Effect of heat treatment on structural changes in metastable AlSi10mg alloy
This paper presents a study on structural changes occurring in a rapidly quenched metastable AlSi10Mg alloy during heating cycles within the temperature range from room temperature to 800 K. Measurement of electrical resistivity of a ribbon showed that structural stabilization takes place a...
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| Main Authors: | , , , , |
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| Format: | Article |
| Language: | English |
| Published: |
University of Belgrade, Technical Faculty, Bor
2014-01-01
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| Series: | Journal of Mining and Metallurgy. Section B: Metallurgy |
| Subjects: | |
| Online Access: | http://www.doiserbia.nb.rs/img/doi/1450-5339/2014/1450-53391400011J.pdf |
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| Summary: | This paper presents a study on structural changes occurring in a rapidly
quenched metastable AlSi10Mg alloy during heating cycles within the
temperature range from room temperature to 800 K. Measurement of electrical
resistivity of a ribbon showed that structural stabilization takes place at
temperatures ranging from 450 K to 650 K. The isotherms of the electrical
resistivity measured at temperatures 473 K, 483 K and 498 K revealed two
stages of structural stabilization i.e. a kinetic process and diffusion
process. Measurement of the thermoelectromotive force of the thermocouple
made from the investigated alloy and a copper conductor by a mechanical
joining was used to determine relative changes in the electron density of
states of the quenched sample after successive heat treatments. The same
alloy sample was subjected to successive heat treatments at temperatures up
to 503 K, 643 K, 683 K and 763 K. The change in the thermopower suggested
that each heating was followed by an increase in free electron density in the
alloy. Therefore, the abrupt decline in electrical resistivity was induced by
an increase in both the mean free electron path and free electron density
during the thermal stabilization of the structure. [Projekat Ministarstva
nauke Republike Srbije, br. OI 172057: Controlled synthesis, structure and
properties of multifunctional materials] |
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| ISSN: | 1450-5339 |