Pressure dependence of the melting temperature of metals

New Challenges for the Pressure Evolution of the Glass Temperature

“…However, the fluidity can be also preserved below melting, down to the glass temperature T g ≪ T m , where the solidification from the metastable ultraviscous/ultraslowing liquid to the solid amorphous glass state occurs (Donth, 2000;Rzoska et al, 2010;Berthier and Ediger, 2016). There are also numerous semi-crystalline systems where the vitrification is related to the solidification of one or few elements of symmetry: as examples can serve orientationally disordered crystals (plastic crystals) (Drozd-Rzoska et al, 2006a,b) or liquid crystals (Drozd-Rzoska, 2006, 2009.…”

“…Turnbull (Turnbull, 1969;Angell, 2008) formulated the broadly used empirical Glass-Forming Ability (GFA) rule distinguishing poor (T g /T m < 2/3) and good glass formers (T g /T m > 2/3) and linking T g and T m . Notwithstanding, there is a notable difference between melting and vitrification: melting is related to the "sudden and almost non-signaled" fusion on cooling whereas the glass transition is hallmarked by far previtreous super-Arrhenius (SA) changes of viscosity η(T), primary relaxation time τ(T), or other related dynamic properties (Avramov and Milchev, 1988;Donth, 2000;Rzoska et al, 2010;Berthier and Ediger, 2016). This opens the possibility of estimating the glass temperature from the analysis of previtreous effects well above T g : as the general reference values η(T g ) = 10…”

“…For many systems, passing T m without crystallization is associated with an extreme temperature quench (Donth, 2000). However, there are also numerous glass formers where entering the metastable ultraviscous/ultraslowing domain is possible at any practical experimental cooling rate (Donth, 2000;Rzoska et al, 2010;Berthier and Ediger, 2016). Turnbull (Turnbull, 1969;Angell, 2008) formulated the broadly used empirical Glass-Forming Ability (GFA) rule distinguishing poor (T g /T m < 2/3) and good glass formers (T g /T m > 2/3) and linking T g and T m .…”

“…13 Poise for viscosity or τ(T g ) = 100 s for the primary (alpha, structural) relaxation time are assumed, since they correlate with the thermodynamic estimation (heat capacity or density scan) of T g related to 10 K/min cooling rate (Donth, 2000;Rzoska et al, 2010). Although the ultimate form of τ(T,P) or η(T, P) portrayal in previtreous ultraviscous/ultraslowing liquids on approaching T g remains puzzling (MartinezGarcia et al, 2013(MartinezGarcia et al, , 2014(MartinezGarcia et al, , 2015, most often the Vogel-Fulcher-Tammann (VFT) relation is used (Tammann, 1903;Vogel, 1921;Fulcher, 1925;Donth, 2000;Rzoska et al, 2010;Martinez-Garcia et al, 2013;Berthier and Ediger, 2016):…”

Microstructural Characterization of Intermediate Layer Produced at Aluminum/Metallic Glass Interface Fabricated by Magnetic Pulse Welding

“…The melting point of the aluminum increases up to 988 K at the pressure of 1 GPa. 28) It is higher than the maximum temperature generated at the welding interface (430 K 26) ). For the metallic glasses, glass transition temperature (T g : 690 K (Zr 48 Cu 36 Al 8 Ag 8 ), 29) 701 K (Cu 50 Zr 42.5 Al 7.5 ) 27) ) is also higher than the maximum temperature generated at the welding interface (430 K 26) ).…”