Comparative study of electrical and mechanical properties of fire-refined and electrolytically refined cold-drawn copper wires

Martínez, Mónica García; Fernández, A. Inés; Segarra, M.; Xuriguera, E.; Espiell, F.; Ferrer, Núria

doi:10.1007/s10853-007-1647-1

Cited by 4 publications

(3 citation statements)

References 3 publications

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“…Last decade, the study of both electrical and mechanical properties for both the fire-refined high-conductivity (FRHC) and electrolytically tough pitch (ETP) copper wires in colddrawn samples has been widely investigated (Ref [1][2][3][4][5]. They reported some properties of fire-refined copper melted from scrap as well as the annealing treatment may be controlled by hardness measurements (Ref 1).…”

Section: Introductionmentioning

confidence: 99%

Mechanical Characterization of Copper-Copper Wires Joined by Friction Welding Using Instrumented Indentation Technique

Morales

Xuriguera

Martínez

et al. 2014

J. of Materi Eng and Perform

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Friction welding samples of both the fire-refined high-conductivity (FRHC) and electrolytically tough pitch (ETP) copper alloy wires have been mechanically characterized by instrumented indentation technique and tensile test. Hardness profiles in the perpendicular direction to the weld interface, in both the central and peripheral zones, of the as-welded FRHC-FRHC and ETP-ETP samples have been investigated at nano-/ micrometric scale. The microstructures of welds have been observed using both the optical microscopy and scanning electronic microscopy. The results show the typical friction welding zones: the interface zone, the thermo-mechanically affected zone (TMAZ), and the transition zone between the TMAZ and the base metal zone (BMZ) that present a microstructure and hardness close to the base metal. No presence of a heataffected zone is observed. Although both welds show the same tendency in hardness distribution, FHRC-FHRC weld presents a TMAZ narrower than ETP-ETP one, which produces a stronger drop in hardness with increasing of the distance from welding central line, and a higher difference in hardness between the central and peripheral zones. The tensile tests of ETP-ETP welds showed that all samples broke by the BMZ that is far away from the interface of the welded joint, while the most of the FRHC-FRHC welds are broken at the TMAZ region at low strengths. These appreciable differences in mechanical properties for the FHRC-FHRC welds are probably generated by a stronger variation in their microstructural properties. Therefore, it may justify the welding failures in the FHRC-FHRC weld at the typical tensile stress for an industrial cold-drawn process of wires.

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Section: Introductionmentioning

confidence: 99%

Mechanical Characterization of Copper-Copper Wires Joined by Friction Welding Using Instrumented Indentation Technique

Morales

Xuriguera

Martínez

et al. 2014

J. of Materi Eng and Perform

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“…Valores de limite de resistência à tração após tratamento de recozimento em cobre eletrolitico (ETP) e ligas de cobre refinado a fogo (PMA1, PMA2 e PMA3 trabalhadas a frio) a diferentes temperaturas por uma hora [18].…”

Section: 5unclassified

“…Valores de condutividade após tratamento térmico a diferentes temperaturas, em cobre eletrolitico (ETP) e ligas de cobre (PMA1, PMA2 e PMA3) trabalhadas a frio a diferentes temperaturas por uma hora [18]. A melhora nas propriedades mecânicas, com a adição do elemento de liga magnésio, trouxe uma diminuição na condutividade, mas para valores entre 0,1 e 0,3 % massa de magnésio, os índices I.A.C.S.…”

Section: 5unclassified

Obtenção de fios em ligas cobre-magnésio para utilização em linhas de transmissão de energia elétrica

Fernandes

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Hardness of FRHC-Cu Determined by Statistical Analysis

Roa

Martínez

Rayón

et al. 2013

J. of Materi Eng and Perform

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A statistical indentation method has been employed to study the hardness value of fire-refined high conductivity copper, using nanoindentation technique. The Joslin and Oliver approach was used with the aim to separate the hardness (H) influence of copper matrix, from that of inclusions and grain boundaries. This approach relies on a large array of imprints (around 400 indentations), performed at 150 nm of indentation depth. A statistical study using a cumulative distribution function fit and Gaussian simulated distributions, exhibits that H for each phase can be extracted when the indentation depth is much lower than the size of the secondary phases. It is found that the thermal treatment produces a hardness increase, due to the partly re-dissolution of the inclusions (mainly Pb and Sn) in the matrix.

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Comparative study of electrical and mechanical properties of fire-refined and electrolytically refined cold-drawn copper wires

Cited by 4 publications

References 3 publications

Mechanical Characterization of Copper-Copper Wires Joined by Friction Welding Using Instrumented Indentation Technique

Mechanical Characterization of Copper-Copper Wires Joined by Friction Welding Using Instrumented Indentation Technique

Obtenção de fios em ligas cobre-magnésio para utilização em linhas de transmissão de energia elétrica

Hardness of FRHC-Cu Determined by Statistical Analysis

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