TY - JOUR
T1 - Early stage soldering reaction and interfacial microstructure formed between molten Sn-Zn-Ag solder and Cu substrate
AU - Yu, Chang Ho
AU - Lin, Kwang Lung
N1 - Funding Information:
The authors acknowledge the National Science Council of the Republic of China for the financial support of this study under Grant No. NSC93-2216-E-006-011.
Copyright:
Copyright 2008 Elsevier B.V., All rights reserved.
PY - 2005/5
Y1 - 2005/5
N2 - The soldering reaction and interfacial microstructure formed between liquid Sn-Zn-Ag solder and Cu at the early stage of soldering at 250 °C for 15 s were studied primarily with the aid of transmission electron microscope (TEM). To achieve the early stage reaction information, the soldered specimens, 5 mm × 5 mm × 500 μm solder on 10 mm × 10 mm × 20 μm Cu, were rapidly quenched in liquid nitrogen after soldering. The results of TEM interfacial analysis show that a Cu-Zn reaction zone, consisting of β′-CuZn and γ-Cu5Zn8, formed near Cu while a Ag-Zn zone, consisting of γ-Ag5Zn8 and ∈-AgZn3, formed near solder. The innermost layer adjacent to the Cu substrate is an amorphous Cu-Zn diffusion region that contains dispersed β′-CuZn nanocrystalline cells. The β′-CuZn also precipitates in the γ-Ag5Zn8 and ∈-AgZn3 layer due to the supersaturation of Cu.
AB - The soldering reaction and interfacial microstructure formed between liquid Sn-Zn-Ag solder and Cu at the early stage of soldering at 250 °C for 15 s were studied primarily with the aid of transmission electron microscope (TEM). To achieve the early stage reaction information, the soldered specimens, 5 mm × 5 mm × 500 μm solder on 10 mm × 10 mm × 20 μm Cu, were rapidly quenched in liquid nitrogen after soldering. The results of TEM interfacial analysis show that a Cu-Zn reaction zone, consisting of β′-CuZn and γ-Cu5Zn8, formed near Cu while a Ag-Zn zone, consisting of γ-Ag5Zn8 and ∈-AgZn3, formed near solder. The innermost layer adjacent to the Cu substrate is an amorphous Cu-Zn diffusion region that contains dispersed β′-CuZn nanocrystalline cells. The β′-CuZn also precipitates in the γ-Ag5Zn8 and ∈-AgZn3 layer due to the supersaturation of Cu.
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U2 - 10.1557/JMR.2005.0155
DO - 10.1557/JMR.2005.0155
M3 - Article
AN - SCOPUS:25444442912
VL - 20
SP - 1242
EP - 1249
JO - Journal of Materials Research
JF - Journal of Materials Research
SN - 0884-2914
IS - 5
ER -