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자료유형
학술저널
저자정보
Jeonga Kim (Pusan National University) Cheolho Park (Pusan National University) Kyung-Mox Cho (Pusan National University) Won Sik Hong (Korea Electronics Technology Institute) Jung-Hwan Bang (Korea Institute of Industrial Technology) 고용호 (한국생산기술연구원 용접접합기술센터) Namhyun Kang (Pusan National University)
저널정보
대한금속·재료학회 Electronic Materials Letters Electronic Materials Letters Vol.14 No.6
발행연도
2018.1
수록면
678 - 688 (11page)

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The repeated-bending properties of Sn–0.7Cu, Sn–0.3Ag–0.7Cu (SAC0307), and Sn–3.0Ag–0.5Cu (SAC305) soldersmounted on fl exible substrates were studied using highly accelerated stress testing (HAST), followed by repeated-bendingtesting. In the Sn–0.7Cu joints, the Cu 6 Sn 5 intermetallic compound (IMC) coarsened as the HAST time increased. For theSAC0307 and SAC305 joints, the Ag 3 Sn and Cu 6 Sn 5 IMCs coarsened mainly along the grain boundary as the HAST timeincreased. The Sn–0.7Cu solder had a high contact angle, compared to the SAC0307 and SAC305 solders; consequently, theSAC0307 and SAC305 solder joints displayed smoother fi llet shapes than the Sn–0.7Cu solder joint. The repeated-bendingfor the Sn–0.7Cu solder produced the crack initiated from the interface between the Cu lead wire and the solder, and thatfor the SAC solders indicated the cracks initiated at the surface, but away from the interface between the Cu lead wire andthe solder. Furthermore, the oxide layer was thickest for Sn–0.7Cu and thinnest for SAC305, regardless of the HAST time. For the SAC solders, the crack initiation rate increased as the oxide layer thickened and roughened. Cu 6 Sn 5 precipitatedand grew along the grain and subgrain boundaries as the HAST time increased, embrittling the grain boundary at the crackpropagation site.

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