Materials Literature
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This paper investigates the microstructure, mechanical properties and creep behavior of Mg–Al–Ca alloys with different Ca content. SEM and EDAX analyses show that the dominant second phase in the as-cast Mg–Al–Ca alloys is Al2Ca, which distributes at the grain boundaries and disperses in the grain interior as well. Bo…
In modern car concepts the aspect of lightweight constructions becomes more and more important. Lightweight materials, as aluminum and magnesium, get in the spotlight, thereby. Particularly because of the enormous potential for lightweight constructions industrial interests in magnesium wrought- and casting materials…
A buckling instability of chains of isotropic droplets in smectic films is investigated. The c -director field in a free-standing film is prepared as a target pattern with a continuous radial deformation. In such a pattern, isotropic liquid droplets are induced by light irradiation of the photochromic mesogenic materi…
High-performance true zero-order optical retarders were realized based on all-dielectric immersion nanogratings. All-dielectric nanolaminate materials, deposited by atomic layer deposition, were utilized to fill the trenches of the nanogratings to form immersion nanogratings. The refractive index of the nanolaminate m…
Fully-reversed total-strain-amplitude-controlled fatigue tests were performed in laboratory air at room temperature for the magnesium alloy AZ91. Experimental results showed that during the experiment significant cyclic strain hardening occurred throughout the imposed strain amplitudes. It was found that the relations…
Twin roll casting has been used to produce AZ31 magnesium alloy strip. The size of the cast strip is 5mm thick and 250mm wide. The microstructure of the as-cast AZ31 alloy strip consists of columnar zones from the surface to mid-thickness region and equiaxed zones in the mid-thickness region. The secondary dendrite ar…
This paper consists of a review of investigations and the factors affecting the fatigue of Mg and its alloys. The effect of materials, loading conditions and environmental factors on fatigue is discussed in detail. Particular attention has been paid to the influence of frequencies and the pH value of solutions on the…
Particle-stimulated nucleation (PSN) was investigated in magnesium alloy AZ31 to study the effect of the evolution of second-phases during extrusion and other metal forming processes. Compression tests were carried out on samples taken from coarse-grained as-cast magnesium alloy billets containing a lamellar Mg17All2…
Electronic state calculations are performed self-consistently using the extended Hückel-type nonorthogonal tight-binding method for two different oxygen configurations (backbonded and double-bonded oxygen configurations) on the H-covered surface of spherical Si35H36, Si47H60, Si71H84, Si136H120, Si148H120, and Si172H1…
Temperature-dependent resistivity, thermoelectric power, and magnetoresistance (MR) are investigated in YBa2Cu3O7∕La0.7Sr0.3MnO3 (YBCO/LSMO) bilayers with the thickness of YBCO fixed at 150 nm and that of LSMO varying from t=0 to 50 nm. It is found that the onset temperature Tc of the superconducting transition retain…
Comparing the formability with each other, extrusion and various rolling experiments were carried out to make fine-grained AZ31 Mg sheets, and uni-axial tensile tests were carried out at different strain rates and temperatures to investigate the effect of different variables. A warm deep drawing tool setup with heatin…
Magnesium has a hexagonal close-packed crystal structure which makes it more difficult to deform than aluminum. Conventional strip production usually requires several process steps to reach the final strip thickness. Strip casting can reduce some of the process steps and make strip processing simpler and easier, espec…
The $4f$ photoemission spectra of atomically rough $\mathrm{Re}(12\overline{3}1)$ have been measured using synchrotron radiation. A surface core level shift of 0.17 eV towards higher binding energy than the bulk is obtained, and is supported by measurements at different photon energies and emission angles. This surfac…
Thixocasting is a new semi-solid processing route for magnesium alloys; it is claimed that finer microstructures can be produced and as a consequence, better corrosion resistance can be achieved. Therefore, it is of great interest to compare the corrosion properties of two Mg-Zn-RE alloys produced by standard squeeze…
Biologische Template: Diatomeenzellwände wurden mit Metallfilmen überzogen und anschließend aufgelöst, was nanostrukturierte Metallmikroschalen mit den Strukturmerkmalen der Diatomeentemplate lieferte. Wegen ihrer einzigartigen Nanostrukturdetails (siehe Bild) sind diese Mikroschalen nützliche Substrate für die oberfl…
Aluminum arc spray process was employed to form an aluminum coating on AZ31 magnesium alloy substrate. Anti-corrosion property of the Al-coated specimens was evaluated by salt immersion tests and electrochemical tests. There was no apparent inter-layer diffusion or compound layer formation between the aluminum coating…
A novel deep cryogenic treatment is presented to relieve residual stresses in 7050 aluminum alloy parts, in which the parts are submerged in liquid nitrogen and uphill quenched in proprietary QCW-01 quenchant. The optimum parameters of uphill quenching process were concluded in an attempt to combine maximum stress rel…
Neutron diffraction has been used to study the progress of deformation twinning and intergranular strain evolution in extruded magnesium during cyclic and monotonic loading at two temperatures. Differences in the intergranular strains generated during tensile and compressive tests are attributed to the operation of tw…
The electronic structure and the magnetic properties of ${\mathrm{Mn}}_{3}\mathrm{Ga}\mathrm{N}$ are studied as a function of lattice constant and are compared with those of ${\mathrm{Mn}}_{4}\mathrm{N}$. The local moments on the Mn atom in ${\mathrm{Mn}}_{3}\mathrm{Ga}\mathrm{N}$ and the face centered Mn atoms in ${\…
The effect of Jahn-Teller (JT) interactions on specific heat and magnetic properties was studied for the series of ${\mathrm{La}}_{1\ensuremath{-}x}{\mathrm{Ca}}_{x}\mathrm{Mn}{\mathrm{O}}_{3}$ $(0.55\ensuremath{\leqslant}x\ensuremath{\leqslant}0.87)$ compounds by measurements of specific heat, ultrasonic velocity, an…