Temperature Dependence of the Elastic Modulus of (Ni0.6Nb0.4)1?xZrx Membranes: Effects of Thermal Treatments and Hydrogenation
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Authors
Palumbo, Oriele
Brutti, Sergio
Trequattrini, Francesco
Sarker, Suchismita
Dolan, Michael
Chandra, Dhanesh
Paolone, Annalisa
Issue Date
2015-05-06
Type
Article
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Keywords
amorphous membranes , differential thermal analysis (DTA) , elastic modulus , hydrogenation , thermogravimetric analysis (TGA) , X-ray diffraction (XRD)
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Abstract
Amorphous (Ni0.6Nb0.4)1?xZrx membranes were investigated by means of X-ray diffraction, thermogravimetry, differential thermal analysis and tensile modulus measurements. Crystallization occurs only above 673 K, and even after hydrogenation the membranes retain their mainly amorphous nature. However, after exposure to gaseous hydrogen, the temperature dependence of the tensile modulus, M, displays large variations. The modulus of the hydrogen reacted membrane is higher with respect to the pristine samples in the temperature range between 298 K and 423 K. Moreover, a sharp drop in M is observed upon heating to approximately 473 K, well below the glass transition temperature of these glasses. We propose that the changes in the moduli as a function of temperature on the hydrogenated samples are due to the formation of nanocrystalline phases of Zr hydrides in (Ni0.6Nb0.4)1?xZrx-H membanes.
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Creative Commons Attribution 4.0 United States