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Title: Deformation processed Al/Ca nano-filamentary composite conductors for HVDC applications

Efficient long-distance power transmission is necessary as the world continues to implement renewable energy sources, often sited in remote areas. Light, strong, high-conductivity materials are desirable for this application to reduce both construction and operational costs. In this study an Al/Ca (11.5% vol.) composite with nano-filamentary reinforcement was produced by powder metallurgy then extruded, swaged, and wire drawn to a maximum true strain of 12.7. The tensile strength increased exponentially as the filament size was reduced to the sub-micron level. In an effort to improve the conductor's ability to operate at elevated temperatures, the deformation-processed wires were heat-treated at 260°C to transform the Ca-reinforcing filaments to Al 2Ca. In conclusion, such a transformation raised the tensile strength by as much as 28%, and caused little change in ductility, while the electrical conductivity was reduced by only 1% to 3%. Al/Al 2Ca composites are compared to existing conductor materials to show how implementation could affect installation and performance.
Authors:
 [1] ;  [2] ;  [3] ;  [2]
  1. Ames Lab., Ames, IA (United States); Iowa State Univ., Ames, IA (United States). Materials Science and Engineering; Iowa State Univ., Ames, IA (United States). Wind Energy Science, Engineering, and Policy
  2. Ames Lab., Ames, IA (United States); Iowa State Univ., Ames, IA (United States). Materials Science and Engineering
  3. Ames Lab., Ames, IA (United States)
Publication Date:
Report Number(s):
IS-J-9725
Journal ID: ISSN 1757-8981
Grant/Contract Number:
AC02-07CH11358
Type:
Accepted Manuscript
Journal Name:
IOP Conference Series. Materials Science and Engineering
Additional Journal Information:
Journal Volume: 219; Journal ID: ISSN 1757-8981
Publisher:
IOP Publishing
Research Org:
Ames Laboratory (AMES), Ames, IA (United States)
Sponsoring Org:
USDOE
Country of Publication:
United States
Language:
English
Subject:
24 POWER TRANSMISSION AND DISTRIBUTION
OSTI Identifier:
1464478