Influence of Oxygen on the Damping Properties of Nb-Zr Alloys

Florêncio, Odila; Silva, Paulo Sergio; Stefanini, T.F.; Botta Filho, Walter José

doi:10.4028/www.scientific.net/KEM.319.121

Paper Titles

The Resonant Vibration Fracture Characteristics of Al-xZn Alloy and Mg-xAl-Zn Alloy
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Low-Frequency High-Temperature Internal Friction in Ti-13Nb-13Zr Alloy
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Damping Behaviors of the Commercially Pure Al Prepared by ECAP
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Ultrasonic Attenuation Properties of Porous and Cellular Al Alloy with Spherical Pore
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Influence of Oxygen on the Damping Properties of Nb-Zr Alloys
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Hydrogen-Induced Damping Peak Temperatures in Bulk Metallic Glasses
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High Damping Performance of Hydrogenated Bulk Metallic Glasses
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Internal Friction and Mechanical Strength of Hydrogenated Ti-Rich Multicomponent Glassy Alloys
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Can Metallic Glass Damping Be Increased by Stress Training Treatment?
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Home Key Engineering Materials High Damping Materials IIInfluence of Oxygen on the Damping Properties of...

Influence of Oxygen on the Damping Properties of Nb-Zr Alloys

Abstract:

Nb-1 wt% Zr polycrystalline and single crystalline samples were submitted to annealing, at pressure of 2.5 x 10-8 Torr and subsequently annealed in an oxygen atmosphere for three hours, in a temperature of 1170 K in oxygen at partial pressure of 5 x 10-5 Torr. Internal friction measurements as a function of temperature were performed between 300 K and 650 K, using a torsion pendulum inverted Kê-type operating in a frequency oscillation in the hertz bandwidth. Three internal friction peaks, which were assigned as Nb-O, Zr-O and Nb-N peaks were observed in oxidized single crystal sample and the relaxation parameters of the three peaks were obtained.

Info:

Periodical:

Key Engineering Materials (Volume 319)

Main Theme:

High Damping Materials II

Edited by:

N. Igata and S. Takeuchi

Pages:

121-126

DOI:

https://doi.org/10.4028/www.scientific.net/KEM.319.121

Citation:

O. Florêncio et al., "Influence of Oxygen on the Damping Properties of Nb-Zr Alloys", Key Engineering Materials, Vol. 319, pp. 121-126, 2006

Online since:

September 2006

Authors:

Odila Florêncio, Paulo Sergio Silva, T.F. Stefanini, Walter José Botta Filho

Keywords:

Internal Friction, Nb-Zr Alloys, Nitrogen Snoek Peak, Oxygen Snoek Peak

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Paper TitlePages

Precipitate Behavior and Microstructure Characterization of An Al-Zn-Mg-Cu Alloy Prepared by Spray Forming Process

Authors: Bao Hong Zhu, Bai Qing Xiong, Yon Gan Zhang, Udo Fritsching, Ji Shan Zhang, Feng Wang, Zhi Hui Li, Hong Wei Liu

Abstract: A high Zn content Al-Zn-Mg-Cu alloy was prepared by spray forming process and the precipitate behavior and microstructure of the extruded alloy were also investigated. The precipitate sequence of the spray-formed alloy could be described as “α-solid solution → GPI zone → GPII zone (also called Metastable ′ )→ Stable  (MgZn2)” during artificial ageing treatment. In the early stage of artificial ageing treatment, the GPI zone was the main strengthening phase and kept coherent relationship with the matrix. With the increasing of ageing time, ′ phase dominate strengthening phase and kept semi-coherent relationship with the matrix. With the further increasing of ageing time,  phase took the place of ′ phase, and dominated the strengthening phase in the alloy. The grain size of the spray deposit is finer than that of cast alloys. The ultimate tensile strength of the alloy is over 810MPa in peak ageing condition.

