Microstructure, electric flame-off (EFO) characteristics and tensile properties of silver-lanthanum alloy wire

Hao Wen Hsueh, Fei Yi Hung, Truan Sheng Lui, Li Hui Chen, Jun Kai Chang

Research output: Contribution to journalArticlepeer-review

20 Citations (Scopus)


Silver has potential for application in the electronic packaging industry because of its great electrical and thermal properties and lower price compared to that of gold. Silver oxidizes easily, so doping lanthanum to form Ag-La alloy improves its anti-oxidation capacity. In this study, the microstructure, tensile properties, electronic flame-off (EFO) characteristics, and fusing current of Ag-La alloy wire (φ = 20 μm) are studied. Samples annealed at three temperatures (325 °C, 375 °C, and 425 °C) are analyzed. According to the experimental results, after annealing at 425 °C, Ag-La alloy wire recrystallized, giving it a tensile strength similar to that of pure silver wire and a uniform structure. Doping lanthanum reduced the diameter of free air balls (FABs) in the EFO process. The fusing current of Ag-La wire was about 0.45 A, and the grains of Ag-La wire grew to the size of the wire diameter when a 0.4 A current (90% fusing current) was applied for a long time. Ag-La alloy wire can be used in the electronic packaging industry.

Original languageEnglish
Pages (from-to)2564-2569
Number of pages6
JournalMicroelectronics Reliability
Issue number11
Publication statusPublished - 2014 Nov 1

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Atomic and Molecular Physics, and Optics
  • Condensed Matter Physics
  • Safety, Risk, Reliability and Quality
  • Surfaces, Coatings and Films
  • Electrical and Electronic Engineering


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