Effects of annealing and hydrogen charging on the elastic property and the specific volume of amorphous Cu[sub 50]Zr[sub 50]
- Univ. of Tsukuba, Ibaraki (Japan). Inst. of Materials Science
The authors investigated the elastic property of amorphous Cu[sub 50]Zr[sub 50] for the strain amplitude, [epsilon][sub t], below 4 [times] 10[sup [minus]3] using the vibrating reed technique and the effects of annealing and H charging on the specimen length, L. The constituent nonlinear inelastic strain, [epsilon][sub i], increases, showing saturation with increasing [epsilon][sub t] below about 3.5 [times] 10[sup [minus]3] (=[epsilon][sub A], hereafter), where the saturation value of [epsilon][sub i], [epsilon][sub i,t], is found to be 0.11 [epsilon][sub A]. The [epsilon][sub t] dependence of d[epsilon][sub i]/d[epsilon][sub t] can well be explained by two constituent Gaussian functions centered at [epsilon][sub t] = 0. These features remain unchanged for various temperatures below 410 K, suggesting that the atomic process responsible for [epsilon][sub i] is an athermal process. Annealing for the structural relaxation causes a strong decrease in [epsilon][sub i,t] by about 50% and a slight decrease in L, ([Delta]L/L)[sub SR], by 0.08%. Annealing for the crystallization causes a strong decrease in L, ([Delta]L/L)[sub x], by 0.7%, where the specimens become brittle. H charging causes a strong increase in [epsilon][sub i,t] but the increased [epsilon][sub i,t] is canceled for the H concentration, C[sub H], beyond 12 at.%. In contrast, L shows a monotonous increase for C[sub H] below 25at.%. They surmise that [epsilon][sub i] is associated with the reversible localized shear deformation of the deformable units which contain a large free volume and isolatedly distribute in the amorphous structure, and that the C[sub H] dependence of [epsilon][sub i,t] reflects a change in the number density of the deformable units due to H-charging. The present results are discussed by referring to the previous computer simulations and tensile tests reported for amorphous alloys.
- OSTI ID:
- 7029356
- Journal Information:
- Acta Metallurgica et Materialia; (United States), Vol. 42:6; ISSN 0956-7151
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
COPPER ALLOYS
ELASTICITY
ZIRCONIUM ALLOYS
AMORPHOUS STATE
ANNEALING
BINARY ALLOY SYSTEMS
DATA
GAUSS FUNCTION
HYDROGEN EMBRITTLEMENT
ALLOY SYSTEMS
ALLOYS
EMBRITTLEMENT
FUNCTIONS
HEAT TREATMENTS
INFORMATION
MECHANICAL PROPERTIES
TENSILE PROPERTIES
360103* - Metals & Alloys- Mechanical Properties