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SnBi/Cu界面Bi偏聚机制与时效脆性抑制 被引量:8

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摘要 长期时效的SnBi/Cu界面出现的Bi偏聚导致的界面脆性大大限制了Sn-58Bi低温无铅焊料的使用,因此有必要在理解其产生机制的基础上研究抑制界面Bi偏聚及时效脆性的方法.本文首先根据SnBi/Cu焊接界面在液态反应(回流焊接)和固态时效过程中的Bi偏聚行为讨论了偏聚形成的机制,而后阐述了Cu基体合金化和回流温度对Bi偏聚行为的影响,并讨论了合金化抑制Bi偏聚的微观机制.此外还比较了SnBi/Cu和SnBi/Cu-X焊接接头的拉伸、疲劳性能和断裂行为,证明了在消除界面Bi偏聚之后SnBi/Cu界面在拉伸和疲劳载荷下均不会出现脆性断裂,最后基于以上理解提出了消除界面脆性的新工艺方法.
出处 《中国科学:技术科学》 CSCD 北大核心 2012年第1期13-21,共9页 Scientia Sinica(Technologica)
基金 国家重点基础研究发展规划资助项目(“973”计划)(批准号:2010CB631006)
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参考文献27

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同被引文献55

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