Phase and microstructure formation in rapidly solidified Cu-Sn and Cu-Sn-Ti alloys

JOURNAL OF ALLOYS AND COMPOUNDS

卷:735

Article

Li, X.^1,3  Ivas, T.¹  Spierings, A. B.²  Wegener, K.³  Leinenbach, C.¹ 

[1] Empa Swiss Fed Labs Mat Sci & Technol, Uberlandstr 129, CH-8600 Dubendorf, Switzerland

[2] Inspire AG, Innovat Ctr Addit Mfg Switzerland, Lerchenfeldstr 3, CH-9014 St Gallen, Switzerland

[3] Swiss Fed Inst Technol, Inst Machine Tools & Mfg, Leonhardstr 21, Zurich, Switzerland

关键词: Rapid solidification;    Tin bronze;    Microstructure;    Phase transitions;    Thermodynamic modeling;   

DOI  :  10.1016/j.jallcom.2017.11.237

来源: Elsevier

【 摘 要 】

In this work, the microstructure and phase formation in binary Cu-Sn and ternary Cu-Sn-Ti alloys under rapid solidification conditions are studied as a function of alloy composition and cooling rate and compared to the results from solidification at low cooling rate in a Differential Scanning Calorimetry furnace. At high cooling rates (10(3)-10(4) K/s) a metastable Cu5.6Sn phase is observed in all selected binary alloys, which could be explained to have formed via diffusionless martensitic transformation from the parent beta phase. An increasing amount of Sn results in the transition of preferential phase formation in the sequence of alpha, Cu5.6Sn and delta. In the ternary alloys, Ti is observed to form (Cu, Sn )(3)Ti-5 compound at both low and high cooling rates due to the low solubility of Ti in the a phase, and the fraction of (Cu, Sn)(3)Ti-5 and a phases tend to increase with increasing Ti amount but that of Cu5.6Sn decreases. The results are of relevance for the development and optimization of Cu-Sn based alloys for processing techniques involving rapid solidification with varying cooling rates, e.g. laser additive manufacturing. (C) 2017 Elsevier B.V. All rights reserved.

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