本研究將探討Cu含量對Sn-Ag-xCu(x=0～1.5wt%)無鉛銲錫合金之機械性質的影響，著重振動破壞特性方面。主要內容為Cu含量及振動測試條件對振動破壞特性，包括制振性及裂縫傳播的影響。
在微觀組織及拉伸測試方面，隨著Cu含量的增加，樹枝狀初晶Sn逐漸變細，並且在高Cu組成試片觀察到Cu6Sn5的晶出，此外抗拉強度及降伏強度亦隨之增加。
對數衰減率測試結果顯示，制振性的大小順序為：1.5CU>0.0Cu>0.5Cu>1.0Cu。此現象導致在固定出力值之振動測試條件下，起始偏移量大小順序為：1.0Cu>0.5Cu>0.0Cu>1.5Cu，且共振壽命的順序恰與起始偏移量相反，此結果顯示固定出力值時之振動壽命與制振性有密切關係。而在固定起始偏移量條件振動測試之實驗結果顯示，振動壽命隨著Cu含量的增加而增加，與試片變形阻抗(降伏強度)成正比。
觀察經過振動測試的各組試片表面發現樹枝狀初晶Sn產生層狀變形，且於高含Cu量的試片中晶出的Cu6Sn5在振動特性及裂縫傳播過程中均扮演重要的角色。

This study focused on the mechanical properties of Sn-Ag-xCu (x=0~1.5wt%), particularly the resonant vibration fracture behaviors. The main issues of this study were the effects of Cu content and vibration testing conditions on the resonant vibration properties, including damping capacity and rack growth.
Adding Cu will refine the β-Sn dendrites. Massive Cu6Sn5 compound particles appeared in the specimens with the Cu content higher than 1.0wt%. As for the results of tensile tests, the strength is getting higher with increasing Cu content.
The results also show that the logarithmic decrement of the specimens in a decreasing order is 1.5Cu, 0.0Cu, 0.5Cu, 1.0Cu. It could be also found that under constant vibration force conditions, the specimen with a higher damping capacity possesses a lower initial deflection and the greater vibration life. On the other hand, results of vibration tests with the settled initial deflection showed that vibration life increased with a higher Cu content. It is closely related to the plastic deformation resistance (yield strength).
The striated deformation feature can only be found in the Sn-rich dendrites, and the Cu6Sn5 which appeared in the higher Cu specimens plays an important role in absorbing vibration energy and crack propagating.

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