Showing papers in "Materials & Design in 2014"

TL;DR: Shape memory alloys (SMAs) are a class of shape memory materials (SMMs) which have the ability to "memorise" or retain their previous form when subjected to certain stimulus such as thermomechanical or magnetic variations.

TL;DR: In this paper, the authors cover the latest developments in enhanced mechanical properties of aluminium alloys, and high performance joining techniques, including laser beam welding and friction stir welding, and compare them with the traditional aluminum alloys.

TL;DR: The RepRap as discussed by the authors is an open-source self-replicating rapid prototyper that makes 3D polymer-based printers readily available to the public at low costs.

TL;DR: In this paper, the effect of different proportions of ground granulated blast-furnace slag and activator content on the workability and strength properties of fly ash based geopolymer concrete was evaluated.

TL;DR: In this article, the effects of laser power and scan speed on the thermal behavior of selective laser melting (SLM) additive manufacturing of AlSi10Mg powder were investigated.

TL;DR: In this paper, a unique cell type called gyroid is designed to construct periodic lattice structures and utilize its curved cell surface as a self-supported feature which avoids the building of support structures and reduces material waste and production time.

TL;DR: In this paper, the effects of the volume fraction and length of basalt fiber (BF) on the mechanical properties of fiber reinforced concrete (FRC) were analyzed with the scanning electron microscope and mercury intrusion porosimeter.

TL;DR: In this article, the development of laser cladding for functional coatings with high wear resistance, good corrosion and oxidation resistance, and better medical biocompatibility is reviewed, and the existing problems and the corresponding solutions are discussed.

TL;DR: In this paper, the volume fractions of DRX were estimated based on the conventional DRX kinetics model and a segmented model was proposed to describe the dynamic recrystallization behavior of a typical nickel-based superalloy.

TL;DR: In this article, the authors investigated the manufacturability of overhang structures using optimized support parts and found that with optimized supports it is possible to build non-assembly mechanism with overhang surfaces.

TL;DR: In this article, the authors presented the experimental results of a study on comparing the difference in properties of recycled aggregates (RAs) with varying amounts of old adhered mortar obtained from different sources and evaluating the influence of the different RAs on the mechanical and durability properties of the recycled aggregate concrete (RAC).

TL;DR: In this article, the characteristics of microstructure, composition and phase of as-deposited cladding layers were analyzed through Scanning Electron Microscope (SEM) and X-ray diffraction (XRD), as well as relative model.

TL;DR: In this article, the effect of different commercial superplasticizers (SPs) such as naphthalene, melamine and modified polycarboxylate based on the workability and strength of a class F fly ash geopolymer paste activated by two different activator combinations, i.e. 8 M sodium hydroxide solution and a multi-compound activator composed of 8 M NaOH solution (28.6%) + Na 2 SiO 3 (71.4%).

TL;DR: In this article, the effect of SiC particle size and its amount on both physical and mechanical properties of Al matrix composite were investigated, and the results showed that the dominant components were Al and SiC.

TL;DR: In this paper, the influence of nanosilica (nS) addition on properties of ultra-high performance concrete (UHPC) was evaluated aiming to evaluate the influence.

TL;DR: In this article, the effect of nano-SiO 2 and nano-Al 2 O 3 on the properties of high calcium fly ash geopolymer pastes has been investigated.

TL;DR: In this paper, a novel method is proposed that modifies the theoretically optimal topology as required to ensure manufacturability without requiring additional support material, based on identified design for additive manufacture rules.

TL;DR: In this paper, the effects of materials position and welding speed on the material flow, microstructure, microhardness distribution and tensile property of the joints were investigated, and it was revealed that the material mixing is much more effective when AA6061 alloy was located on the advancing side and multiple vortexes centers formed vertically in the nugget.

TL;DR: In this paper, the authors reviewed the interaction between hydroxyapatite (HA) and titanium (Ti) alloy in various conditions, in vitro and in vivo tests, and common powder metallurgy processes for HA/Ti composites (e.g., pressing and sintering, isostatic pressing, plasma spraying and metal injection molding).

TL;DR: In this article, the cracking, spalling and residual strength behaviors of geopolymer concrete were studied in order to understand its fire endurance, which is essential for its use as a building material.

TL;DR: In this paper, the performance of binary and quaternary Mg-xCa alloys was investigated using X-ray diffraction, Fourier-transformed infrared spectroscopy (FTIR), scanning electron microscopy (SEM), and energy dispersive Xray spectroscopic (EDS).

TL;DR: A comprehensive overview of the previous works carried out on using different admixtures and additives in AAFA system is presented in this paper, where the authors have employed different fibers, chemical admixtures, mineral admixture, additives and other materials in AA FA system aiming to modify special properties of this system.

TL;DR: In this article, the worn surfaces of hybrid composites and base alloys were studied through SEM and EDS systems and some useful conclusions were made by using a pin-on-disc apparatus with various input parameters like applied load (10, 20, and 30 n), sliding speed (0.6, 0.8, and 1.0 n), and sliding distance (1000, 1500, and 2000 m).

TL;DR: In this paper, the effects of adding nano-alumina particles to Al6061 alloy and extrusion process on the mechanical and microstructure properties of the composites were investigated.

TL;DR: In this article, the fabrication and mechanical investigation of aluminium alloy, alumina (Al2O3) and boron carbide metal matrix composites is discussed, where the fabrication is done by stir casting which involves mixing the required quantities of additives into stirred molten aluminium.

TL;DR: In this article, the welding nugget can be considered as aluminum matrix composite, which is enhanced by dispersed sheared-off steel fragments encompassed by a thin inter-metallic layer or simply intermetallic particles.

TL;DR: In this article, the effect of nano silica (NS) on the compressive strength of mortars and concretes containing different high volume fly ash (HVFA) contents ranging from 40% to 70% (by weight) as partial replacement of cement.

TL;DR: In this article, the authors classified and described the various procedures that have been developed to extract fibres from raw bamboo culm and analyzed composite preparation from extracted bamboo fibres, including fiber extraction methods, fibre length, fibre size, resin application, temperature, moisture content and composite preparation techniques.

TL;DR: In this article, the effect of applied linear energy density (LED) on the temperature distribution, melt pool dimensions, behaviors of gaseous bubbles and resultant densification activity has been investigated.

TL;DR: In this paper, the mechanical properties and microstructure of high calcium fly ash geopolymer containing ordinary Portland cement (OPC) as additive with different curing conditions were investigated.