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2018-08-03
11:15
[PUBDB-2018-02741] Journal Article
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Lattice and phase strain evolution during tensile loading of an intermetallic, multi-phase γ-TiAl based alloy
Intermetallic g-TiAl based alloys are promising materials for lightweight high-temperature applications,but their limited room temperature ductility poses an obstacle to the exploitation of their full potential.Especially in the case of multi-phase TiAl alloys, such as the b-stabilised TNM alloy of a nominal chemicalcomposition of Ti-43.5Al-4Nb-1Mo-0.1 B (in at.%), an understanding of deformation and load partitioningmechanisms is required that works at all scales and encompasses all phases, including e.g. bo. [...]
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2018-07-24
17:12
[PUBDB-2018-02672] Journal Article
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Investigation of single phase $Cu_{2}ZnSn_{x}Sb_{1−x}S_{4}$ compounds processed by mechanochemical synthesis
The copper zinc tin sulfide (CZTS) compound is a promising candidate as an alternative absorber materialfor thin-film solar cells. In this study, we investigate the direct formation of Cu1.92ZnSnx (Sb1−x )S4 compounds[CZT(A)S], with x = 1, 0.85, 0.70, and 0.50, via a mechanochemical synthesis (MCS) approach, starting frompowders of the corresponding metals, zinc sulfide, and sulfur. [...]
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ddc:530
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2018-06-28
15:42
[PUBDB-2018-02436] Journal Article
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Residual stresses and fatigue crack growth in friction surfacing coated Ti-6Al-4V sheets
The relation between the translational stud speed and the residual stress (RS) state of Friction Surfacing (FS) coated 2 mm thick Ti-6Al-4V sheets was studied using synchrotron diffraction. The influence of the RS state on fatigue crack propagation (FCP) was studied using C(T)-100 samples.It was shown that an active zone of tensile RS is present in the coated region, inducing compressive stresses in the remaining sheet. [...]
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2018-05-23
19:07
OpenAccess [PUBDB-2018-02080] Journal Article
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Experimental and numerical investigation of residual stresses in laser shock peened AA2198
Laser shock peening (LSP) is a surface treatment which improves the fatigue performance of metallic structures by introducing compressive residual stresses. The aim of this paper is the investigation of LSP of the aluminium alloy AA2198. [...]
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ddc:670
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2018-05-23
10:33
[PUBDB-2018-02047] Journal Article
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Synthesis of metal-intermetallic laminate (MIL) composites with modified Al$_3$Ti structure and in situ synchrotron X-ray diffraction analysis of sintering process
Al$_3$Ti-based alloys attract exceptional attention due to their high specific mechanical properties. However, their application is still insufficient due to their low ductility and fracture toughness. [...]
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2018-04-27
13:37
Embargoed OpenAccess [PUBDB-2018-01869] Journal Article
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Formation of block-copolymer-templated mesoporous silica
In situ attenuated total reflectance Fourier transform infrared spectroscopy is used to monitor the chemical evolution of the mesoporous silica SBA-15 from hydrolysis of the silica precursor to final silica condensation after the particle formation. Two silica precursors, tetraethyl orthosilicate (TEOS) or sodium metasilicate (SMS) were used, and the effects of additive (heptane and NH$_4$F) concentrations were studied. [...]
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ddc:540
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2018-04-27
12:48
[PUBDB-2018-01868] Journal Article
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Effects of laser processing on the transformation characteristics of NiTi: A contribute to additive manufacturing
Laser additive manufacturing of NiTi generates complex microstructural features not fully understood yet. Thermalsimilarities between lasermicrojoining and laser additivemanufacturing, enables correlating the effect of thelaser on the material in both processes. [...]
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2018-04-26
14:19
[PUBDB-2018-01858] Journal Article
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The grain boundary pinning effect of the μ phase in an advanced polycrystalline $\gamma /\gamma ′$ Co-base superalloy
A grain boundary pinning phase was introduced into a $\gamma /\gamma ′$ Co-base superalloy by the addition of Mo. Theintermetallic phase was identified as m phase (Co,Ni,Cr)$_7$(W,Mo)$_6$ by high-energy X-ray diffraction andenergy-dispersive X-ray spectroscopy in the transmission electron microscope. [...]
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2018-04-26
10:39
Embargoed OpenAccess [PUBDB-2018-01856] Journal Article
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A synchrotron X-ray and electron backscatter diffraction based investigation on deformation and failure micro-mechanisms of monotonic and cyclic loading in titanium
Synchrotron X-ray diffraction technique has been used to estimate defect structure in terms of dislocationdensity, crystallite size and micro-strain in commercially pure titanium subjected to tension and cyclic deformationin stress and strain control mode. Statistical analysis of micro-texture data collected from electronbackscatter diffraction approximately from the same region as that of synchrotron X-ray has been used to correlateorientation dependent micro-strain and dislocation density with deformation microstructure and microtexture.Two different orientations, namely, A with prismatic-pyramidal and B with basal orientation along theloading axis has been considered. [...]
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ddc:600
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2018-04-25
10:22
OpenAccess [PUBDB-2018-01848] Journal Article
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Influence of Annealing on Microstructure and Mechanical Properties of a Nanocrystalline CrCoNi Medium-Entropy Alloy
Materials 11(5), 662 () [10.3390/ma11050662]  GO
An equiatomic CrCoNi medium-entropy alloy was subjected to high-pressure torsion.This process led to a refinement of the microstructure to a grain size of about 50 nm, combined witha strong increase in the materials hardness. Subsequently, the thermodynamic stability of the mediumentropy alloy was evaluated by isothermal and isochronal heat treatments. [...]
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