Details

Autor(en) / Beteiligte

• Li, W.
• Yang, L.
• Zhang, Y.G.
• Kong, L.T.
• Li, J.F.

Titel

Influences of Si addition on the thermal stability and crystallization behavior of Al-Y binary amorphous alloys

Ist Teil von

• Journal of alloys and compounds, 2021-08, Vol.873, p.159816, Article 159816

Ort / Verlag

Lausanne: Elsevier B.V

Erscheinungsjahr

2021

Quelle

Alma/SFX Local Collection

Beschreibungen/Notizen

• •Minor Si was added to Al90Y10 amorphous alloy.•The primary crystallization of α-Al is split into two stages with 2.5 at% or more Si addition.•The Si addition depresses the precipitation of Al4Y but promotes the formation of Al3Y.•The Si addition stabilizes α-Al3Y phase significantly.•The strong interaction between Si and Y resulted in the abnormal crystallization. [Display omitted] In the present study, the crystallization behavior of (Al90Y10)100−xSix (x = 0, 1, 2, 2.5 and 3 at%) amorphous alloys were characterized by differential scanning calorimetry, X-ray diffraction and transmission electron microscopy. As Si is added to the Al90Y10 base amorphous alloy, the primary crystallization of α-Al is advanced to lower temperature, the precipitation of Al4Y in the residual amorphous phase is depressed but the crystallization of Al3Y is promoted. The Si addition stabilizes the α-Al3Y phase significantly, due to which both the as-cast ingot and the fully crystallized ribbon of (Al90Y10)98Si2 alloy consist of α-Al and α-Al3Y, whereas the corresponding products in Al90Y10 alloy are α-Al and β-Al3Y. The addition of 2.5 at% Si makes the crystallization of α-Al split into two stages with a temperature interval of 140 K between the two peaks. The reason is thought to be related with the enhanced concentration fluctuation in amorphous alloy and the slower diffusion of Y atoms in crystallization after the Si addition.