Size effect on tensile strength of surface-micromachined Al-3%Ti thin films

Jun Hyub Park, Man Sik Myung, Yun Jae Kim, Chang Seung Lee, Sung Hoon Choa, Woo Seong Che

Research output: Contribution to journalArticle

2 Citations (Scopus)

Abstract

A new tensile tester using an electromagnetic-force actuator (voice coil) was developed to measure the mechanical characteristics of surface-micromachined thin film materials. The tester has a load cell with maximum capacity of 0.5N and a non-contact position measuring system based on the principle of capacitance micrometry with 0.1 nm resolution for displacement measurement. The tester was applied for tensile testing of Al-3%Ti thin films with dimensions of 1000μm long, 50-480μm wide and 1.0 and 1.1 μm thick. The Al-3%Ti is commonly used in RF(radio frequency) microelectromechanical systems(MEMS) switch. The specimen with holes and bridges was designed for easy tensile test. The holes at center of grip end are able to make alignment and gripping easy. The bridges are to remove the side supports easily and extract specimen from wafer without sawing. It was found that the mean tensile strengths of Al-3%Ti are 140-380MPa, depending on the width of specimens and converging to a certain tensile strength as the width decreases.

Original languageEnglish
Pages (from-to)313-316
Number of pages4
JournalKey Engineering Materials
Volume326-328 I
DOIs
Publication statusPublished - 2006

Keywords

  • Mechanical properties
  • RF MEMS Switch
  • Size effect
  • Tensile loading
  • Thin film

ASJC Scopus subject areas

  • Materials Science(all)
  • Mechanics of Materials
  • Mechanical Engineering

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