Showing papers in "Scripta Materialia in 2017"

TL;DR: In this paper, a brief review of historical trends in vehicle weight and automotive magnesium is presented, followed by a discussion of manufacturing and processing, in-service performance, and cost requirements.

TL;DR: In this article, the authors identify gaps in the present state of knowledge and describe emerging research directions for ultra-high temperature ceramics, including testing/characterization in extreme environments, composites, computational studies, and new materials.

TL;DR: In this article, the friction stress and the Hall-petch relationship in CoCrNi equi-atomic medium entropy alloy (MEA) and Ni-40Co alloy were investigated.

TL;DR: In this article, a Zirconium-modified Al-Cu-Mg part with the ultrafine grain exhibits increased yield strength (446-±-4.3 MPa) and ultimate tensile strength (451-± 3.6 MPa).

TL;DR: In this paper, a selective laser melted (SLM) AlSi10Mg alloy has unique hierarchical microstructures, including micro-sized Al grains and transgranular ultrafine cellular structures around primary Al.

TL;DR: In this paper, it was elucidated that an austenitic stainless steel (type 316L) when manufactured through selective laser melting was able to be produced without MnS inclusions and hence with no accompanying Cr-depletion in the vicinity of MnS, resulting in superior corrosion resistance relative to wrought form.

TL;DR: In this article, two types of distinct texture control were achieved in low-modulus beta-type Ti-15Mo-5Zr-3Al alloy products using selective laser melting.

TL;DR: In this article, the authors highlight the recent advance in strong transformation-induced plasticity (TRIP) steels, which have higher alloying contents compared to the conventional TRIP steels for achieving tensile strength higher than 1 GPa.

TL;DR: In this article, a novel equiatomic TiNbTaZrMo high-entropy alloy (HEA) was developed as a new metallic biomaterial, and the HEA showed considerable strength with deformability and superior biocompatibility comparable to pure Ti.

TL;DR: The phase stability of CoCrFeNi alloy has been investigated in this article, where the authors showed that it is thermally metastable at 750 ˚C for 800 h and a second fcc phase with a different lattice constant occurred in the long time annealed at 750 ÆC for 0.1 HEA.

TL;DR: In this paper, the negative stacking fault energy of high entropy alloys at cryogenic temperatures was investigated by first-principles calculations, and it was found that the negative SFEs originate from the thermodynamic metastability of FCC stacking sequence and heavily influenced by the local atomic environment, which in turn affects the formation of stacking faults and nano-twins.

TL;DR: In this paper, the main building blocks of a first generation digital twin of additively manufactured (AM) components are presented from the viewpoints of researchers from several organizations, and a perspective of the current status and research needs are provided.

TL;DR: In this paper, the influence of hydrogen on the mechanical behavior of the CoCrFeMnNi high-entropy alloy (HEA) was examined through tensile and nanoindentation experiments on specimens hydrogenated via gaseous and electrochemical methods.

TL;DR: In this paper, the effects of build direction and heat treatment on the creep properties of Ni-base superalloy fabricated by additive manufacturing were examined at 650°C and the creep rupture lives and ductilities were lower than those of conventionally wrought material, and a row of interdendritic δ-phase with incoherent interfaces was found to affect the materials' creep life and ductility.

TL;DR: In this paper, the authors developed a roadmap to mitigate distortion during additive manufacturing using a strain parameter and a well-tested, three-dimensional, numerical heat transfer and fluid flow model.

TL;DR: In this article, the temperature dependence of energy storage and charge-discharge properties of a lead-free 0.62Bi 0.5 Na 0.32(Sr 0.7 Bi 0.2 □ 0.1 )TiO 3 ergodic relaxor ferroelectric ceramic were investigated.

TL;DR: In this article, a combination of solid solution hardening, nanotwinning and precipitation hardening mechanisms is proposed for single-phase Mo 10 HEAs with face centered cubic (FCC) structure.

TL;DR: In this article, the authors present an overview of the anisotropy of additive manufactured materials and provide some insights into the role of anisotropic load-bearing structures in topology optimization.

TL;DR: In this article, the intrinsic hard magnetic properties of the Co substituted SmFe 12 phase with the ThMn 12 structure were investigated on V(001)-buffered MgO(001) single crystalline substrates.

TL;DR: Additive manufacturing offers unprecedented opportunities to design complex structures optimized for performance envelopes inaccessible under conventional manufacturing constraints as mentioned in this paper, where computational tools are integrated with stochastic process and material awareness to enable the concurrent optimization of design topologies, material constructs and fabrication processes.

TL;DR: In this article, Bulk deformation methods, such as rolling, applied in-process during additively manufactured (AM) can provide significant benefits including reducing residual stresses and distortion, and grain refinement.

TL;DR: In this article, a knowledge of thermodynamics and understanding of the mechanism of coercivity of Nd-Fe-B magnet was used to develop processes for new magnet manufacturing processes.

TL;DR: The phase composition and microstructures of high-temperature RETaO 4 (RE = Nd, Eu, Gd, Dy, Er, Yb, Lu) ceramics were characterized by X-ray diffraction (XRD), scanning electron microscope (SEM) and Raman spectroscopy as mentioned in this paper.

TL;DR: In this paper, the effects of Cu, Mn, Al, Ti, Mo, and relatively high amount of Al facilitated dislocation gliding and martensitic transformation in CoCrFeNi-based face-centered cubic high entropy alloys were investigated using density functional theory calculations.

TL;DR: Fully recrystallized ultrafine grained (UFG) Mg-Zn-Zr-Ca alloy was successfully fabricated by a process including high pressure torsion (HPT) and subsequent rapid annealing treatment.

TL;DR: In this article, some of the recent progress in additive manufacturing of material with spatially varied properties is reviewed alongside some challenges facing and opportunities arising from the technology, as well as the challenges and opportunities of additive manufacturing with site-specific properties.

TL;DR: In this paper, the applicability of binder jetting and material extrusion in the fabrication of Nd-Fe-B bonded magnets is compared. And the challenges of these state-of-the-art technologies for large-scale industrial applications are discussed.

TL;DR: In this paper, a discontinuous SIMT phenomenon (D-SIMT) was observed in the steel by in situ magnetic induction measurements complemented with ex situ X-ray diffraction analysis.

TL;DR: In this paper, a three-dimensional network-woven architecture made of TiB nanowires was designed and realized in the matrix of a Ti6Al4V alloy.