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2018-10-15
17:08
[PUBDB-2018-03801] Journal Article
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Specifics of $\mathrm{C_{60}}$ Fullerene Cluster Formation in a Solvent Mixture of Toluene and N-Methyl-2-Pyrollidone
The two-level organization of $\mathrm{C_{60}}$ fullerene clusters in solutions of $\mathrm{C_{60}}$ in pure toluene and toluene/N-methyl-2-pyrrolidone solvent mixtures is studied by small-angle X-ray scattering (SAXS). The SAXS data for freshly prepared solutions are compared with the data obtained by dynamic light scattering, a technique we use to assess the temporal stability of the prepared solutions [...]
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ddc:540
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2018-10-12
13:15
[PUBDB-2018-03753] Journal Article
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High strength nanocrystalline Cu–Co alloys with high tensile ductility
A supersaturated single-phase Cu–26 at.% Co alloy was produced by high-pressure torsiondeformation, leading to a nanocrystalline microstructure with a grain size smaller than 100 nm.The nonequilibrium solid solution decomposed during subsequent isothermal annealing. In situhigh-energy X-ray diffraction was used to map changes linked to the separating phases, and thedevelopment of a nanoscale Cu–Co composite structure was observed. [...]
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ddc:670
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2018-10-09
11:33
[PUBDB-2018-03729] Journal Article
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Understanding precipitate evolution during friction stir welding of Al-Zn-Mg-Cu alloy through in-situ measurement coupled with simulation
Friction Stir Welding (FSW) imparts both heat and deformation to the metal being joined, producing profound microstructural changes that determine the weld properties. In the case of welding of aerospace aluminium alloys, the most important change is the modification of the size, nature, and fraction of strengthening precipitates. [...]
ddc:670
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2018-10-09
11:11
OpenAccess [PUBDB-2018-03728] Journal Article
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Texture and microstructure of HPT-processed Fe-based shape memory alloys
18th International Conference on Textures of Materials , ICOTOM-18, Meeting location, IOP conference series / Materials science and engineering 375, 012006 () [10.1088/1757-899X/375/1/012006]  GO
Texture and microstructure evolution of Fe-based shape memory alloys subjected to high pressure torsion (HPT) at room temperature was investigated using synchrotron radiation and electron backscatter diffraction in the scanning electron microscope. As starting material for HPT a directionally solidified Fe-based alloy characterized by a <100> fiber texture and coarse columnar grains with a mean size of about 300 μm was used. [...]
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ddc:530
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2018-10-09
10:18
[PUBDB-2018-03727] Journal Article
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Effect of heat treatment on the precipitation hardening in FeNiCoAlTaB shape memory alloys
In order to obtain optimal mechanical properties, the effect of heat treatment on the precipitation hardening in multicomponent Fe-based shape memory alloys (containing Ni, Co, Al, Ta, B) was studied. The polycrystalline material was investigated after application of three different processing schemas: slowly cooled, quenched and subsequently annealed with various aging conditions [...]
ddc:670
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2018-09-27
11:50
OpenAccess [PUBDB-2018-03650] Journal Article
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Phase Formation during Solidification of Mg-Nd-Zn Alloys: An In Situ Synchrotron Radiation Diffraction Study
Materials 11(9), 1637 () [10.3390/ma11091637]  GO
Mg-4Nd base alloys with Zn additions of 3, 5 and 8 wt % were investigated with in situ synchrotron radiation diffraction during solidification. This method enabled the investigation of phase formation and transformation in the alloys [...]
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ddc:600
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2018-09-27
11:44
[PUBDB-2018-03649] Journal Article
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The Effect of a Grain Boundary Pinning $B_2$ Phase on Polycrystalline Co-Based Superalloys with Reduced Density
The Al/W ratio was increased in a new polycrystalline $γ/γ′$ Co-based superalloy in order to introduce a grain boundary pinning phase while at the same time reducing the density and increasing the oxidation resistance. The grain boundary pinning phase was identified as $β$-phase (B2-(Ni,Co)Al) by high-energy X-ray diffraction [...]
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ddc:670
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2018-09-27
11:37
OpenAccess [PUBDB-2018-03648] Journal Article
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The Effect of Zn Content on the Mechanical Properties of Mg-4Nd-xZn Alloys (x = 0, 3, 5 and 8 wt.%)
Materials 11(7), 1103 () [10.3390/ma11071103]  GO
The mechanical properties of as-cast Mg-4Nd-xZn (x = 0, 3, 5 or 8 wt.%) alloys were investigated both in situ and ex situ in as-cast and solution-treated conditions. The additions of 3 or 5 wt.% Zn in the base Mg-4Nd alloy did not improve yield strength in comparison to the binary Mg-4Nd alloy [...]
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ddc:600
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2018-09-27
11:23
[PUBDB-2018-03646] Journal Article
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New insights into perovskite-Ti$_{3}$AlC precipitate splitting in a Ti-45Al-5Nb-0.75C alloy by transmission electron microscopy
The addition of carbon in TiAl alloys can improve the mechanical properties by precipitate hardening through the perovskite Ti$_3$AlC carbide. Usually precipitates coarsen during continuous annealing [...]
ddc:660
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2018-09-27
10:55
[PUBDB-2018-03642] Journal Article
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Strain energy contributions on the bainitic phase transformation in a CrMoV steel during continuous cooling
The bainitic phase transformation during continuous cooling in low alloyed steels is a complex process since many different reactions are taking place simultaneously. Since all of them are rather sensitive to the applied cooling rates, the present study investigates the mechanisms taking place during the bainitic phase transformation by using a comprehensive set of methods including in-situ high energy X-ray diffraction combined with dilatometry, ex-situ microstructure characterization by means of scanning and transmission electron microscopy including electron back scatter diffraction [...]
ddc:600
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