetry (DSC). The calcium metaphosphate glasses were isothermally stretched at a given stress; and then cooled slowly. Afterwards the glasses are subject to two runs of DSC scans. We observed a pronounced sub-Tg exotherm on the first up scan, which is due to the release of the mechanically induced excess enthalpy. The exotherm increases with increasing tensile stress.


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