Microstructure transformation and mechanical properties of Al alloy joints soldered with Ni-Cu foam/Sn-3.0Ag-0.5Cu (SAC305) composite solder
Microstructure transformation and mechanical properties of Al alloy joints soldered with Ni-Cu foam/Sn-3.0Ag-0.5Cu (SAC305) composite solder
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泡沫Ni-Cu/Sn-3.0Ag-0.5Cu(SAC305)复合焊料焊接铝合金接头的组织转变及力学性能
DOI：
10.1016/j.jallcom.2022.166135
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发表时间：
2022
影响因子：
6.2
通讯作者：
Xiong C
中科院分区：
文献类型：
--
作者：
Xiong C
采用不同Cu含量的Ni-Cu/SAC复合钎料作为中间层，在250 ℃下钎焊不同时间的铝合金接头。结果表明，Cu含量影响着合金组织的形成和演变。在Ni 18 Cu/SAC接头中，Sn焊料在5 min内完全消耗以形成固相接头。（Cu，Ni）6Sn 5是Sn钎料与Ni 18 Cu骨架反应生成的初始相。由于Ni 18 Cu骨架中Ni的含量高于（Cu，Ni）6Sn 5相，Ni原子从Ni 18 Cu骨架中扩散到（Cu，Ni）6Sn 5相中，取代了（Cu，Ni）6Sn 5相中的Cu原子，导致（Cu，Ni）6Sn 5相中的Ni原子含量不断增加，并在10 min时转变为（Ni，Cu）3Sn 4相。Ni 38 Cu/SAC接头也发生了相变。然而，由Sn焊料与Ni 38 Cu骨架之间的反应形成的初始相是（Ni，Cu）3Sn 4。因此，由于Cu原子从Ni 38 Cu骨架扩散到（Ni，Cu）3Sn 4中，（Ni，Cu）3Sn 4相在10 min时转变为（Cu，Ni）6Sn 5。随着钎焊时间的延长，接头的剪切强度先增大后减小，钎焊10 min的Ni 18 Cu/SAC接头剪切强度最高，为58.3 MPa，剪切破坏主要发生在复合钎料层中。
In this study, Ni-Cu/SAC composite solders with different Cu contents were used as an interlayer to solder Al alloy joints at 250 ℃ for different time. The results showed that the formation and evolution of the microstructure were affected by the Cu contents. In the Ni18Cu/SAC joint, the Sn solder was completely consumed to form a solid-phase joint in 5 min. And (Cu,Ni)6Sn5was the initial phase formed from the reaction between Sn solder and the Ni18Cu skeleton. Due to the higher Ni concentration than (Cu,Ni)6Sn5phase in the Ni18Cu skeleton, the Ni atoms diffused from Ni18Cu skeleton to the (Cu,Ni)6Sn5phase and replaced the Cu atoms in it. As a result, the content of Ni atoms in (Cu,Ni)6Sn5phase increased continuously, and transformed into (Ni,Cu)3Sn4at 10 min. Phase transition also occurred in the Ni38Cu/SAC joints. However, the initial phase formed from the reaction between Sn solder and the Ni38Cu skeleton was (Ni,Cu)3Sn4. Therefore, the (Ni,Cu)3Sn4phase was transformed into (Cu,Ni)6Sn5at 10 min because the Cu atoms diffused from Ni38Cu skeleton to (Ni,Cu)3Sn4. On increasing the soldering time, the shear strength of the joints first increased and then decreased, the Ni18Cu/SAC joints soldered for 10 min exhibited the highest shear strength of 58.3 MPa, the shearing failure mainly happened in the composite solder layers.