Effect Law and Mechanism of Sn Content on the Microstructure and Melting Characteristics of Cu-34Mn-6Ni Brazing Filler Metals

ZHANG Mingyue; ZHANG Min'an; XU Yonggang; ZHANG Song

doi:10.7512/j.issn.1001-2303.2023.01.01

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Effect Law and Mechanism of Sn Content on the Microstructure and Melting Characteristics of Cu-34Mn-6Ni Brazing Filler Metals
Vol. 53, Issue 1, Pages: 1-8(2023)
DOI： 10.7512/j.issn.1001-2303.2023.01.01

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张明月，张民安，胥永刚，等.Sn含量对Cu-34Mn-6Ni钎料微观组织和熔化特性的影响规律和机理［J］.电焊机，2023，53（1）：1-8.

ZHANG Mingyue, ZHANG Min'an, XU Yonggang, et al.Effect Law and Mechanism of Sn Content on the Microstructure and Melting Characteristics of Cu-34Mn-6Ni Brazing Filler Metals[J].Electric Welding Machine, 2023, 53(1): 1-8.
张明月，张民安，胥永刚，等.Sn含量对Cu-34Mn-6Ni钎料微观组织和熔化特性的影响规律和机理［J］.电焊机，2023，53（1）：1-8. DOI： 10.7512/j.issn.1001-2303.2023.01.01.

ZHANG Mingyue, ZHANG Min'an, XU Yonggang, et al.Effect Law and Mechanism of Sn Content on the Microstructure and Melting Characteristics of Cu-34Mn-6Ni Brazing Filler Metals[J].Electric Welding Machine, 2023, 53(1): 1-8. DOI： 10.7512/j.issn.1001-2303.2023.01.01.

摘要

为实现MnCuAl阻尼合金与430不锈钢的良好钎焊连接，研制了6种含Sn元素的钎料，探究Sn含量对Cu-34Mn-6Ni钎料微观组织和熔化特性的影响规律和机理。结果表明，在720 ℃、保温10 h的固溶条件下，Sn在Cu-34Mn-6Ni合金中的饱和固溶度约为6%，当,w,（Sn）≥6%时，在合金组织的基体相γ-（Cu，Mn）之间产生具有体心立方结构的富锡相Cu,17,Sn,3,，此相的数量随Sn含量的增加而逐渐增加，并在,w,（Sn）=10%的钎料中占比超过基体相。Sn的加入会引起钎料基体相发生晶格畸变，基体相的晶格常数随着Sn含量增加而逐渐增大，最大时其变化率可达到0.725 3%。Sn含量的升高使钎料液相点显著降低，富Sn相的液相点低于基体相液相点，从而导致钎料熔化区间变宽。在,w,（Sn）=6%时钎料的熔化区间最大，之后随着Sn含量的进一步增加宽化程度减小。

Abstract

In order to achieve favourable brazing between MnCuAl damping alloy and 430 stainless steel, the fillers with different Sn contents were designed and developed, and the effect and mechanism of Sn content on microstructures and melting characteristics of Cu-34Mn-6Ni filler were investigated. The results show that the saturated solid solubility of Sn in Cu-34Mn-6Ni alloy is about 6 wt. % at 720 ℃ and holding for 10 h. When the content of Sn exceeds 6% (including), the Sn-rich BCC Cu,17,Sn,3, phases form among the matrix phase γ-(Cu,Mn). The amount of this Sn-rich phases gradually increases with the increasing Sn content, and its proportion in the filler will be higher than the matrix when the Sn content is 10%. The addition of Sn causes lattice distortion of the matrix phase. The lattice constant of the matrix phase gradually increases with the increasing Sn content, and the maximum swelling rate reaches 0.725 3%. With the increase of Sn content, the liquid point of filler decreases significantly. The liquid point of the Sn-rich phase is lower than that of the matrix phase, which makes the melting interval of the filler wider. The melting interval of the filler metal is the largest when the content of Sn is 6%, and then the width becomes smaller with the further increase of Sn content.

关键词

Cu-Mn-Ni-xSn钎料显微组织熔化特性异种材料钎焊

Keywords

Cu-Mn-Ni-xSn brazing filler metalmicrostructuremelting characteristicsbrazing of dissimilar metals

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