Dependency of the thermal and electrical conductivity on the temperature and composition of Cu in the Al based Al–Cu alloys

Aksöz, Sezen; Ocak, Yavuz; Maraşlı, Necmetti̇n; Çadırlı, Emin; Kaya, Hasan; Böyük, Uğur

doi:10.1016/j.expthermflusci.2010.07.015

Cited by 67 publications

(28 citation statements)

References 11 publications

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“…The thermal conductivity dropped with the Cu concentration from 198 Wm −1 K −1 in Al-1wt%Cu to 164 Wm −1 K −1 in Al-5wt%Cu. These values are consistent with those reported by Aksoz et al [17] and are lower than those presented by Wu et al [18] by 25 Wm −1 K −1 . For the Al-Fe alloys, the thermal conductivity decreased slightly from 213.5 Wm −1 K −1 (in Al with a 99.8 % purity) to 208.5 Wm −1 K −1 (in Al-1.5wt%Fe).…”

Section: Al-cu Al-fe and Al-mg Alloyssupporting

confidence: 93%

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Thermal and electrical conductivity in Al–Si/Cu/Fe/Mg binary and ternary Al alloys

et al. 2015

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This study investigated 30Al-Si, Al-Cu, AlFe, Al-Mg, Al-10Si-Cu, Al-10Si-Fe, and Al-10Si-Mg binary and ternary Al alloys, which are among the most commonly used commercial alloys. The thermal and electrical conductivity of the gravity castings of these alloys were measured. The results indicated that when 1 wt% Si, Cu, or Fe was mixed with commercial Al with 99.8 % purity, the thermal conductivity decreased from 213.5 Wm −1 K −1 to approximately 190-210 Wm −1 K −1 . The thermal conductivity remained at a nearly constant level of 154-157 Wm −1 K −1 when the Si concentration exceeded 6 wt% in the Al-Si alloys. Regarding the Al-Mg alloys, the thermal conductivity did not change when the concentration of Mg was increased to 1 wt%. When the concentration of Mg exceeded 1 wt%, the thermal conductivity decreased greatly from 212.

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Section: Al-cu Al-fe and Al-mg Alloyssupporting

confidence: 93%

“…2). The series model was employed to simulate their composite thermal conductivity by setting the thermal conductivity of the Al 2 Cu precipitate to 30 Wm −1 K −1 in contrast to 108 Wm −1 K −1 [17] in bulk. Therefore, Fig.…”

Section: Discussionmentioning

confidence: 99%

Thermal and electrical conductivity in Al–Si/Cu/Fe/Mg binary and ternary Al alloys

et al. 2015

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“…The heat might accumulate in the θ phase because of the higher thermal conductivity of the α phase as compared with the θ phase for Al-Cu alloys. 47 The heat accumulation led to the increase in the local temperature, which accelerated the rates of chemical and electrochemical reactions. These reactions increased the growth rate of the film on the θ phase.…”

Section: Discussionmentioning

confidence: 99%

Effect of the Cu Content on the Microstructure and Corrosion Behavior of PEO Coatings on Al–xCu Alloys

