Showing papers in "Materials & Design in 2015"

TL;DR: In this paper, the influence of selective laser melting (SLM) process parameters (laser power, scan speed, scan spacing, and island size) on the porosity development in AlSi10Mg alloy builds has been investigated, using statistical design of experimental approach, correlated with the energy density model.

TL;DR: In this article, the mechanical properties of Ti-6Al-4V samples produced by selective laser melting (SLM) and electron beam melting (EBM) were evaluated for hardness, tensile, and fatigue tests.

TL;DR: In this article, the potential of polypropylene (PP) as a candidate for fused deposition modeling (FDM)-based 3D printing technique was evaluated, starting with the PP pellets, filament production by extrusion and test samples printing.

TL;DR: In this article, a finite element analysis (FEA) simulation with physical testing was used to determine the stiffness matrix of an orthotropic material, including three Young's modulus, three Poisson's ratio and three shear modulus.

TL;DR: In this paper, the influence of energy input on the spatter behavior was investigated by employing 316L stainless steel powder, and the results indicated that energy input affects the size, scattering state and jetting height of spatter.

TL;DR: In this paper, the effect of weaving patterns and random orientatation on the mechanical properties of banana, kenaf and banana/kenaf fiber-reinforced hybrid polyester composites was examined.

TL;DR: In this article, the authors provide values and predictive expressions for the key parameters in existing stainless steel material models based on the analysis of a comprehensive experimental database, which comprises experimental stress-strain curves collected from the literature, supplemented by some tensile tests on austenitic, ferritic and duplex stainless steel coupons conducted herein.

TL;DR: In this paper, the authors investigated the tensile performance and fracture behavior of aluminum matrix composites reinforced with TiB2 nano and microparticles, and found that the porosity of the composites increased with increasing volume fraction and decreasing particle size.

TL;DR: In this paper, the influence of the electrolyte, process parameters, pretreatment and post-treatment on the coating characteristics (surface micrograph, adhesion strength and biological compatibility etc.) is detailed.

TL;DR: In this article, the effect of scan speed v and laser power P on the microstructure, thermal stability and soft magnetic properties has been investigated, and the results indicate that low v and high P lead to the formation of SLM samples with high relative densities, which can reach values of about 99.7%.

TL;DR: An overview of the state-of-the-art of FSW of AMC materials can be found in this article, where the macrostructure and microstructure of AMC joints, the evaluation of mechanical properties of joints, and the wear of friction stir welding tools are discussed.

TL;DR: In this article, a new strategy for functionalizing graphene nanoplatelets (GNPs) by bonding a silane agent to its structure is introduced, which gives the most promising results for fracture toughness of epoxy, showing an 82% increase, and scanning electron microscopy (SEM) micrographs and XRD analysis reveal that an improved dispersion status is obtained by GNP functionalization.

TL;DR: In this paper, the microstructure, phase stability and mechanical properties of a new refractory MoNbHfZrTi high-entropy alloy were reported, which consists of disordered body-centered cubic (BCC) solid solution phase in as-cast and homogenized states.

TL;DR: In this paper, the effect of chemical treatment on hybrid composites was evaluated by using a treated kenaf mat with 6% sodium hydroxide (NaOH) diluted solution.

TL;DR: In this paper, three IIA essential nutrient elements Mg, Ca and Sr and hot rolling and hot-extrusion thermal deformations have been applied to overcome the drawback of pure Zn and benefit the biocompatibility of Zn-based potential implants.

TL;DR: Porous fly ash-based geopolymer material was produced using fly ash and sodium water glass as original material and H 2 O 2 as foaming agent in this paper, where the changes caused by the geopolymersization and decomposition of H 2O 2 on the properties of the final products were investigated by applying curing on geopolym mortars with different amounts of sodium waterglass (60, 80 and 100 ǫ) and H2 O 2 (4, 6 and 8 g) added at various curing temperatures.

TL;DR: In this article, the deformation behavior of an Al0.1CrFeCoNi HEA at high strain-rate (HSR) was analyzed using split-Hopkinson pressure bar.

TL;DR: In this article, a microstructure analysis revealed that modification of the interfacial transition zone (ITZ) was responsible for this strength enhancement, and the results demonstrated that adding 3% or 5% nS to specimens free of silica fume would increase both cement paste and concrete compression strength.

TL;DR: In this paper, the authors examined the shortcomings of normalization methods and suggested ways of improving their use in the engineering design decision-making process, focusing on materials selection, for problems that include target criteria, as well as cost and benefit considerations.

TL;DR: In this article, the effect of aging on mechanical performance with or without a prior solution heat treatment was evaluated with a volumetric fraction of metastable austenite, which was found to vary with heat treatments performed and the initial conditions from which aging was initiated.

TL;DR: In this article, a multilayered stack of an Mg-based WE43 alloy was built using FSAM at two different welding parameters, and the maximum hardness of 115 HV was obtained in as-fabricated state and increased to 135 HV after aging.

TL;DR: In this article, the effects of material selections and stiff material fraction on the Poisson's ratio, equivalent Young's Modulus, and maximum volume reduction were investigated, and the results from finite element analysis (FEA) and mechanical testing indicated that the auxeticity and mechanical properties of this dual-material auxetic metamaterial (DMAM) are distinctly different from those of traditional single-material AUAMs.

TL;DR: In this paper, a functional graded titanium alloy composite was produced using optimized process parameters for each material combination as obtained through a model that was developed in an initial study and the FGM was characterized through metallurgical, mechanical and tribological studies.

TL;DR: In this paper, the authors explored an evolution of a microstructure in AISI 420 martensitic stainless steel during selective laser melting and found that during manufacturing a partitioning and austenite reversion took place, owing to the thermal cycling of the inner regions during manufacturing.

TL;DR: In this paper, a double VAR melted ingot was thermo-mechanically processed and it's microstructure and tensile properties determined as a function of β as well as α+β solution treatment and aging.

TL;DR: In this paper, SBS-modified asphalt copolymers with various styrene-butadiene structures were subjected to frequency sweep tests, viscous measurements and fluorescence microscopy, and the results revealed that the SBSmodified asphalt containing 30% styrene had the optimal viscoelastic functions and the highest viscosity.

TL;DR: In this article, the authors report on heat conduction properties of thermal interface materials with self-aligning magnetic graphene fillers, which can be oriented during the composite application to the surfaces, leading to a new method of thermal management of advanced electronics.

TL;DR: In this paper, the dynamic strength, Young's modulus and energy absorption capacities of two expanded polystyrene (EPS) foams at different strain rates are obtained and some empirical relations are derived.

TL;DR: In this paper, the effect of strain rate on the microstructure evolution of a nickel-based superalloy was investigated by means of isothermal compression tests in the strain rate range of 0.001 − 10 − 1 at 1110 −C.

TL;DR: In this paper, the phase composition and stability of high-entropy alloys were investigated and the formation ability of solid solution phase for this kind of HEAs was comprehensively evaluated.