Effect of Heat Treatment on Microstructure of La1.7Fe11.6Si1.4 Alloy

19 Sep 2019, 09:00
15m
Панорамный конференц-зал, 6 этаж ()

Панорамный конференц-зал, 6 этаж

Oral Sustainable Use of Natural Resources/Рациональное природопользование Green Chemistry/Зеленая химия

Speaker

Kai Sun

Description

The non-stoichiometric ratio of La1.7Fe11.6Si1.4 was prepared by the addition of La. The microstructure, phase formation and magnetocaloric property of La1.7Fe11.6Si1.4 were studied under different heat treatment conditions. The experiments were carried out by vacuum levitation melting and quick quenching method with pulverized quick-setting method to obtain the quick-acting sheet of La1.7Fe11.6Si1.4, and the mother alloys were annealed at 850 ℃, 950 ℃, 1000 ℃, 1050 ℃ and 1100 ℃ respectively sample. The mother alloys and samples were examined by scanning electron microscopy and X-ray diffraction. The experimental results show that there are many similar α-Fe dendrites in the as-cast state at 950 ℃ and agglomerate into the granular α-Fe at the proper temperature. There are many La(Fe,Si)13 phases at 1050 ℃, α-Fe phase and LaFeSi phase decrease. It is verified that the La-Fe-Si based La-rich alloy can be annealed at a relatively low temperature for a short time and the La(Fe,Si)13 phase is transformed from the α-Fe phase and the LaFeSi phase ; At 1100 ℃ there will be more α-Fe agglomeration into large particles, while the 1:13 phase tends to be stable. Finally, the magnetic properties of the better samples were tested to determine the best annealing time and annealing temperature.

Affiliation of speaker Иркутский национальный исследовательский технический университет
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