Comparative study of Sc and Er addition on microstructure, mechanical properties, and electrical conductivity of Al-0.2Zr-based alloy cables
- School of Material Science and Engineering, Central South University, Changsha 410083 (China)
- School of Mechanical Engineering, South China University of Technology, Guangzhou 510000 (China)
Highlights: • The comprehensive properties of Al-0.2Zr-0.1Sc were better than those of Al-0.2Zr-0.1Er alloy cable. • The microstructures evolved from fibrous grains to equiaxed grains with increasing annealing time. • The Zener drag force increased with increasing ratio of volume fraction (F{sub V}) to average diameter F{sub V}/ d-bar . • The capability to inhibit recrystallization was as follows: Al{sub 3}(Zr, Sc) > Al{sub 3}(Zr, Er) > Al{sub 3}Zr. - Abstract: The effect of the addition of 0.1 wt% Sc and 0.1 wt% Er on the deformation microstructure, Vickers microhardness, and electrical conductivity of Al-0.2 wt% Zr-based alloy cables annealed at 400 °C for different times was investigated. The comprehensive properties of Al-0.2Zr-0.1Sc were better than those of Al-0.2Zr-0.1Er. The optimal conditions for the Al-0.2Zr-01Sc alloy cable were a microhardness of 575 MPa, an electrical conductivity of 34.5 MS/m for an annealing time of 36 h, and those for the Al-0.2Zr-0.1Er alloy cable were a microhardness of 550 MPa, an electrical conductivity of 33.6 MS/m for an annealing time of 8 h. During the annealing process, dispersed Al{sub 3}(Zr,Sc/Er) precipitates were generated, which substantially impeded recrystallization by Zener pining of grain boundaries. Based on the ratio of volume fraction (F{sub V}) to average diameter ( d-bar ) of the precipitates, their capability to inhibit recrystallization was as follows: Al{sub 3}(Zr, Sc) > Al{sub 3}(Zr, Er) > Al{sub 3}Zr. Moreover, the electrical conductivity of Al-0.2Zr-0.1Sc was better than that of Al-0.2Zr-0.1Er, probably because Sc could better inhibit recrystallization than Er, leading to fewer grain boundaries and hence lesser electron scattering.
- OSTI ID:
- 22805845
- Journal Information:
- Materials Characterization, Vol. 145; Other Information: Copyright (c) 2017 Elsevier Science B.V., Amsterdam, The Netherlands, All rights reserved.; Country of input: International Atomic Energy Agency (IAEA); ISSN 1044-5803
- Country of Publication:
- United States
- Language:
- English
Similar Records
Influence of Sc content on the microstructure and mechanical properties of cast Al-2Li-2Cu-0.5Mg-0.2Zr alloy
METALLURGICAL QUARTERLY PROGRESS REPORT NO. 15 FOR THE PERIOD OF APRIL 1, 1962 THROUGH JUNE 30, 1962