Measurements of accurate specific heats of metallic glasses by differential scanning calorimetry (DSC)

Thermokinetic analysis of the multistep crystallization of a NANOPERM-type ribbon

“…3, the double role for the selection of the appropriate heat-treatment (e.g., T a = 833 K) is demonstrated. Namely, this heat-treatment completely reacted out the R0, R1 and R2 transformation steps, however, it did not start the R3 step; thus it permitted to discover both the Table 1 Nucleation-and-growth versus normal-grain-growth, long-range diffusion and structural relaxation kinetics: f(a) -differential kinetic equation according to [8,15], gðaÞ ¼ falling edge of R2 peak and the leading edge of R3 peak. As the result, five critical pre-annealing temperatures T a = 603, 673, 773, 833 and 873 K (always for 60 min) have been found in the case of Fe 76 Mo 8 Cu 1 B 15 ribbon.…”

“…Only the R3 transformation respects the NG kinetics (up to 60% of its conversion) decreasing its exponent n 3 from 2.5 to 1.5 by annealing. Any representative Suriñ ach plot cannot fit the structural relaxation being a non-linear phenomenon [15]. In the R1 step only a-Fe(Mo) with lattice parameter a = 0.2868 nm is formed (Fig.…”

Structural relaxation and glass transition behavior of novel (Ti33Zr33Hf33)50(Ni50Cu50)40Al10 alloy developed by equiatomic substitution

“…This transformation is called structural relaxation, and is manifested by a continuous change in all physical properties [1][2][3][4][5]. Many models have been developed to describe and explain the structural relaxation of amorphous alloys [6]. Among them the free volume model is the most widely used [7][8][9].…”