A method for strengthening cu-12sn-1.5ni alloy by nano-particle-fine grain structure

Abstract

A method for strengthened Cu-12Sn-1.5Ni alloy of a nanoparticle-fine crystal structure is characterized in that trace iron is added on the basis of the chemical components of Cu-12Sn-1.5Ni alloy. Thechemical components include, in percentage by mass, (9.0-12.5) Sn, (1.3-2.0) Ni, (0.03-1.5) Fe (wt%), and the balance Cu. According to the method, an electromagnetic induction heating mode is adoptedto smelt and cast Cu-12Sn-1.5 Ni-(0.03-1.5) Fe (wt.%) alloy. The method has the advantage that the iron-enriched nanoparticle-fine crystal structure and fine dispersion of large continuous delta segregation phase transition are formed in the as-cast Cu-12Sn-1.5Ni alloy through the trace iron-induction melting coupling effect. Due to the synergistic strengthening effect of the nanoparticle-fine crystal structure and the weakening of the fine and dispersed delta phase to the plastic damage, the as-cast Cu-12Sn-1.5 Ni-(0.03-1.5) Fe (wt.%) alloy has both high strength and high plasticity, and hasexcellent comprehensive properties. The method disclosed by the invention is simple in process and high in applicability, and can be used for preparing bulky Cu-12Sn-1.5 Ni-(0.03-1.5) Fe (wt.%) alloymembers with complex shapes.

Description

Technical field: [0001] The present invention relates to cast metal structural materials and a preparation method thereof. Specifically, a structure of a fine micron-grain-grain internally distributing a highly dispelled nano-stream in the Cu-12SN-1.5Ni alloy is prepared by a microalloying method and a casting process, i.e., nanoparticle-fine crystallite structure. The strength and plasticity of the material are thus greatly improved. Background technique [0002] Casting Cu-12SN-1.5Ni alloys is often used as a worm gear, gear and bearing such as a worm gear, gear and bearing, such as a worm gear, gear and bearing, such as a worm gear, gear and bearing, etc. [Document " 378-5 (V.2). Document Two Peterr.n.childs, 11-Worm Gears, Editor (s): Peter Rnchilds, Mechanical DesigneEryering Handbook (Second Edition), Butterworth-Heinemann, 2019, Pages 513-531, ISBN9780081023679, HTTPS: / / DOI.ORG / 10.1016 / B978-0-08-102367-9.00011-1. Document three V.fontanari, M.BENEDETTI, G.straffelini, Ch....

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Problems solved by technology

In view of the effective application of iron in copper in the early stage and its low-cost advantages, this paper aims to produce a Cu-Sn-Ni alloy without rapid cooling, centrifugal casting and age hardening, that is, without heat treatment and ordinary casting conditions. The introduction of trace amounts of iron in Cu-Sn-Ni alloy system synergistically improves its strength, ductility and wear resistance. Previous studies on the strengthening of iron elements in the Cu-Sn-Ni alloy system have never been carried out.

In addition, the iron content (or iron + cobalt content) used in the early application of iron in copper was greater than 1.5wt.% [Literature 6 X.H.Chen, Z.D.Wang, D.Ding, et al., Mater.Des.66(2015 )60–66. Literature 7 Z.D.Wang, X.W.Wang, Q.S.Wang, et al., Nanotechnology 20(2009) 075605. Literature 8 K.X.Chen, X.H.Chen, D.Ding, et al., Mater.Des.94(2016 ) 338–344. Literature Nine Y.X.Ye, X.Y.Yang, C.Z.Liu, et al., Mater.Sci.Eng.A 612 (2014) 246-252. al.,J.Alloy.Compd.763(2018)592-605.], largely ignored the strengthening and toughening effect of trace iron elements

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