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 language | English |
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Pages (from-to) | 389-393 |
Number of pages | 5 |
Journal | Materials Science and Engineering A |
Volume | 375-377 |
Issue number | 1-2 SPEC. ISS. |
DOIs | |
Publication status | Published - 2004 Jul |
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