Thermopower of dilute aluminium alloys and α-brass at elevated temperatures

Rosenfeld, A. M.; Timsit, R. S.

doi:10.1080/13642818408227630

Cited by 6 publications

(4 citation statements)

References 12 publications

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“…The leveling off and pronounced oscillations of the age-hardening curves in Fig. (1a), which were observed previously [15], were found in these curves beyond 443K provide a clear indication of instability. The hardness peaks observed for all the curves may correspond to different aging processes.…”

Section: Discussionsupporting

confidence: 84%

“…. It was proposed [15] that the observed oscillations in hardness curves of Figs. 1and 4 can be explained by the retention of iron, which is an impurity element of 0.143 wt.% in the present tested Al-Mg alloy, in the supersaturated solid solution after casting and wire drawing, and then its subsequent precipitation during aging.…”

Section: Discussionmentioning

confidence: 98%

“…The hardness peaks observed for all the curves may correspond to different aging processes. These oscillations are readily understood in terms of competition between a metallurgical reaction concerning the structure variations [15], besides the very effective role of Mg in reducing the rate of creep [4b], which tend to increase the hardness and the thermally induced intrinsic decrease in hardness with increasing aging temperature. The hardness therefore never produces the behaviour of homogeneity and stabilization as long as the reaction proceeds to completion until competition comes to an end and then a certain regular behaviour dominates, which is not attained in the curves obtained in the tested temperature range under the applied loads and the dwell times considered.…”

Section: Discussionmentioning

confidence: 99%

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Anomalous Behaviour for Microhardness of Al-3wt.% Mg alloy

2010

Egyptian Journal of Solids

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Microhardness measurements, H, were obtained for sheets of Al-3wt.% Mg alloy in the temperature range 443-503 K, applied loads 10-300 gm and dwell times 10-40 sec. The age-hardening curves showed off leveling and pronounced oscillations indicating instability reflecting a competition between the effect of dynamic recovery or sub-structures coarsening and the effect of solute drag and precipitation hardening. The indentation size effect index (ISE), m, was calculated as 2 for the binary alloy indicating that, H, is independent on indentation size. Increasing temperature, T, load, L, and dwell time, t, caused a decrease in, H, due to the decrease of the amount of free Mg available for further precipitation hardening during the aging process. In general, increasing temperature, dwell time, applied load caused a decrease in hardness.

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Section: Discussionsupporting

confidence: 84%

Section: Discussionmentioning

confidence: 98%

Section: Discussionmentioning

confidence: 99%

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Anomalous Behaviour for Microhardness of Al-3wt.% Mg alloy

2010

Egyptian Journal of Solids

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“…In principle, the Seebeck coefficient S is not determined correctly by eq. , since the thermopower of brass is not considered . However, its value of −0.49 μVK −1 at room temperature ( T = 300 K) and −0.13 μVK −1 at 450 K can be neglected compared to the Seebeck coefficient of Sn 0.85 Sb 0.15 O 2 .…”

Section: Methodsmentioning

confidence: 99%

Optimization of thermoelectric properties of metal‐oxide‐based polymer composites

Plochmann

Lang

Rüger

et al. 2013

J of Applied Polymer Sci

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Thermoelectric modules can be used for thermal energy harvesting. Common rigid thermoelectric stacks usually contain heavy metal alloys such as Bi 2 Te 3 . In order to substitute conventional materials and to reduce manufacturing costs, nontoxic, inexpensive and abundant materials using low-cost processes are first choice. This study deals with polymer composites consisting of a polysiloxane matrix filled with thermoelectric Sn 0.85 Sb 0.15 O 2 particles in micrometer scale. Thin composite sheets have been prepared by doctor blade technique and the Seebeck coefficient, the electrical and thermal conductivity, and the porosity were measured. Platelet-type particles, consisting of Sn 0.85 Sb 0.15 O 2 -coated insulating mica substrate and globular Sn 0.85 Sb 0.15 O 2 particles have been varied in size, coating thickness and were mixed with each other in different ratios. The filler content was varied in order to maximize the figure of merit, ZT, to 1.9 3 10 25 6 4 3 10 26 . Owing to their low raw material costs and the high degree of design freedom of polymer composites, one may use these materials in thermoelectric generators for remote low-power demanding applications.

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Phonon Drag Contribution to the Thermopower of Simple Metals

Schubert

Christoph

1986

Physica Status Solidi (b)

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Thermopower of dilute aluminium alloys and α-brass at elevated temperatures

Cited by 6 publications

References 12 publications

Anomalous Behaviour for Microhardness of Al-3wt.% Mg alloy

Anomalous Behaviour for Microhardness of Al-3wt.% Mg alloy

Optimization of thermoelectric properties of metal‐oxide‐based polymer composites

Phonon Drag Contribution to the Thermopower of Simple Metals

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