Directional Solidification and Phase Stabilization
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- Insert a 100 µm chromel-alumel thermocouple (in a 0.1 cm double bore mullite protection tube) in an 8 mm outside diameter Pyrex tube. The tube length should be around 30 cm. The thermocouple tip should be coated with a boron nitride slurry.
- Form rods of the desired composition by first melting the alloy in a crucible, and drawing the molten alloy into the Pyrex tube by means of a partial vacuum. For this, use a bulb attached to the end of the Pyrex tube to suck the melt into the tube.
- Place the sample in the vertical resistance zone melting and freezing apparatus (Fig. 4). The distance between the heating element and the following chill is set at 0.5 cm.
- Run the furnace to move vertically from bottom to top. At least three directional zone melting freezing pass is suggested.
- Remove the sample from the Pyrex tube (break the tube) and polish it for microstructure characterizations. For polishing, use the three-step SiC papers (600, 800 and 1200) followed by three steps of Alumina/colloidal silica abrasive particles (3µm, 1µm and 0.05 µm).
- Analyze the microstructures using optical microscopy.
Source: Sina Shahbazmohamadi and Peiman Shahbeigi-Roodposhti-Roodposhti, School of Engineering, University of Connecticut, Storrs, CT
Directional soli…
Chapters in this video
0:07
Overview
0:50
Principles of Directional Solidification
3:19
Sample Preparation
4:15
Measurements
5:13
Sample Polishing and Analysis
6:21
Results
7:09
Applications
8:05
Summary
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