generaly what are the usage of the DSC diagram of isochornal annealing of an metallic glass alloy before and after the microalloying?
for example increasing Tg and Tx?or incresace in width of the peak and...?
The glass transition temperature is to be avoided so that you can maintain the amorphous structure. You can use data from the DSC measurements to determine changes to Tg as a result of micro-alloying and thereby determine the range of temperatures over which the metallic glass might be stable. The width of the DSC peaks can also give you an indication of the stability of the amorphous phase. The wider peaks indicate a larger range of temperatures over which recrystallizaton may occur.
The main usages are: 1.Relieve residual internal stresses introduced during manufacture. 2. Increases the strength and reliability of the product (Durability)3. An increase in the potential energy, a decrease in the density, and a change in the local structure as well as mechanical softening were observed.Moreover Two parameters, one related to the annealing temperature, Ta/Tg, and the other related to the cooling rate during the recovery annealing process, Vc/Vi, were proposed.Thermal history of
metallic glasses is reset above 1.2Tg,accompanied by a change in the local structure, it is essential that the condition of Ta/Tg ≥ 1.2 is satisfied during annealing. The glassy structure transforms into a more disordered state with the decomposition of icosahedral short-range order within this temperature range. Therefore, a new glassy structure depending on the subsequent quenching rate is generated.
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