Showing papers in "Scripta Materialia in 2012"

TL;DR: In this article, aluminum composites reinforced with graphene nanosheets (GNSs) were fabricated for the first time through a feasible methodology based on flake powder metallurgy.

TL;DR: The market split roughly 2:1 between Nd-Fe-B and hard ferrite, whose costs are currently in a ratio of more than 25:1 as discussed by the authors, and the escalation of rare earth costs presents an opportunity for new magnets with an energy product of 100-200kJ/m −3, intermediate between ferrite ( −3 ) and Nd−Fe −B (> 200kJ /m−3 ), provided the costs of raw materials and manufacturing are kept low.

TL;DR: The formation of continuous thin layers of a Ndrich amorphous phase surrounding Nd 2 Fe 14 B grains is the key microstructural feature of high-coercivity Nd-Fe 14 B magnets.

TL;DR: In this article, a nickel-based superalloy was deposited on a polycrystalline substrate by a laser-aided direct metal deposition process and the effect of laser beam scanning pattern on dendrite growth morphology was investigated using electron backscatter diffraction.

TL;DR: In this paper, a novel nanoprocessing method that combines liquid state ultrasonic processing and solid state stirring is presented for fabrication of bulk metal-graphene nanoplatelets nanocomposites.

TL;DR: In this paper, preliminary results are presented on attempts to develop a new family of titanium alloys with high ductility induced by combined transformation-induced plasticity and twinning induced plasticity effects.

TL;DR: In this article, the authors constructed the first Ashby-style map of magnetic refrigerant properties, comparing popular materials with limits derived from an idealized first-order transition model.

TL;DR: In this article, equal channel angular pressing was used to consolidate commercially pure titanium chips into fully dense bulk material with high strength (up to 650 MPa), due to an ultrafine grain size as low as 0.8 μm, and good ductility.

TL;DR: In this paper, the influence of grain size on the strain hardening of two Fe −22Mn −0.6C (wt.%) twinning-induced plasticity steels with average grain sizes of 3 and 50μm, respectively, was investigated.

TL;DR: In this paper, the mechanisms of strengthening and toughening of hot-rolled AZ31 magnesium alloy by extension twins during strain path changed recompression are studied in the current paper.

TL;DR: In this paper, the authors highlight the unique role of nanoscale twin lamellae in producing the hard and soft modes of dislocation glide, as well as how the coherent twin boundaries affect slip transfer, dislocation nucleation, twinning and detwinning.

TL;DR: In this paper, the authors used various graphene platelets with the aim of improving the fracture toughness of Si3N4 composites, with the highest value of 9.92 MPa/m 0.5.

TL;DR: In this paper, the tensile and compressive properties of AZ31 plates were dramatically enhanced by pre-rolling with small thickness reduction along the transverse direction, attributed to the subdivision of grains by introducing extension twin boundaries.

TL;DR: A combination of high resolution characterization, molecular dynamics and micromagnetic simulations and model thick film systems has been used to gain valuable new insights into the coercivity mechanisms in R-Fe-B magnets as discussed by the authors.

TL;DR: In this paper, a method for preparing a paste containing a high concentration of Ag nanoparticles for pressureless bonding was developed. But this method requires the use of polyvinylpyrrolidone to prevent the coalescence of the nanoparticles.

TL;DR: In this article, selective laser melting (SLM) was applied to prepare nanocrystalline TiC-reinforced Ti matrix nanocomposites, and the optimal TiC content was determined to be 12.5 wt.

TL;DR: In this paper, a mechanism for the formation of a fine granular area in high-strength steels generated by a very high number of cycles to failure is proposed, where the crack initiation and propagation mechanism is not fully understood.

TL;DR: In this article, the size dependence in the torsional response of micro-sized polycrystalline copper wires is investigated experimentally using a novel automated torsion balance.

TL;DR: In this paper, an in situ reaction between TiB2 and Ti-6Al-4V powders during a spark plasma sintering process was used to synthesize Ti alloy matrix composites reinforced with nanosized TiB whiskers.

TL;DR: In this article, a viewpoint paper on the last step of near net-shaped manufacturing of complex geometries of magnetic refrigerants is presented, where the authors discuss the issues of thermal transport properties, corrosion protection and mechanical stability.

TL;DR: In this article, the structural entropy contribution to the total isothermal entropy change of materials which undergo a magnetostructural first-order phase transition was determined, and the structural entropies range from 4.5 to 45.

TL;DR: In this article, the thermal stability of nanotwinned metals was compared to their nanocrystalline counterparts, and it was shown that the thermal energy stored at twin boundaries is an order of magnitude lower than at high-angle grain boundaries.

TL;DR: In this article, the Schmid factors for four slip systems (basal 〈a〉, prismatic, pyramidal and pyramid ǫ-a-drone slips) and two twinning patterns (1 0 1 ¯ 2 and { 1 0 1¯ 1 } twins) were systematically calculated in magnesium as a function of angles between the c-axis and the loading direction.

TL;DR: In this paper, hydrogen embrittlement was observed in an Fe-18Mn-1.2C (wt.%) steel and microstructural observations indicate that cracks are initiated at grain boundaries and twin boundaries.

TL;DR: In this paper, the deformation behavior of a duplex lightweight Fe-Mn-Al-C steel with a bimodal structure consisting of clustered austenite particles with a coarse ferrite matrix has been investigated.

TL;DR: In this paper, single crystal tensile creep tests have been performed on L12-containing cobalt-based alloys loaded along the [0, 0, 1] orientation.

TL;DR: In this paper, the generalized stacking fault energies of magnesium and their alloys have been calculated using density functional theory, and it is shown that the deformation tendency caused by partial dislocations emission varies with alloying elements.

TL;DR: In this article, the average activation energy and volume of flow units of metallic glasses can be measured by a dynamic mechanical analysis which is a sensitive tool for detecting atomic rearrangements associated with the flow defects.

TL;DR: In this paper, the effects of twin thickness, grain size and strain rate on the work-hardening behavior of polycrystalline pure Cu with nanoscale twins are analyzed.

TL;DR: In this paper, a 3DAP analysis of vanadium carbide (VC) precipitation steel was performed using a three-dimensional atom probe (3DAP) with a deuterium-charging method.