Microstructure transformation of rapidly solidified high-silicon aluminum alloy during heating process

doi:10.13251/j.issn.0254-6051.2020.05.009

Abstract

Abstract: The rapidly solidified powders of a high-silicon aluminum alloy were manufactured by gas atomization process. The microstructure and structural characteristics of the alloy with different powder size as well as the transformation of needle iron-rich phase and the coarsening behavior of β-Si phase were investigated by means of OM, SEM and so on. The results show that the microstructure of the rapidly solidified alloy is mainly characterized by a large number of fine granular and needle-like phases distributed in the matrix. During the heating process, with the increase of temperature and holding time, granular β-Si phase becomes coarser, the needle-like metastable non-equilibrium iron-rich phase changes into stable clubbed or granular phase gradually. The results of simulated stepped heating experiments show that microstructures with the needle-like phase almost disappeared and with the granular β-Si phase not obviously coarsened can be obtained.

Key words: rapid solidification, high-silicon aluminum alloy, microstructure transformation

CLC Number:

TB31

Wu Xiaoping, Nie Junhui. Microstructure transformation of rapidly solidified high-silicon aluminum alloy during heating process[J]. Heat Treatment of Metals, 2020, 45(5): 45-50.

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