Bi含量對Cu/Sn-0.3Ag-0.7Cu/ Cu微焊點蠕變性能的影響Bi含量對Cu/Sn-0.3Ag-0.7Cu/ Cu微焊點蠕變性能的影響Effect of Bi content on creep properties of Cu/Sn-0.3Ag-0.7Cu/ Cu solder joints 采用光學顯微鏡、電子顯微鏡和動態力學分析等方法研究Bi含量對直徑為400 μm、高度為200 μm的無鉛Cu/Sn-0.3Ag-0.7Cu(SAC0307)/Cu微尺度焊點的顯微組織及蠕變性能的影響。結果表明：當焊點中Bi含量較低(1%(質量分數))時，其基體組織細小，Cu6Sn5為粗大塊狀，Ag3Sn分布不均勻；當焊點中Bi含量較多(3%(質量分數))時，基體組織與Cu6Sn5進一步細化，Ag3Sn在細化的同時分布更均勻，界面扇貝狀IMC層更平直。另外，溫度為80~125 ℃、應力為8~15 MPa條件下，拉伸蠕變試驗得到SAC0307微焊點的蠕變激活能(Q)和蠕變應力指數(n)分別為82.9 kJ/mol和4.35；當釬料中Bi含量由1.0%增加到3.0%時，焊點的Q值從89.2 kJ/mol增加到94.6 kJ/mol，n值由4.48增加到4.73，釬焊接頭的抗蠕變能力明顯提高，所有焊點的蠕變變形機制主要受位錯攀移控制。 The microstructure and creep properties of Bi-doped Cu/Sn-0.3Ag-0.7Cu (SAC0307)/Cu micro-scale solder joints with diameter of 400 μm and height of 200 μm were investigated by optical microscope, scanning electron microscope and dynamic mechanical analysis method. The results show that adding 1% (mass fraction) Bi element into SAC0307 solder leads to the microstructural refinement, larger block of Cu6Sn5, non-uniform distribution of Ag3Sn and small primary β-Sn grains. While the SAC0307-3Bi solder joints contain relatively smaller sizes of primary β-Sn grains, also the IMCs appear much smaller than the examined joints with low Bi content. The IMC layer at the solder/Cu interface changes from a large up-and-down scallop shape to the straight one. In addition, the creep property of micro-scale solder joints was studied under 80-125 ℃ and 8-15 MPa. The activation energy (Q) of solder joints increase from 82.9 kJ/mol to 94.6 kJ/mol, the stress exponent (n) increases from 4.48 to 4.73 when Bi content increases from 1.0% to 3.0% (mass fraction), which indicates the increasing trends of the creep resistance and dominant deformation mechanism of dislocation climb. 全文下載：https://pan.baidu.com/s/1gg3JgGj? 作為值得信賴的合作伙伴和高品質金屬合金的半成品供應商，通項公司擁有完善的服務體系和專業的團隊。在同客戶交易的過程中，我們力求根據不同的應用需求將我們的產品做到精益求精。針對當前和未來的市場需求，通項公司致力于為客戶提供最佳的金屬材料解決方案。 TXCO has been a reliable partner and supplier of sophisticated and high-quality semi-finished products maed of alloys. In dialogue with our customers, we optimise our products to meet the specific application requirements. TXCO develops the best alloy material solutions for current and future challenges. 獲取更多我們供應的產品和服務信息，請致電086-021-6786 0205或發電子郵件service@sinoav.com聯系我們，您也可以通過微信，微博，領英，臉書，推特和谷歌+與我們互動。 For more information on the products and services that we supply, call us at 086-021-6786 0205 or email us at service@sinoav.com. You can also get in touch on social media, we are constantly active on Weixin, Weibo, LinkedIn, Facebook, Twitter and Google+.
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