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標題: Alloying modification of Sn-Ag-Cu solders by manganese and titanium
作者: Lin, L.W.
Song, J.M.
Lai, Y.S.
Chiu, Y.T.
Lee, N.C.
Uan, J.Y.
關鍵字: vibration fracture properties;joints;microstructure;substrate;ag3sn
Project: Microelectronics Reliability
期刊/報告no:: Microelectronics Reliability, Volume 49, Issue 3, Page(s) 235-241.
Effects of Mn and Ti additives on the microstructure and solidification behavior of Sn-1.0Ag-0.5Cu alloys (SAC105), as well as mechanical properties, were investigated in this study. Results show that alloying of Mn and Ti resulted in dramatically reduced undercooling, coarse eutectic structure and extended volume fraction of proeutectic Sn of which the dendritic size was refined. Those thermal and microstructural changes might be ascribed to the formation of MnSn(2) and Ti(2)Sn(3) intermetallic compounds (IMCs) which appeared respectively in the Mn-doped and Ti-doped samples. Nanoindentation tests demonstrated that the heterogeneous IMCs produced by alloying were harder and stiffer than the inherent IMCs, Ag(3)Sn and Cu(6)Sn(5). Worthy of notice is that the elastic modulus of SAC105 alloys decreased with only a minor alloying addition due to the shrunken eutectic regions and coarsened eutectic microconstituents. With a larger quantity of additives, an ascending elastic modulus could be obtained because of the strengthening effect by hard heterogeneous compounds. (C) 2008 Elsevier Ltd. All rights reserved.
ISSN: 0026-2714
DOI: 10.1016/j.microrel.2008.10.001
Appears in Collections:材料科學與工程學系

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