Barothermography and microstructure of the hypoeutectic and eutectic alloys in Al–Si system

Barothermography and microstructure of the hypoeutectic and eutectic alloys in Al–Si system

Differential barothermal analysis (DBA or HP-DTA) of the phase transformations in hypoeutectic Al-10 at.% Si and eutectic Al-12 at.% Si alloys was carried out at 100 MPa of argon pressure and at temperatures up to 700 °C. Liquidus temperature of Al-10 at.% Si is reduced during melting and crystalliz...

Full description

Saved in:
Bibliographic Details
Published in:Journal of thermal analysis and calorimetry Vol. 121; no. 1; pp. 485 - 490
Main Authors: Dediaeva, Elena, Padalko, Anatol, Akopyan, Torgom, Suchkov, Alexei, Fedotov, Vladimir
Format: Journal Article
Language:English
Published: Dordrecht Springer Netherlands 01-07-2015
Springer
Subjects:
Alloys
Analytical Chemistry
Chemistry
Chemistry and Materials Science
Comparative analysis
Degassing of metals
Inorganic Chemistry
Measurement Science and Instrumentation
Metals
Patients' rights
Physical Chemistry
Polymer Sciences
Precipitation (Meteorology)
Specialty metals industry
Thermal expansion coefficient
Aluminum alloys
Thermal analysis
Microstructure
Hot isostatic pressing
Silumins
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:Differential barothermal analysis (DBA or HP-DTA) of the phase transformations in hypoeutectic Al-10 at.% Si and eutectic Al-12 at.% Si alloys was carried out at 100 MPa of argon pressure and at temperatures up to 700 °C. Liquidus temperature of Al-10 at.% Si is reduced during melting and crystallization by 3–4 °C as compared with the atmospheric pressure data. Increase in the eutectic transformation L → (Al) + Si temperature up to 580–581 °C during heating was found for the Al-10 at.% Si and Al-12 at.% Si alloys. According to the barothermography data, a slight thermal effect at 553 °C is detected for both alloys, which was identified as the decomposition of aluminum-based solid solution and precipitation of silicon particles. The improvement of silicon phase morphology for Al-10 at.% Si and Al-12 at.% Si alloys after hot isostatic pressing (HIP) at the pressure of 100 MPa and temperature of 550 °C was found. No porosity in the alloy has been established after HIP treatment. After HIP thermal expansion, coefficients of the alloy are noticeably decreased by 25 (Al-10 at.% Si) and 50 % (Al-12 at.% Si).
ISSN:1388-6150
1588-2926
DOI:10.1007/s10973-015-4731-9