Usual stress relaxation in an ‘unusual’ Pd40Cu40P20 metallic glass

Unexpectedly large relaxation time determined by in situ high-frequency shear modulus measurements near the glass transition of bulk glassy Pd40Cu30Ni10P20

“…Nevertheless, recent stress relaxation measurements on glassy Pd 40 Cu 30 Ni 10 P 20 and Pd 40 Cu 40 P 20 upon heating at 5 K/min through the glass transition showed that at around T g the glass still sustains up to 30-40% of initially applied stress [18,19]. In the view of the fact that τ m ≈ 30 s at T ≈ T g (Fig.…”

Comparative study of relaxation behavior of glassy “usual” Pd40Cu30Ni10P20 and “unusual” Pd40Cu40P20 by measurements of the electrical resistance

“…The glass transition and crystallization onset temperatures were found by DSC (at 5 K/min) to be 530 K and 560 K for Pd 40 Cu 40 P 20 [13], 559 K and 637 K for Pd 40 Cu 30 Ni 10 P 20 [6], respectively. The density of ribbon Pd 40 Cu 40 P 20 was determined to be 9:168 AE 0:016g=cm 3 while its density after crystallization at 773 K is by z1% smaller, 9:074 AE 0:017g=cm 3 [13]. The details of measurements of the electrical resistance are given elsewhere [10].…”

“…The ribbons were verified to be fully amorphous by a synchrotron radiation facility at Kurchatov Institute in Moscow in the transmission mode at l ¼ 0:5668Ǻ. The glass transition and crystallization onset temperatures were found by DSC (at 5 K/min) to be 530 K and 560 K for Pd 40 Cu 40 P 20 [13], 559 K and 637 K for Pd 40 Cu 30 Ni 10 P 20 [6], respectively. The density of ribbon Pd 40 Cu 40 P 20 was determined to be 9:168 AE 0:016g=cm 3 while its density after crystallization at 773 K is by z1% smaller, 9:074 AE 0:017g=cm 3 [13].…”

“…without a change of the local chemical composition) and its density is bigger than that of the reference crystalline Pd 2 Cu 2 P tetragonal phase [11]. Meanwhile, it was found that the shear viscosity of glassy Pd 40 Cu 40 P 20 is even lower compared to that of Pd 40 Cu 30 Ni 10 P 20 [12] and the stress relaxation behavior of this glass is fairly similar to that of usual MGs [13]. It is therefore interesting to compare the relaxation behavior of these two glasses by monitoring the R -changes occurring upon heat treatment and determine whether the resistance and density changes are correlated.…”

Structural relaxation of an “unusual” Pd40Cu40P20 metallic glass studied by measurements of the electrical resistance

“…It was earlier found that, in spite of bigger density, the shear modulus of Pd 40 Cu 40 P 20 glass is by 13-36% lower than the four independent shear moduli of the reference crystal [6], like in "usual" MGs. Creep and stress relaxation measurements showed that the SRinduced viscous flow of glassy Pd 40 Cu 40 P 20 is quite similar to that of Pd 40 Cu 30 Ni 10 P 20 glass [7,8], which has the opposite (i.e. "usual") relation between the densities of amorphous and crystalline states.…”