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Conventional diffusion bonding is normally conducted under constant bonding pressure, resulting in obvious deformation of the joined component, thereby destroying the internal structures. To address this problem, this study proposed a two-stage variable pressure diffusion bonding to fabricate the high-precision steel hollow structural component. In the first stage, a short-time higher bonding pressure...
The influence of temperature ramping ageing treatment on the microstructure and mechanical properties of Al-Zn-Mg alloy was investigated. When the final temperature was higher than 180°C, the hardness of the alloy improved with increase of the ramping rate. It increased and then decreased with increase of the ramping rate when the final temperature ranged from 180°C to 200°C. The tensile strength...
An ultrafine-grained surface layer of a pure Mg sheet was fabricated by sliding friction treatment. The grain size of the surface for the treated sample was reduced to 300 nm from 50 μm for the as-received counterpart. The ultrafine-grained pure Mg shows significantly enhanced corrosion resistance compared to its coarse-grained counterpart, representing a lower mass loss, a higher polarization resistance...
We describe the effect of varying tension leveling parameters on the microstructure and mechanical properties of steel strips. We found that, when the tension leveling elongation was constant, an increase in the screw-down value resulted in an initial decrease in the cross-sectional grain size of the strip, which was followed by an increase. However, the longitudinal grain size remained constant,...
Precipitation simulation of AZ91 (Mg-9Al-1Zn; all compositions are in wt.% unless otherwise stated.) magnesium alloy is carried out in this work using the PanPrecipitation module of Pandat™ software. In addition to the software, the thermodynamic database, mobility database, and precipitation database for AZ91 were developed to perform the simulation. The simulated results, such as the number density...
Computer aided materials design is of increasing interest because the conventional approach solely relying on experimentation is no longer viable within the constraint of available resources. Modeling of microstructure and mechanical properties during precipitation plays a critical role in understanding the behavior of materials and thus accelerating the development of materials. Nevertheless, an...
Thermodynamic modeling of precious-metal-modified Ni-based super-alloys (PMMS) was performed in this study using the CALPHAD approach. With this approach, the effects of platinum-group metals (PGMs) such as platinum, iridium, and ruthenium on the properties of nickel-based superalloys and their interplay with other alloying elements were understood from a thermodynamic and phase equilibrium point...
The thermodynamic description of the Mg-Al-Ca-Sr quaternary system in the magnesium-rich region was developed on the basis of the authors’ previous work on the key constituent ternaries, such as Mg-Al-Ca and Mg-Al-Sr systems. Using this description coupled with the Scheil model, the calculated solidification paths of several Mg-Al-Sr ternary alloys and Mg-Al-Ca-Sr quaternary alloys are in good accordance...
A variety of lead-free solder alloys were studied for use as flip-chip interconnects including Sn-3.5Ag, Sn-0.7Cu, Sn-3.8Ag-0.7Cu, and eutectic Sn-37Pb as a baseline. The reaction behavior and reliability of these solders were determined in a flip-chip configuration using a variety of under-bump metallurgies (TiW/Cu, electrolytic nickel, and electroless Ni-P/Au). The solder micro-structure and intermetallic...
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