Effects of annealing and hydrogen charging on the elastic property and the specific volume of amorphous Cu[sub 50]Zr[sub 50]

Journal Article · Wed Jun 01 00:00:00 EDT 1994 · Acta Metallurgica et Materialia; (United States)

DOI:https://doi.org/10.1016/0956-7151(94)90035-3· OSTI ID:7029356

Mizubayashi, H; Kaida, M; Otsuka, S; Okuda, S ^[1]

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1. 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), Journal Name: Acta Metallurgica et Materialia; (United States) Vol. 42:6; ISSN 0956-7151; ISSN AMATEB
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360103* -- Metals & Alloys-- Mechanical Properties
ALLOY SYSTEMS
ALLOYS
AMORPHOUS STATE
ANNEALING
BINARY ALLOY SYSTEMS
COPPER ALLOYS
DATA
ELASTICITY
EMBRITTLEMENT
FUNCTIONS
GAUSS FUNCTION
HEAT TREATMENTS
HYDROGEN EMBRITTLEMENT
INFORMATION
MECHANICAL PROPERTIES
TENSILE PROPERTIES
ZIRCONIUM ALLOYS