本篇論文對Sn-Zn合金與Au基材於160oC下反應6-800小時的固/固界面反應進行研究，實驗結果可分為兩種界面系統。Sn-1Zn/Au反應偶的界面反應與Au/Sn之界面反應系統相似，Zn含量小於1 wt.%不足以影響界面反應之生成相；Sn-3Zn/Au反應偶大部分與Sn-1Zn/Au之界面形態相似，由於Zn濃度分布不均，在界面會生成少部分Au、Sn與Zn比例為1：1：1的三元相。Zn含量小於3 wt.%界面反應皆屬於Au-Sn之反應系統。Sn-5Zn/Au反應偶有兩種界面形態，因為Zn濃度增加到5 wt.%仍然是有分布不均的問題，隨著時效時間增加，可觀察出此反應偶即為Au-Sn與Au-Zn反應系統之分界。當合金中的Zn濃度增加到7 wt.%以上，界面形態則完全轉變為Au-Zn之反應系統，不會再出現Au-Sn之二元相，這與兩者之生成自由能有密切的關係。
各組反應偶之IMC的厚度隨時間增加而增加，Sn-xZn (x=1, 3, 5 wt.%)三組反應偶之n值約在0.25-0.33之間，反應機制遵守晶界控制；Sn-xZn (x=7, 9, 12, 15 wt.%)四組反應偶呈兩段式的線性成長，在144小時前反應同樣受晶界控制，但在144小時後受Zn濃度的影響，導致反應速率下降；Sn-50Zn/Au反應偶之n值略等於0.5，反應機制為擴散控制，而Sn-90Zn/Au反應偶之n值下降至0.19，反應速率緩慢。另外，Zn含量的增加會造成Au-Sn系統反應速率下降，Au-Zn系統之反應速率上升。最後將反應偶於160oC界面反應路徑的結果描繪在Au-Sn-Zn等溫橫截面圖中，隨著Zn濃度增加，路徑由相圖之左側慢慢移動到相圖之右側，再次說明了Zn的添加，造成界面由Au-Sn反應系統轉變為Au-Zn反應系統，確實對界面反應有很大之影響。

This study investigated the interfacial reaction of Sn-Zn alloy and Au substrate which aging at 160oC for 6-800 hours. There are two kinds of reaction systems in the results of experiment. The interfacial reaction belong to Au-Sn reaction system when the Zn content in the Sn-Zn alloy was less than 3 wt.% and observed a Au-Sn-Zn ternary phase in Sn-3Zn/Au reaction couple. Because of Zn content inhomogeneously and insufficiently in Sn-5Zn/Au couple, it will induce two types of interfacial formation. This reaction couple divided the Au-Sn and Au-Zn reaction system. Increase Zn content more than 7 wt.%, the interfacial formation completely transfer to Au-Zn reaction system. IMC thickness become thicker by increasing of the aging time in all of the reaction couple. The n value of Sn-xZn/Au (x=1, 3, 5 wt.%) couples were between 0.25-0.33, which is grain boundary-controlled. Sn-xZn/Au (x=7, 9, 12, 15 wt.%) couples also have the same condition before 144 hours. But Zn will consumed after 144 hours and reduced the reaction rate. The n value of Sn-50Zn/Au couple was 0.5, which is affected by diffusion-controlled. And the n value of Sn-50Zn/Au couple was 0.19. In conclusion, Zn addition will reduce the reaction rate of Au-Sn system and increase the reaction rate of Au-Zn system. In addition, using the results of interfacial reaction to illustrated the reaction path on Au-Sn-Zn isothermal section. With increasing of the Zn concentration, reaction path will change from left side (Au-Sn side) to right side (Au-Zn side).

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