Zhu

Zhang

et al. 2018

J. Electrochem. Soc.

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In this study, scanning electron microscopy and electrochemical techniques were used to investigate the effect of the Cu content on the microstructure and corrosion resistance of plasma electrolytic oxidation (PEO) coatings on Al-xCu alloys. The results showed that Cu in the substrate alloy was used to promote the intensity and the transformation process of the microdischarges, which led to the undulating-ribbon feature of cross-sectional morphologies. The formation of pores and cracks in the coatings was facilitated by the oxygen release due to the oxidation of O 2− and the dissolution of copper oxide. Meanwhile, the average porosity of PEO coatings distinctly increased with the increase in the Cu content, which is the key factor causing the decreased corrosion resistance of PEO coatings. Due to their high strength to weight ratio, Cu-containing aluminum alloys are one of the most promising materials for use in aerospace and automobile applications. However, their application is limited by low corrosion resistance. Therefore, plasma electrolytic oxidation (PEO) is considered to be a well-known process for the in situ production of oxide coatings on Al and its alloys, which can offer better corrosion protection as compared to the other surface modification processes for substrate alloys. [1][2][3][4] In general, many processing factors, such as the composition of electrolyte, 5-7 additives, 8-10 applied power modes, 11-13 electrical parameters, 14,15 temperature, 16 and oxidation time, 17 are used to control the PEO process. These parameters not only affect the PEO process but also the performance of the prepared coatings. The characteristics of the formed PEO coatings could also be affected by the alloying elements in substrate alloys. However, this has not been studied in much detail. To the best of our knowledge, the literature contains several papers that describe the effect of multiple elements (such as Si, Mg, Cu, Li, and Fe) on the properties of the formed PEO coatings for commercial aluminum alloys.18-20 While, only a few studies focused on the effect of single alloying element in substrate. Among others, Ali et al. studied the PEO treatment of simple binary Al-Si alloys and reported that the thickness of PEO coatings significantly decreased, whereas their porosity increased with the increase in the Si content. The decomposition of volatile silicon oxides, such as SiO in the formed coatings during the PEO process, contributed to the high porosity. Furthermore, Si exhibits low electrical conductivity, which adversely affects the formation of microdischarges and the oxidation kinetics of the alloy. 21 Meanwhile, Oh et al. studied the effect of Mg on the properties of PEO coatings on Al-Mg alloys and demonstrated that when the amount of Mg was higher than 3 wt% the formation of α-Al 2 O 3 was inhibited.22 It is also reported that Zn is the primary alloying element for the 7××× series Al alloys, and the peculiar function of Zn during the formation of PEO coatings on binary Al-Zn alloys has also been investig...

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“…In the case of γAl 2 O 3 , this can be readily explained by the high electric resistivity of alumina at room temperature, which is estimated to exceed 10 12 Ω·m [22]. The decrease in conductivity of the wire when copper was added is explained by S. Aksöz [31]. % IACS = 64.62 − 26.96·wt % Al 2 O 3 − 7.46·wt % Cu − 0.13·T+8.84·wt % Cu·wt % Al 2 O 3 …”

Section: Discussionmentioning

confidence: 99%

Strengthening of Aluminum Wires Treated with A206/Alumina Nanocomposites

Florián-Algarín

Marrero

et al. 2018

Materials

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This study sought to characterize aluminum nanocomposite wires that were fabricated through a cold-rolling process, having potential applications in TIG (tungsten inert gas) welding of aluminum. A206 (Al-4.5Cu-0.25Mg) master nanocomposites with 5 wt % γAl2O3 nanoparticles were first manufactured through a hybrid process combining semi-solid mixing and ultrasonic processing. A206/1 wt % γAl2O3 nanocomposites were fabricated by diluting the prepared master nanocomposites with a monolithic A206 alloy, which was then added to a pure aluminum melt. The fabricated Al–γAl2O3 nanocomposite billet was cold-rolled to produce an Al nanocomposite wire with a 1 mm diameter and a transverse area reduction of 96%. Containing different levels of nanocomposites, the fabricated samples were mechanically and electrically characterized. The results demonstrate a significantly higher strength of the aluminum wires with the nanocomposite addition. Further, the addition of alumina nanoparticles affected the wires’ electrical conductivity compared with that of pure aluminum and aluminum–copper alloys. The overall properties of the new material demonstrate that these wires could be an appealing alternative for fillers intended for aluminum welding.

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Dependency of the thermal and electrical conductivity on the temperature and composition of Cu in the Al based Al–Cu alloys

Cited by 67 publications

References 11 publications

Thermal and electrical conductivity in Al–Si/Cu/Fe/Mg binary and ternary Al alloys

Thermal and electrical conductivity in Al–Si/Cu/Fe/Mg binary and ternary Al alloys

Effect of the Cu Content on the Microstructure and Corrosion Behavior of PEO Coatings on Al–xCu Alloys

Strengthening of Aluminum Wires Treated with A206/Alumina Nanocomposites

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