本研究將兩種不同厚度的Sn-xZn(x=1、5、9、20與40 wt%)銲料分別與Au及Cu兩種常見的導線材製做成三明治反應偶，於160oC下進行20至1000小時的界面反應。
結果顯示，在Sn-1Zn系統中，與Au端反應後界面主要生成Au-Sn二元系統的介金屬相，並且Cu原子會擴散至Au端反應生成Cu6Sn5相；當Zn含量增加至20與40 wt%後，界面則是以Au-Zn二元相為主。然而在Sn-5Zn/Au與Sn-9Zn/Au反應偶中，因為存在Zn含量分布不均的情況，故在界面處會同時觀察到有Au-Sn與Au-Zn兩種系統的相生成以及一個Au-Sn-Zn三元介穩相。
而與Cu端反應的結果中，只有Sn-1Zn/Cu反應偶界面有CuZn及Cu6Sn5相生成，當Zn含量增加後，界面則轉變成以Cu5Zn8相為主。當時效效時間增長後，Sn-xZn/Au反應偶之介金屬相也隨之變厚，且在Zn含量小於20 wt%的系統中，可發現Cu原子會逐漸固溶入介金屬相中。Sn-xZn/Cu反應偶的部分則是隨時效時間增長，Cu5Zn8相會有明顯的熟化現象。當銲料厚度變厚時，會使Cu原子擴散至Au端的情況變慢，但並無造成生成相的轉變，而是僅有固溶入介金屬相的時間點不同。

In this study, the Sn-xZn solders (x=1, 5, 9, 20 and 40 wt%) with two kinds of thickness and the Au and Cu metals were prepared to form sandwich reaction couples then aged at 160oC for 20 to 1000 h.
The results showed that the Au-Sn binary phases were form at the Sn-1Zn/Au interface and Cu diffused to the Au side to form Cu6Sn5 phase. When the Zn content increased to 20 and 40 wt%, there were Au-Zn binary phases form at the interface. But the Sn-5Zn/Au and Sn-9Zn/Au couples, there were Au-Sn, Au-Zn binary phases and also a Au-Sn-Zn ternary metastable phase form at the interface simultaneously.
To react with Cu substrate, the CuZn and Cu6Sn5 phases were found at the Sn-1Zn/Cu couple. And the IMC transformed into Cu5Zn8 phase when the Zn content increased. When aged for a long time, the IMCs became thicker than before. Besides, the Cu dissolves into the IMCs when Zn content less than 20 wt%. At the Sn-xZn/Cu reaction couples, there were significantly ripening phenomenon at the Cu5Zn8 phase with increasing of the aging time. And the diffusion rate of Cu was decreased with increasing the thickness of solders. This did not cause any phase transitions, but the Cu would dissolved into the IMCs at different aging times.

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