Titanium and nickel alloys represent a significant metal portion of the aircraft structural and en components and the residual stresses induced by machining are very critical due to safety sustainability concerns. This paper presents experimental investigations and finite element simulat on turning of Ti–6Al–4V titanium alloy and IN100 nickel based alloy with uncoated and TiAlN co tools. Face t...

As an analogy to nickel-based superalloys, ferritic superalloys based on Fe-Al-Cr-Ni-Ti are proposed for high-temperature applications, especially for fossil-energy power systems. Integrated computational tools will be employed to investigate thermodynamic, kinetic, and meso-scale properties of the proposed alloy systems. Meanwhile, selected microstructural attributes in representative model fe...

The effect of prior air exposure on rupture life of superalloys is reported. Oxygen is identified as a damaging species leading to severe losses in both rupture life and ductility. Similar embrittlement is observed in pure nickel and a mechanism is proposed in terms of reduced grain boundary mobility. Two cobalt base alloys and an oxide dispersion strengthened nickel base alloy do not embrittle...

The aim of this study was to evaluate the allergenic potential of orthodontic brackets, comparing the cutaneous sensitivity provoked by metals present in conventional metallic brackets to that provoked by brackets with a low concentration of nickel, known as "nickel-free". A sample was selected from 400 patients undergoing treatment in the orthodontic clinic of the Pontifical Catholic Universit...

We report on the first case in Ireland of ureteric stenting with shape-memory alloy nickel-titanium (Memokath 051) stent in relieving malignant ureteric obstruction. Successful drainage was achieved and the patient required no further intervention indicating a clear place for these stents in the long-term management of malignant ureteric strictures. The use of ureteric double-J stenting in the ...

This study was conducted to evaluate the biocompatibility of titanium-nickel shape memory alloy used as a medical implant material. The authors carried out the following electrochemical corrosion test and in vivo and in vitro biological tests for the alloy and some metal and alloys clinically used previously to compare the intensities concerned with the biological reactions, that is, (1) anodic...

Some of the component metals of the alloys used for total joint prostheses are toxic and dissolve in the body fluids. It is important to establish how toxic these metals are and to assess the risk of localised tissue necrosis around the prostheses. This has been investigated by incubating primary monolayer cultures of human synovial fibroblasts with various preparations of metals for periods up...

BACKGROUND: In this paper, a physical method to prepare copper-nickel alloy particles in the sub-micron range for possible self controlled magnetic hyperthermia treatment of cancer is described. It is reported that an increase in tumor temperature decreases the tumor resistance to chemo- and radiation therapies. Self controlled heating at the tumor site to avoid spot heating is managed by contr...

Feeding of the nickel-based alloys CZ-100, M-35-1, and CW-12MW, as well as of the austenitic stainless steel CN-7M, is investigated, using a combination of casting experiments and simulation. Casting trials are performed at five foundries, to produce a total of 55 plates of varying lengths and radiographic soundness levels. In order to develop the property databases necessary to simulate the ca...

Experimental results on hot deformation and dynamic structural processes of nickel based alloy Inconel 718 are reviewed. The focus is the analysis of dynamic precipitation processes which operate during hot deformation of these materials at elevated temperatures. Hot compression tests were performed on the solution treated precipitation hardenable nickel based superalloy Inconel 718 at 720-1150...