Characteristic behavior of Pt-based metallic glass under rapid heating and its application to microforming

Yasunori Saotome, Yukihisa Noguchi, Tao Zhang, Akihisa Inoue

Research output: Contribution to journalArticlepeer-review

44 Citations (Scopus)

Abstract

In this paper, we studied characteristic behavior of Pt48.75Pd9.75Cu19.5P22 metallic glass during rapid heating. We first rapidly heated a cylindrical specimen of 2mm in diameter and 5mm in height by induction heating at a rate of up to 100K/s. During the heating, glass transition temperature Tg and the crystallization temperature Tx increase with increasing heating rate. The material exhibits a Newtonian viscous flow in the supercooled liquid temperature range, and the normal viscosity decreases with increasing heating rate. The normal viscosity is 2×103Pas at a heating rate of 100K/s. We developed a new microforming system as an application of this phenomenon. The system consists of a rapid resistance-heating unit for foil specimens, a glass transition detector, a linear actuator for driving a tool, and the associated control circuits. With this apparatus, we transferred a three-dimensional micro-shape to the materials within 30s. A conventional superplastic forging system requires a long time to heat work specimens and to deform them. The developed system thus facilitates mass production of micro parts for micro electro mechanical systems (MEMS).

Original languageEnglish
Pages (from-to)389-393
Number of pages5
JournalMaterials Science and Engineering A
Volume375-377
Issue number1-2 SPEC. ISS.
DOIs
Publication statusPublished - 2004 Jul 1

Keywords

  • Amorphous alloy
  • Glass transition
  • Metallic glass
  • Microforming
  • Rapid heating
  • Viscosity

ASJC Scopus subject areas

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

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