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Electric pulse heating device for the analysis of solid/solid phase transformations.

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Summary
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A novel Ohmic pulse heating device enables precise study of solid-state phase transformations. This setup accurately measures local temperatures during rapid heating and cooling, revealing distinct phase transformation mechanisms.

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Area of Science:

  • Materials Science
  • Solid-State Physics
  • Physical Chemistry

Background:

  • Solid-state phase transformations are crucial in materials processing.
  • Existing methods for studying these transformations face limitations in temperature measurement and control.
  • Understanding diffusion and interface-controlled mechanisms requires precise experimental conditions.

Purpose of the Study:

  • To develop and demonstrate a novel Ohmic pulse heating device for investigating solid-state phase transformations.
  • To overcome limitations of existing setups regarding temperature measurement and sample geometry.
  • To enable the study of rapid heating and cooling effects on material microstructures.

Main Methods:

  • Utilized a high-current, low-voltage Ohmic pulse heating setup powered by a capacitor array.
  • Employed microcontrollers and a solid-state relay for precise pulse control (microsecond adjustable).
  • Captured high-resolution infrared temperature data at 1200 fps, synchronized with electrical measurements.

Main Results:

  • Demonstrated rapid heating rates up to 10^6 K/s on a brass sample.
  • Observed distinct cooling curves in different sample areas, with rates of 10^4 K/s and 10^2 K/s.
  • Correlated microstructural analysis with varied cooling rates, indicating different dominant phase transformation mechanisms.

Conclusions:

  • The developed Ohmic pulse heating device effectively facilitates the investigation of diffusion and interface-controlled solid-state phase transformations.
  • The setup's capability to precisely control heating/cooling and measure local temperatures allows for detailed analysis of phase evolution.
  • This technology provides a valuable tool for understanding materials behavior under extreme thermal conditions.