Effect of Precipitation and Dissolution of Si on the Thermal Diffusivity in the Al-Si Alloy System

Yumi Kim; Youngchan Kim; Seweon Choi

doi:10.3740/MRSK.2020.30.9.474

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2020 Vol.30, Issue 9 Preview Page Next Page

Effect of Precipitation and Dissolution of Si on the Thermal Diffusivity in the Al-Si Alloy System 열처리를 통한 Si 고용 및 석출 반응이 Al-Si 합금의 열확산도에 미치는 영향

September 2020. pp. 474-479

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Abstract

The effect of precipitation and dissolution of Si on the thermal diffusivity in the Al-Si alloy system is reported in this study and solution heat treatment followed by aging treatment is carried out to determine the effects of heat treatment on the thermal characteristics. The solution treatment is performed at 535 ºC for 4 and 10 h and then the specimens are cooled by rapid quenching. The samples are aged at 300 ºC for 4 h to precipitate Si solute. The addition of 9 wt% silicon contents makes the thermal diffusivity decrease from 78 to 74 mm/s² in the cases of solid solution treated and quenched samples. After quenching and aging, the Si solute precipitates on the Al matrix and increases the thermal diffusivity compared with that after the quenched state. In particular, the increase of the thermal diffusivity is equal to 10 mm/s² without relation to the Si contents in the Al-Si alloy, which seems to corresponded to solute amount of Si 1 wt% in the Al matrix.

Keywords

thermal diffusivity

aluminum-silicon system

thermal analysis

Si precipitation

Si dissolution

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Information

Publisher :Materials Research Society of Korea
Publisher(Ko) :한국재료학회
Journal Title :Korean Journal of Materials Research
Journal Title(Ko) :한국재료학회지
Volume : 30
No :9
Pages :474-479
Received Date : 2020-07-09
Revised Date : 2020-08-13
Accepted Date : 2020-08-13
DOI :https://doi.org/10.3740/MRSK.2020.30.9.474

Korean Journal of Materials Research ISSN:1225-0562(Print) 2287-7258(Online) 한국재료학회지

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