Home Kovove Materialy-Metallic Materials 2011 Metallic Materials Vol. 49 (2011), no. 2, pp.101-106

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Metallic Materials Vol. 49 (2011), no. 2, pp.101-106

Title: Analysis of precipitation kinetics in Al-Ge and Al-Ge-Si alloys by dilatometry
Author: SEMNANI, H. R. M., FALAHATI, A., DEGISCHER, H. P.

Abstract: The present work is concerned with the precipitation kinetics of Al-Ge (Si) alloys with different amounts of Ge and Si. Continuous heating and isothermal dilatometry are used successfully to identify the formation and dissolution of Ge or Si-Ge precipitates. Differential Scanning Calorimetry on the same samples confirms the temperatures of precipitation and dissolution. The formation and dissolution of precipitates are studied after different thermal histories. The precipitation kinetics of AlGe1 samples is significantly slower than that of alloys containing more Ge. The apparent activation energy determined from thermal expansion peaks during heating is 20 % smaller for AlGe3 than for AlGe1.

Keywords: Al alloys, precipitation kinetics, thermal expansion, differential scanning calorimetry, isothermal dilatometry
Year: 2011, Volume: 49, Issue: 2 Page From: 101, Page To: 106
doi:10.4149/km_2011_2_101


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