Materials Literature
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During twin-roll casting (TRC) of magnesium alloy AZ31 specific process conditions may promote the formation of inverse segregations. This phenomenon is characterized by pressing remaining melt, which is enriched with alloying elements, into small cavities within the rapidly solidified material at the chill surface. T…
Magnesium AZ31 (Mg-3 wt. % Al-1 wt. % Zn) alloy sheets were rolled at a high speed of 1000 m/min at 100 °C to reductions of 30% and 49%. Annealing was then conducted on the as-rolled specimens at temperatures of 200 °C and 350 °C for different times. The microstructure was characterized by optical microscopy and the m…
Magnesium alloying with calcium is very promising for mechanical strength. One of the promising al-loys systems is ternary Mg-Zn-Ca. Recent results by the first principles calculation suggest that the com-bination of calcium and zinc possibly enhances the cohesive energy of grain boundary. In this work, Mg-Zn-Ca alloy…
About the CoverLivermore researchers design and develop new materials with novel structures, functions, and properties.As the article beginning on p. 4 describes, the Department of Energy's Office of Basic Energy Sciences (BES) funds a portfolio of six materials research projects that are probing, manipulating, and si…
ADVERTISEMENT RETURN TO ISSUEPREVLetter to the EditorNEXTReply to "Comment on 'Metal Semiconductor Field-Effect Transistor with MoS2/Conducting NiOx van der Waals Schottky Interface for Intrinsic High Mobility and Photoswitching Speed'"Jin Sung Kim, Hee Sung Lee, and Seongil Im*View Author Information Institute of Phy…
La faible compliance et les propriétés de surface des prothèses vasculaires commerciales mènent à d’importantes complications cliniques, ce qui empêche leur utilisation pour le remplacement de vaisseaux sanguins de petit diamètre (inférieur à 6 mm). L’électrofilage est une méthode de fabrication de structures ayant le…
Numerical prediction of multiscale heat transfer is a challenging problem due to the wide range of time and length scales involved. In this work a discrete unified gas kinetic scheme (DUGKS) is developed for heat transfer in materials with different acoustic thickness based on the phonon Boltzmann equation. With discr…
Simple implementation of a Python algorithm that finds circular particles in SEM images and fits a circle. Results are saved to .csv files and the fits can be checked by hand via an easy interface.
This Ph.D. thesis is focused on the fabrication and electrical and physicochemical characterization of metal gates in 14 nm high-K based FDSOI MOSFET devices, manufactured at STMicroelectronics. These metal gates are composed of TiN, lanthanum and aluminum layers, deposited by RF sputtering. Test structures and a simp…
ADVERTISEMENT RETURN TO ISSUEPREVAddition/CorrectionNEXTORIGINAL ARTICLEThis notice is a correctionCorrection to Tetraphenylhexaazaanthracenes: 16π Weakly Antiaromatic Species with Singlet Ground StatesChristos P. Constantinides, Georgia A. Zissimou, Andrey A. Berezin, Theodosia A. Ioannou, Maria Manoli, Demetra Tsokk…
Significance and Use 5.1 It is known that contamination by water can affect the structural stability of some greases in service. The test procedure specified in this method is widely used to determine the wet structural stability of greases in service. Ma
Magnesium based materials are effective for structural/component weight reduction in automotive applications. However, their real time applications are limited because of their inadequate mechanical properties, especially the absolute strength and creep resistance. In this regard, the formation of thermally stable ter…
In recent years Mg-Zn-Y series alloys have drawn significant interest due to their superior mechanical properties. The addition of yttrium to the Mg-Zn alloy leads to the formation of a special phase (Mg12YZn) with a long-period stacking ordered (LPSO) structure, which plays an important strengthening role. The main o…
The mechanism of magnesia production was investigated experimentally in reversion reaction process in vacuum. The results showed that the reversion reactions were exothermic reaction, the gas-phase reversion will commence as soon as a saturated gas mixture was cooled down. MgO and Mg2C3 were detected in the condensing…
The poor corrosion performance of Mg alloys stems from the non–protectiveness of their surface films. It is important to understand how the corrosion resistance of surface films is affected by their composition and microstructure. This paper reports on the Mg surface film microstructure and its dependence on polarizat…
This chapter indicates that recent successful alloy-design showed that Mg alloys with addition of a little amount of Zn and Y reveal excellent mechanical properties, which include remarkably improved strength with a reasonable ductility. To accelerate further developments of the alloys, it becomes important to underst…
An accurate description of the deformation response of AZ31 Mg under changing strain paths requires consideration of its strong anisotropy and its evolution with accumulated plasticdeformation. The general held belief is that without modeling de-twining it is impossible todescribe the effect of the pre-strain on harde…
Magnesium has been recently becoming an increasingly popular material for various applications. However, excessive chemical reactivity, and oxidation rate in particular, is a major obstruction on the way of Mg to become widely adopted. A significant problem causing the lack of Mg reactivity control is insufficient und…
High pressure die casting (HPDC) is the predominant manufacturing method for magnesium alloy automotive components. Cooling rates during HPDC may reach 300°C/s; however, the phase transformation kinetics in this regime are poorly understood. In this study, a description of microsegregation in HPDC AM70 is ob-tained by…
In this study, we investigated the effect of aging treatment at 573 K on hardness in Mg-Sc alloy with bcc/hcp dual phase prepared by annealing at 873 K. It was found that hardness abruptly increased after some incubation time, and then reached steady state level. Moreover, by further aging, the hardness increased agai…