Topic
Zirconium alloy
About: Zirconium alloy is a research topic. Over the lifetime, 6548 publications have been published within this topic receiving 78954 citations. The topic is also known as: zircaloy.
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TL;DR: In this article, the thermal and electrical conductivities of iron, nickel, titanium, and zirconium were measured down to 2 °K. The results indicated that thermal conduction in pure iron and nickel is almost completely electronic.
Abstract: Measurements are reported of the thermal and electrical conductivities of iron, nickel, titanium, and zirconium down to 2 °K. These indicate that thermal conduction in pure iron and nickel is almost completely electronic. Titanium and zirconium exhibit an appreciable lattice component of thermal conduction. In the case of titanium this lattice component varies as T1.5.
40 citations
TL;DR: In this paper, the chemistry of barrier oxide layers formed on zirconium alloys was investigated using atom probe tomography (APT), and grain boundary segregation of Fe and Ni was observed.
40 citations
TL;DR: In this paper, an anhydrous LiCl-KCl eutectic (99.99 % purity, Sigma-Aldrich) was used as the electrolyte by adding 4 wt% ZrCl4 for Zr electrorefining.
Abstract: Pyroprocessing is one of the options for the effective treatment and recycling of spent nuclear fuel (SNF) owing to its economic advantage, environmental safety, and proliferation resistance of the nuclear fuel cycle. [1, 2] The head-end process of the pyroprocessing under development at KAERI includes disassembly and oxidative decladding steps, where cladding hull wastes are generated from the fuel rods. The hull wastes are presumably categorized into high-level wastes (HLW) due to traces of SNF residue and fission products that are implemented into the inner surface of the hulls. Thus, the reduction of the amount of HLW will be one of the key issues for the waste management of the pyroprocess. This study demonstrates the electrorefining process, which is able to recover Zr, which is a major component of the hull wastes such as Zircaloy-4 or Zirlo. Electrochemical behaviors of Zr in LiCl-KCl molten salts are examined using cyclic voltammetries and chronoamperometries. An anhydrous LiCl-KCl eutectic (99.99 % purity, Sigma-Aldrich) was used as the electrolyte at 500 °C by adding 4 wt% ZrCl4 for Zr electrorefining. All the experiments were performed in an Ar-purging glove box, where the oxygen and moisture are controlled below 5 ppm. To examine the electrochemical behavior of Zr, cyclic voltammetries and chronoamperometries were performed using a pure Zr rod as an anode, a tungsten wire cathode, and a Ag/AgCl reference electrode. Subsequently, the Zr anode was replaced with Zircaloy-4 hulls to recover Zr by electrorefining. The Zr deposits were characterized by SEM-EDX, XRD, and ICP-AES. Figure 1 shows cyclic voltammograms of tungsten wire cathodes in LiCl-KCl molten salts at 500 °C. For Zr rod anodes in the absence of ZrCl4, the residual current was less than 0.4 mA with no apparent anodic and cathodic reactions associated with salt components within the potential range of -0.2 V to -1.4 V. However, in the presence of 4 wt% ZrCl4 (red dashed line), several peaks
39 citations
TL;DR: In this article, the ductility of a passive film is estimated by straining the metal covered by the film and observing the current required to keep the film at its normal thickness.
Abstract: An estimate of the ductility of a passive film can be made by straining the metal covered by the film and observing the current required to keep the film at its normal thickness. For the metals tested, the relative ductilities of passive films as measured by this technique decrease in the order tantalum; 16 Cr, 14 Ni, bal. Fe; type 304 stainless steel; iron; aluminum; 60 Ni, 16 Cr, bal. Fe; zirconium; and 80 Ni, 20 Cr.
39 citations
TL;DR: Hardening of Ti-6Al-4V alloy with laser surface melting (LSM) and laser surface alloying (LSA) techniques was attempted in a nitrogeneous atmosphere as mentioned in this paper.
Abstract: Hardening of Ti-6Al-4V alloy with laser surface melting (LSM) and laser surface alloying (LSA) techniques was attempted. Both LSM and LSA were carried out in a nitrogeneous atmosphere. Niobium, molybdenum and zirconium were used as alloying elements in the LSA. A hardness increase was observed for both LSM and LSA. Maximum hardness was obtained for LSM and zirconium alloy addition. In LSM, hardness increased almost three-fold in comparison to the substrate, which has a Vickers hardness of 350, by the formation of TiN in the region of 100 Μm melt depth. Hardness then decreased slowly and reached a minimum of 580 VHN at the maximum melt depth of 750 Μm. However, hardness for the zirconium alloy addition was uniform throughout the melted zone. Ageing treatments were performed for all specimens at 450‡C and different ageing times. Hardness measurements and X-ray diffraction were utilized to delineate the features associated with the hardening of the melted zone.
39 citations