Showing papers in "Scripta Materialia in 2013"

TL;DR: In this paper, a high-entropy FeCoNiCrMn alloy with a single face-centered cubic phase was synthesized and subsequently annealed at different temperatures to systematically investigate the grain growth behavior.

TL;DR: In this paper, X-ray diffraction and transmission electron microscopy experiments are employed to investigate the mechanical stability of retained austenite in a quenching and partitioning steel.

TL;DR: In this article, the authors investigate the strain hardening of two austenitic high-Mn low density steels, namely, Fe 30.5Mn−2.1Al−1.2C and Fe 8.0Al−2C (wt.%), containing different precipitation states.

TL;DR: The formation of deformation, annealing and growth twins in face-centered cubic materials is discussed in this paper, where the influence of metallurgical variables on twinning can only be rationalized in terms of the model.

TL;DR: Architectured or hybrid materials are combinations of two or more materials or of materials and space, configured in such a way as to have attributes not offered by any one material alone.

TL;DR: The strength of nc-Cr samples apparently obeyed the classical Hall-Petch relationship as mentioned in this paper, and it was found that hardening potency caused by grain refinement was generally higher in body centered cubic metals than that in face-centered cubic and hexagonal close-packed metals.

TL;DR: Carbon nanotube (CNT)-reinforced aluminum composites were fabricated through ball milling combined with rolling as discussed by the authors, and the composites exhibit high strength and high strain-hardening ability.

TL;DR: In this article, a linear relationship between the inverse square root of the dislocation mean free path and the true stress was obtained at strains up to 0.12, indicating that strain hardening was due to dynamic microstructural refinement induced by twinning.

TL;DR: In this article, a unified mechanism for field-assisted phenomena such as enhanced rapid flash sintering, reduction in flow stress and grain growth retardation is proposed, where defect segregation causes enhanced ionic and electronic transport along dislocations and grain boundaries.

TL;DR: In this paper, the mechanical properties of the 6.8-wt.% Al-containing alloy were compared to those of dual-phase steel but with the benefit of reduced density and better formability.

TL;DR: In this article, the authors studied the deformation mechanisms of low-density Fe-Mn-Al-C austenitic steels based on the dislocation substructure evolution during tension at ambient temperature.

TL;DR: In this paper, the thermoelectric properties of new Bi and Sb-doped Mg2Si0.55Sn0.4Ge0.05 compounds prepared by powder methods were studied in the temperature range 300-823 K.

TL;DR: In this paper, a method to achieve rapid pressureless low-temperature sintering of Ag nanoparticles for bonding was described, in which organic shells adsorbing on the surface of nanoparticles to stabilize them were thinned to create a sparse protecting layer.

TL;DR: In this paper, the structure and chemical composition of the κ-carbide formed as a result of isothermal transformation in an Fe-3.0Mn-5.5Al-0.3C alloy were studied using transmission electron microscopy and atom probe tomography.

TL;DR: A rare transformation from a hexagonal close-packed (hcp) phase to a face-centered cubic (fcc) phase was found in pure Ti deformed by cryogenic channel-die compression indented for microstructural refinement as mentioned in this paper.

TL;DR: In this article, the microstructure and tensile behavior of low-density steels containing 5% Al were investigated, and the effects of solute content on grains and of austenite grain size on stability were discussed.

TL;DR: In this paper, the authors designed copper alloys that exhibit high strength and conductivity by using solid-solution hardening enhanced by supersaturation with Mg and showed that the Cu-Mg alloy has a conductivity at least three times higher than that of the representative Cu-Sn, while retaining comparable strength.

TL;DR: The average hardness of retained austenite and ferrite is 7.7 and 3.4 GPa, respectively as mentioned in this paper, which may be due to the varied stability and boundary structure of different Austenite grains.

TL;DR: In this paper, the authors introduce the viewpoint set on architectured materials and illustrate the paradigm shift which occurs by introducing additional length scales into a material in addition to those provided by the microstructure.

TL;DR: In this article, the growth process of (1 ¯ 0 1 2 ) twins is studied in magnesium using atomistic simulations, and it is shown that a specific interface, which places prismatic and basal planes face-to-face, plays an important role.

TL;DR: In this paper, a lath-like martensite phase was fabricated by laser cladding, which combines attractive properties including hardness (11.6 GPa), elastic constant (187.1GPa), fracture toughness (50.9 MPa), and softening resistance (up to 900 °C).

TL;DR: In this article, the effects of substituting different cations (Mn, Zn, Mg and Co) at the A-site of AZrNb2O8 compounds on structural parameters such as packing fraction and B-site octahedral distortion were studied using X-ray powder diffraction in conjunction with Rietveld refinement.

TL;DR: In this paper, a very low pressure gas or blow forming process for shaping a bulk metallic glass (BMG) in its supercooled liquid state that avoids the frictional stick forces experienced by conventional shaping techniques by engineering the expansion of a pre-shape or parison of BMG material is provided.

TL;DR: In this paper, the effects of doping atoms (X) on the uniaxial deformation and universal ductility of Mg47X1 are investigated, and a first-principles design map in regard to the generalized stacking-fault energy (GSFE) provides a database for new Mg alloys design.

TL;DR: In this article, the thermal cycle during dissimilar friction spot welding of Al alloy AA5754 to Mg alloy AZ31 was measured by thermocouples located in the weld region.

TL;DR: In this article, the cyclic deformation induced an abnormal grain coarsening that initiated from the subsurface layer and grew along 45° to the stress axis toward the top surface layer, where the fatigue cracks were formed.

TL;DR: The coercivity of a hot-deformed Nd-Fe-B magnet was enhanced from 1.6 to 2.6 by a low-temperature grain boundary diffusion process using a Nd60Dy20Cu20 near-eutectic alloy as discussed by the authors.

TL;DR: In this paper, a new type of long-period stacking ordered (LPSO) structures were observed in Mg-Co-Y as-cast alloys by means of transmission electron microscopy and scanning transmission-electron microscopy.

TL;DR: In this article, cold pre-forging is used for improving the mechanical properties of extruded magnesium alloys, by inducing numerous twins in the billet, which in turn provides nucleation sites for dynamic recrystallization during extrusion.