The role of eutectic phase and acicular primary crystallized Zn phase on electrification-fusion induced fracture of Sn-xZn solder alloys

Gong An Lan, Truan-Sheng Lui, Li Hui Chen

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2 Citations (Scopus)

Abstract

Effect of Sn-xZn solder alloys with varying eutectic phase and acicular primary crystallized Zn phase on the electrification-fusion induced liquidation phenomenon was investigated in this study. The critical fusion current density (CFCD) for liquidation fracture tends to increase with increasing Zn content, the CFCD value required for electrification-fusion induced liquidation are 1457 (×104)A·m· 2 (7Zn), 1504 (×104)A·m· 2 (30Zn) and 2195 (×104)A·m· 2 (70Zn) respectively, which are commonly larger than pure tin (1399 (×104) A·m·2) pertaining to the transformation of current path. Through the in-situ examination of microstructural evolution during electrification-fusion tests, the initial site of electrification-fusion-induced liquidation significantly emerged from Sn/Zn eutectic phase. From the experimental evidences, it should be noted that the pure Sn specimen showing a character that the initiation site for microliquidation were located at the triple junction of electrification induced current path, whereas the Sn-Zn alloy specimens were commonly initiated from the eutectic phase pertaining to the higher conductivity of acicular Zn phase.

Original languageEnglish
Pages (from-to)2111-2118
Number of pages8
JournalMaterials Transactions
Volume52
Issue number11
DOIs
Publication statusPublished - 2011 Nov 11

All Science Journal Classification (ASJC) codes

  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering

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