Showing papers in "Materials & Design in 1993"

TL;DR: In this article, a review is presented for these materials while formation of bands, microstructure, mechanical properties and the modes of fracture are emphasized, and the most susceptible materials to adiabatic shear banding due to their heat diffusion are the Titanium and titanium alloys.

TL;DR: In this article, an approach to fabricating nanocrystalline ceramics is described which involves the generation of nanoscale particles by conventional chemical precipitation techniques and the compaction and sintering of these particles to form solid ceramic bodies with grain sizes in the sub-100 nm range.

TL;DR: In this article, the authors considered the bistable amorphous Co-and Fe-based soft magnetic materials in the framework of both their remagnetization process and possible applications.

TL;DR: In this paper, a new conceptual framework involving an integrated approach to materials development, component design and life prediction for high-temperature applications is outlined, which provides an alternative to the traditional approach which requires the creep to rupture testing of many specimens over long periods.

TL;DR: In this article, five thermal and stress/strain cycling modes for shape memory alloys have been defined and the variation of properties as a function of the number of cycles has been evaluated based on the existing data of TiNi alloys from the literature.

TL;DR: The basis for the report was an extensive questionnaire survey throughout the UK and provides an assessment of the current methods and sources for the provision of information to engineering designers and shows the particular importance of information from suppliers.

TL;DR: In this paper, the microstructures of spray-formed billets of commercial Al alloy 2618 have been investigated as a function of sprayforming conditions and alloy composition, and the results are explained in terms of the relative fractions of liquid and solid on the billet top surfaces during spray forming.

TL;DR: In this article, the configuration of pam furnaces with emphasis on controls that can yield a uniform and reproducible product is described, as well as refining benefits, compositional control and future improvement challenges.

TL;DR: In this article, the problem of pressure-assisted macrosegregation is considered for squeeze cast AA6061, and the results of microstructural observations and mechanical properties are reported.

TL;DR: In this paper, surface engineering by nitriding and carburizing of titanium and steel alloys is briefly reviewed, and the surface features of importance extend below the surface for nanometre dimensions in some processes to several millimetres in other cases depending upon the technologies and applications being considered.

TL;DR: The CVD silicon carbide (CVD-SiC) as discussed by the authors is a single-phase, theoretically dense, and 99.999% pure, cubic (β)-SiC.

TL;DR: In this paper, ultra-high-strength pearlitic steels with C content up to 1.05 wt% and additions of V and Si were investigated over a range of isothermal transformation conditions.

TL;DR: In-situSEM studies have been conducted of the crack path morphology and crack opening displacement for short, self-initiated cracks grown in a near-alpha IMI 834 Ti alloy as discussed by the authors.

TL;DR: Forging trials of the TiAl-based alloy Ti52Al have been carried out over a range of temperatures and strain rates as discussed by the authors, and values of activation energy and strain rate sensitivity have been obtained from stress-strain data.

TL;DR: Stress relaxation testing (SRT) was performed to test for the existence of an inelastic equation of state in polycarbonate at 50°C, 65°C and 80°C.

TL;DR: In this paper, a form of electrostatic sol immersion is investigated to control the electrostatic charge on the surface of the sol particles and the fibres of the matrix composites.

TL;DR: A review of surface treatments and coatings used in metal-forming applications and the rationale behind the selection of such surface-engineering techniques can be found in this paper, focusing on the various observed wear mechanisms encountered in metal forming dies and tools and their significance in relation to the most appropriate selection of materials and surface coatings and treatments.

TL;DR: In this paper, the effect of corrosion pitting on the high-cycle fatigue behavior of engineering components, using a novel fracture mechanics approach, is quantitatively described and model the impact of corrosion pit nucleation and growth kinetics.

TL;DR: Boriding can be used to create a hard, tough surface "case" on nickel alloys, extending the application of these materials into more severe environments as discussed by the authors, where the case layer is a complex nickel boride layer.

TL;DR: In this paper, the properties of carbon and silicon carbide fiber reinforced ceramic matrix composites (CMCs) and their potential applications are discussed and discussed in detail for applications requiring zero or controlled thermal expansion, low density, high stiffness, refractoriness, damage tolerance and high strength to low mass ratio.

TL;DR: In this article, the results of steel hardening tests performed with a central tower and a mirror field system installation at Plataforma Solar de Almeria (PSA, Spain) and with a Fresnel lens at thhe Instituto de Energias Renovables (IER, Madrid, Spain), are discussed.

TL;DR: In this article, the micromechanism which controls the frictional conditions in sheet metal forming operations is studied and it is shown how different material and process parameters affect friction and how friction can be controlled by a suitable selection of these parameters.

TL;DR: In this article, single crystals oriented at Ni-rich and Al-rich Ni 3 Al both with addition of 1 at% boron, deformed at room temperature, were studied using transmission electron microscopy (TEM).