为保证锡银铜合金及焊点在低温环境下使用可靠性,将SnAg3.0Cu0.5合金焊料和焊点在25、4、-20和-60℃恒温环境中进行储存565 d后,考察不同温度下SnAg3.0Cu0.5无铅焊料微观组织和物相变化,对经冷储存后SnAg3.0Cu0.5/Cu焊接接头进行拉伸强度和低周疲劳测试.结果表明,焊料经低温储存后没有发生灰锡转变,合金主要由Ag3Sn和β-Sn组成,组织形貌转变为树枝状组织,排列具有一定取向,β-Sn相晶面间距变小,焊料出现低温脆性倾向;随储存温度降低,SnAg3.0Cu0.5焊料与Cu基板互连结构的断裂界面从焊料侧向铜基体方向移动,焊缝的抗拉强度随之下降;在恒幅对称应变条件下,疲劳极限-循环次数曲线的斜率随焊件储存温度降低而变大,焊接接口的抗疲劳性能变差.
参考文献
| [1] | Jian-Xin Wang;Song-Bai Xue;Zong-Jie Han .Effects of rare earth Ce on microstructures, solderability of Sn-Ag-Cu and Sn-Cu-Ni solders as well as mechanical properties of soldered joints[J].Journal of Alloys and Compounds: An Interdisciplinary Journal of Materials Science and Solid-state Chemistry and Physics,2009(1/2):219-226. |
| [2] | 吴茂,何新波,孟菲菲,曲选辉.磷含量对Sn-2.5Ag-2.0Ni/Ni（P）钎焊接头组织及剪切强度的影响[J].材料热处理学报,2009(04):34-38,43. |
| [3] | 王应良.高速铁路钢桥的低温脆性断裂评估[J].中国铁道科学,2012(03):28-34. |
| [4] | A. Eckert .Organ pipes and tin pest[J].Materials and Corrosion,2008(3):254-260. |
| [5] | 郑修麟.工程材料的力学行为[M].西安:西北工业大学出版社,2004 |
| [6] | Chiavari C;Martini C;Poli G;Prandstraller D .Deterioration of tin-rich organ pipes[J].Journal of Materials Science,2006(6):1819-1826. |
| [7] | Di Maio D;Hunt C P .Monitoring the growth of the α-phase in tin alloys by electrical resistance measurements[J].Journal of Electronic Materials,2009,38(09):1874-1880. |
| [8] | An Investigation Of Sn Pest In Pure Sn And Sn-based Solders[J].Microelectronics and reliability,2009(1):86. |
| [9] | S. Gialanella;F. Deflorian;F. Girardi .Kinetics and microstructural aspects of the allotropic transition in tin[J].Journal of Alloys and Compounds: An Interdisciplinary Journal of Materials Science and Solid-state Chemistry and Physics,2009(1/2):134-139. |
| [10] | LU Bin,LI Hui,WANG Juan-hui,ZHU Hua-wei,JIAO Xian-he.Effect of adding Ce on interfacial reactions between Sn-3.0Ag-0.5Cu solder and Cu substrate[J].中南工业大学学报（英文版）,2008(03):313-317. |
| [11] | Hegde, P;Whalley, DC;Silberschmidt, VV .Creep damage study at powercycling of lead-free surface mount device[J].Computational Materials Science,2009(3):638-645. |
上一张
下一张
上一张
下一张
计量
- 下载量()
- 访问量()
文章评分
- 您的评分：
-
10%
-
20%
-
30%
-
40%
-
50%