481

Phase Transformations in Ferromagnetic Nanostructured FePd Alloy under Severe Plastic Deformation and Annealing

Authors: N.I. Vlasova, V.S. Gaviko, A.G. Popov, N.N. Shchegoleva, L.A. Stashkova, Dmitriy Gunderov, Xavier Sauvage

Abstract: Equiatomic FePd alloy in the ordered state has been processed by means of high-pressure torsion deformation (HPTD) and then annealed. X-ray diffraction (XRD), transmission electron microscopy (TEM), and magnetic measurements have been carried out. HPTD results in an order-disorder transformation of the initial ordered L10-phase (s.g. P4/mmm) into a disordered fcc phase (s.g. Fm-3m) through the body-centered tetragonal (bct) phase (s.g. I4/mmm). Subsequent annealing restores the L10-phase.

392

Effects of Annealing on Microstructure and Martensitic Transition of Ni-Mn-Co-In Ferromagnetic Shape Memory Alloys

Authors: Katarzyna Bałdys, Grzegorz Dercz, Łukasz Madej

Abstract: The ferromagnetic shape memory alloys (FSMA) are relatively the brand new smart materials group. The most interesting issue connected with FSMA is magnetic shape memory, which gives a possibility to achieve relatively high strain (over 8%) caused by magnetic field. In this paper the effect of annealing on the microstructure and martensitic transition on Ni-Mn-Co-In ferromagnetic shape memory alloy has been studied. The alloy was prepared by melting of 99,98% pure Ni, 99,98% pure Mn, 99,98% pure Co, 99,99% pure In. The chemical composition, its homogeneity and the alloy microstructure were characterized using scanning electron microscopy (SEM) and transmission electron microscopy (TEM). The phase composition was also studied by X-ray analysis. The transformation course and characteristic temperatures were determined by the use of differential scanning calorimetry (DSC) and magnetic balance techniques. The results show that Tc of the annealed sample was found to decrease with increasing the annealing temperature. The Ms and Af increases with increasing annealing temperatures and showed best results in 1173K. The studied alloy exhibits a martensitic transformation from a L21 austenite to a martensite phase with a 7-layer (14M) and 5-layer (10M) modulated structure. The lattice constants of the L21 (a0) structure determined by TEM and X-ray analysis in this alloy were a0=0,4866. The TEM observation exhibit that the studied alloy in initial state has bigger accumulations of 10M and 14M structures as opposed from the annealed state.

171

Thermal Stability of Vacuum Hot Pressed Bulk Nanostructured Al-Cu Alloys

Authors: Thangaraju Shanmugasundaram, Martin Heilmaier, V. Subramanya Sarma, B.S Murty

Abstract: Bulk nanostructured Al-4Cu alloy was synthesized by high energy ball milling followed by vacuum hot pressing. Its thermal stability was investigated up to 450°C using differential scanning calorimetry, X-ray diffraction, and transmission electron microscopy. The results showed that grain growth in this Al-4Cu alloy was very limited and grain sizes in the range of 100 nm were still present in the alloys after exposure to 450 °C corresponding to a temperature as high as 0.77 T/Tm. The TEM investigations reveal that such a high thermal stability against grain growth observed in this alloy is attributed to the presence of ultrafine dispersoids.

234

Thermal Stability of Ni40Ti40Nb20 and Ni32Ti48Nb20 Tapes Obtained by Rapid Solidification Technique

Authors: György Thalmaier, Ioan Vida-Simiti, N. Jumate, Viorel Aurel Şerban, C. Codrean, Mircea Nicoară, L. Bukkosi

Abstract: Nickel–titanium- group 5A metal (V, Nb, Ta, Zr) alloys are known as promising hydrogen-selective membrane materials. They can potentially be used in membrane reactors, which can produce high-purity H₂ and CO₂ streams from coal-derived syngas at elevated temperatures. The master alloys were prepared by arc melting using high purity metals in a Ti-gettered argon atmosphere. The alloys were melted several times in order to improve homogeneity. The ingots were induction-melted under a high-purity argon atmosphere in a quartz tube and graphite crucible injected through a nozzle onto a Cu wheel to produce rapidly solidified amorphous ribbons. Thermal stability of the Ni40Ti40Nb20 and Ni32Ti48Nb20 thin tapes has been examined using DTA analysis.