In situ X-ray study of order-disorder phase transitions in Cu-Al-Be melt spun ribbons

The disorder–order phase transitions in Cu–Al–Be shape memory alloys were studied by in-situ X-ray diffraction. Isothermal measurements in an inert gas chamber were made on ribbons of Cu–Al–Be alloys, obtained by melt spinning. A position sensitive detector was used for a fast record of the X-ray si...

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Bibliographic Details
Published in:Journal of materials science 2006-08, Vol.41 (15), p.4755-4758
Main Authors: OCHOA-LARA, M. T, FLORES-ZUNIGA, H, RIOS-JARA, D, LARA-RODRIGUEZ, G
Format: Article
Language:English
Subjects:
Applied sciences
Beta phase
Copper
Copper base alloys
Exact sciences and technology
Heating
High temperature
Materials science
Melt spinning
Melt spun
Metals. Metallurgy
Order disorder
Phase transformations
Phase transitions
Position sensing
Rare gases
Ribbons
Sample holders
Shape memory alloys
Thermocouples
X-rays
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Summary:The disorder–order phase transitions in Cu–Al–Be shape memory alloys were studied by in-situ X-ray diffraction. Isothermal measurements in an inert gas chamber were made on ribbons of Cu–Al–Be alloys, obtained by melt spinning. A position sensitive detector was used for a fast record of the X-ray signal on a θ–θ geometry diffractometer. Each ribbon was used as the heating element, avoiding the need of a heating sample holder and obtaining a better measurement of the temperature with a thermocouple attached directly to the ribbon. The order transition was followed at different temperatures after a high temperature annealing (700 °C) in the disordered β-phase region. A first order transition was observed from disordered β (A2) to ordered β1 (DO3), without prior β (B2) ordering. No precipitation was detected during this fast measuring procedure.
ISSN:0022-2461
1573-4803
DOI:10.1007/s10853-006-0026-7