本研究探討銅元素的添加(0.1, 0.3, 0.5, 1, 1.5 wt%)對Zn-25Sn合金微結構、熱性質及機械性質之影響；微結構觀察結果顯示，合金中包含富鋅相(η-Zn)、富錫相(β-Sn)及針棒狀錫鋅共晶組織，所添加之銅元素大多散佈在富鋅相中，當銅元素添加量≦0.3 wt%時，具有使富鋅相尺寸細化的效果，當銅元素添加量≧0.5 wt%時，合金中會生成ε-CuZn5介金屬化合物；熱性質量測結果顯示，隨著銅元素添加量的增加，合金液相線溫度有上升的趨勢，但對於合金固相線溫度及過冷度並無太大的影響；硬度量測結果顯示，隨著銅元素添加量的增加，合金硬度有上升的趨勢，當銅元素添加量為1.5 wt%時，合金硬度達最大值60.1 Hv；常溫拉伸試驗結果顯示，隨著銅元素添加量的增加，合金強度有上升的趨勢，延展性則有下降的趨勢，當銅元素添加量為1 wt%時，合金強度達最大值72.5 MPa；高溫拉伸試驗結果顯示，當合金在高溫環境(100℃)下進行拉伸試驗時，與常溫拉伸性質相比較，合金強度皆下降，延展性則皆上升，而隨著銅元素添加量的增加，其趨勢與常溫拉伸試驗結果相同，當銅元素添加量為1 wt%時，合金強度達最大值38.9 MPa。

This study investigated the effect of different Cu addition on microstructure, thermal properties, and mechanical properties of Zn-25Sn solder alloys.
The microstructure observation shows that the alloys consist of η-Zn phase, β-Sn phase and eutectic structure. The Cu added distributed across the η-Zn phase. As the amount of Cu addition is less than or equal to 0.3 wt%, the size of η-Zn phase will decrease. As the amount of Cu addition is greater than or equal to 0.5 wt%, ε-CuZn5 intermetallic compounds were formed in alloys. The results of differential scanning calorimetry indicate that the liquidus temperature of alloys increase with increasing Cu addition. Nevertheless, the addition of Cu exhibits little effects on solidus temperature and undercooling of alloys. The measure of microhardness testing show that the microhardness of alloys increase with increasing Cu addition. The maximum microhardness (60.1 Hv) occurs with 1.5 wt% Cu addition. The results of tensile testing at room temperature indicate that the tensile strength of alloys increase with increasing Cu addition; on the other hand, the elongation of alloys decreases with increasing Cu addition. The maximum ultimate tensile strength (72.5 Mpa) occurs with 1 wt% Cu addition. The results of tensile testing at 100℃ indicate that the tensile strength of alloys increase with increasings Cu addition, while the elongation of alloys decreases with increasing Cu addition. The maximum ultimate tensile strength (38.9 MPa) occurs with 1 wt% Cu addition.

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