Effects of passing electric current on structural relaxation, crystallization and elastic property in amorphous Cu{sub 50}Ti{sub 50}
- Univ. of Tsukuba, Ibaraki (Japan). Inst. of Materials Science
For amorphous Cu{sub 50}Ti{sub 50}, the authors investigated the effects of passing electric d.c.-current (PEC) other than joule heating on Young`s modulus M below 300 K, the structural relaxation (SR) at {approximately}500 K and the crystallization at {approximately}650 K for the current density i{sub d} below 5 {times} 10{sup 3} A/cm{sup 2}. Under PEC, M shows an increase with increasing i{sub d}, which is reversible for changing i{sub d} and shows no temperature dependence. All the features of the effects of PEC on M are very similar to those reported for the effects of applied strain {var_epsilon}{sub t} on M, when the effects of PEC are assumed to be identical to those of {var_epsilon}{sub t}. On the basis of the scaling found between i{sub d} and {var_epsilon}{sub t}, the authors estimated the apparent effective charge a-Z*e (e = the elementary charge) measuring the electromigration force as 7 {times} 10{sup 4}e, which is the order of 10{sup 4} times larger than the values reported in crystalline metals and alloys. SR is accelerated under PEC for i{sub d} > 2.5 {times} 10{sup 3} A/cm{sup 2}, where the pre-exponential frequency-factor {nu}{sub SR.O} and the activation energy E{sub SR} show a strong increase and a small increase, respectively. For the crystallization, its early stage is accelerated under PEC when the crystallization proceeds rapidly at higher temperatures. This is found to reflect the acceleration of the homogeneous nucleation under PEC. These features found for the effects of PEC are very similar to those reported for various a-alloys, suggesting that they reflect the common characteristics in a-alloys.
- OSTI ID:
- 39851
- Journal Information:
- Acta Metallurgica et Materialia, Journal Name: Acta Metallurgica et Materialia Journal Issue: 4 Vol. 43; ISSN 0956-7151; ISSN AMATEB
- Country of Publication:
- United States
- Language:
- English
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