Cu和Sn对钎焊料4343Al合金组织性能的影响

doi:10.11901/1005.3093.2015.680

材料研究学报

2016, Vol. 30

Issue (4): 292-298 DOI: 10.11901/1005.3093.2015.680

本期目录 | 过刊浏览

Cu和Sn对钎焊料4343Al合金组织性能的影响

赵媛媛, 章桢彦, 靳丽, 董杰(

)

上海交通大学材料科学与工程学院轻合金精密成型国家工程研究中心上海 200240

Effect of Cu and Sn Addition on Microstructure and Properties of Brazing Filler 4343 Al Alloy

ZHAO Yuanyuan, ZHANG Zhenyan, JIN Li, DONG Jie^*(

)

National Engineering Research Center of Light Alloy Net Forming, Schools of Materials Science and Engineering, Shanghai Jiao Tong University, Shanghai 200240, China

引用本文:

赵媛媛, 章桢彦, 靳丽, 董杰. Cu和Sn对钎焊料4343Al合金组织性能的影响[J]. 材料研究学报, 2016, 30(4): 292-298.
Yuanyuan ZHAO, Zhenyan ZHANG, Li JIN, Jie DONG. Effect of Cu and Sn Addition on Microstructure and Properties of Brazing Filler 4343 Al Alloy[J]. Chinese Journal of Materials Research, 2016, 30(4): 292-298.

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摘要:

通过添加0-1.0%(质量分数)的Cu或Sn来合金化4343合金, 获得一种熔点更低、抗塌陷性能更优良的钎焊材料。熔点测试结果表明, 随Cu或Sn含量的增加, 合金的固相线温度和液相线温度逐渐降低, 添加1.0%的Cu或Sn后合金固相线温度、液相线温度降低10-15℃。微观组织和挤压变形后力学性能研究结果表明, 随Cu或Sn含量的增加, 铸态合金中含Cu的第二相量或Sn颗粒逐渐增多; 热挤压后含Cu第二相趋于溶解, 而Sn促进含Si、Fe第二相溶解; 合金室温抗拉强度逐渐升高, 但延伸率略有降低。模拟钎焊实验结果表明, 添加Cu或Sn可降低4343合金的可钎焊温度, 添加1.0%的Cu或Sn可使钎焊温度降低15-20℃。

关键词 ：金属材料, 4343铝合金, 微合金化, 熔点, 钎焊

Abstract：

The 4343 Al-Si alloy is the most widely used brazing filler metal for the multi-layer aluminum clad sheets, which act as radiator fin for aluminum heat exchanger. In this paper, 0-1.0%(mass fraction) Cu or Sn was added to 4343 alloy in order to develop a new brazing filler metal with lower melting point and better collapse resistance. The results show that with the increase of Cu or Sn, the solidus and liquidus of the alloys decrease gradually, and when the Cu or Sn content is increased to 1.0%, the solidus and liquidus will be reduced by 10-15℃ respectively. With the increase of Cu ro Sn content, the Cu bearing intermetallic phases or the Sn particles increase in the cast alloy; after hot extrusion the Cu bearing intermetallic phases dissolve and Sn particles can induce the dissolution of Fe-Si bearing intermetallic phases; the tensile strength increases gradually while the elongations decrease a little. The results of trial brazing show that the addition of Cu or Sn will decrease the brazing temperature, particularly, the brazing temperature can be reduced by more than 15℃ for the filler alloys with 1.0% of Cu or Sn.

Key words： metallic materials 4343Al alloy alloying melting point brazing

收稿日期: 2015-11-26

ZTFLH:

TB331

作者简介: 本文联系人: 董杰, 研究员

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https://www.cjmr.org/CN/10.11901/1005.3093.2015.680 或 https://www.cjmr.org/CN/Y2016/V30/I4/292

表1 设计合金的化学成分

图1 添加Cu、Sn的Al-Si合金的铸态微观组织和相

图2 添加Cu、Sn的Al-Si合金的液、固相线温度

图3 Cu和Sn的含量对Al-Si合金力学性能的影响

图4 热挤压合金的纵截面微观组织

图5 热挤压合金的纵截面SEM像和EDS分析

表2 模拟钎焊后界面结合比例

图6 模拟钎焊后界面形貌

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