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首页> 外文期刊>Journal of Materials Engineering and Performance >Effect of the Soldering Process on the Microstructure and Mechanical Properties of Sn-9Zn/Al Solder Joints
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Effect of the Soldering Process on the Microstructure and Mechanical Properties of Sn-9Zn/Al Solder Joints

机译：焊接工艺对Sn-9Zn / Al焊点组织和力学性能的影响

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摘要

Tin-zinc solder alloys are considered to be appropriate for soldering of aluminum alloys at low-temperature in electronics and radiators applications. In this paper, the effects of different soldering parameters on the microstructure and interfacial reaction behaviors of 1070Al/Sn-9Zn/1070Al joints were investigated. The results show that the Al substrate was dissolved by the liquid solder, but Al-related intermetallic was not observed in the interface. Two kinds of Al-rich phases formed in the solder matrix. Large butterfly-shaped solid solution (Al)aEuro(3) phases (about 10 mu m) were formed in the liquid alloys, and compact-shaped precipitations (nano-size) were dissolved out from solders during solidification process. With increasing of the soldering time, AlaEuro(3) phases were migrated upwards in the solders and the amount of this phase increased. In addition, with the increase of the soldering temperature, the dissolution rate of Al into the solder increased and the formation time of (Al)aEuro(3) phases was reduced. Shear test results indicate when soldered at 250 A degrees C, the shear strength increased from 48.6 MPa to a maximum 60.5 MPa and then decreased to a stable value (about 55 MPa) with increasing of the soldering time. Similar trends were also observed at 300 and 350 A degrees C, while the soldering time needed to obtain maximum shear strength was shortened. The formation of these Al-rich phases improves the shear strength but deteriorates the ductility.
机译：锡锌焊料合金被认为适用于在电子和散热器应用中低温焊接铝合金。本文研究了不同焊接参数对1070Al / Sn-9Zn / 1070Al接头组织和界面反应行为的影响。结果表明，Al基体被液态焊料溶解，但在界面中未观察到Al相关的金属间化合物。焊料基质中形成了两种富铝相。在液态合金中形成了大的蝴蝶状固溶体（Al）aEuro（3）相（约10μm），并且在凝固过程中从焊料中析出了紧凑形的沉淀物（纳米尺寸）。随着焊接时间的增加，AlaEuro（3）相在焊料中向上迁移，并且该相的数量增加。另外，随着焊接温度的升高，Al在焊料中的溶解速率增加，（Al）aEuro（3）相的形成时间减少。剪切测试结果表明，在250 A的温度下焊接时，随着焊接时间的增加，剪切强度从48.6 MPa增加到最大60.5 MPa，然后下降到稳定值（约55 MPa）。在300和350 A的温度下也观察到类似的趋势，同时缩短了获得最大剪切强度所需的焊接时间。这些富铝相的形成改善了剪切强度，但延展了延展性。

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