Liquid State Forging: Novel Potentiality to Produce High Performance Components, Process, Plant and Tooling

2007 ◽  
Author(s):  
M. Rosso ◽  
A. Zago ◽  
P. Claus ◽  
P. Motoiu
Keyword(s):  
Liquid State ◽  
High Performance ◽  
Process Plant

Effect of the Mg3N2 Sub-Micron Particle on the Grain Refinement of AZ80 Alloy

2022 ◽  
Vol 327 ◽  
pp. 45-53
Author(s):  
Jiehua Li ◽  
Maria Pammer ◽  
Ernst Neunteufl ◽  
Peter Schumacher
Keyword(s):  
Mechanical Properties ◽  
Grain Size ◽  
Grain Refinement ◽  
Liquid State ◽  
High Performance ◽  
Great Loss ◽  
Micron Particle ◽  
Deformation Ability ◽  
Semi Solid ◽  
Az80 Alloy

AZ80 alloy has been widely used to produce high performance Mg casting and wrought parts for high-end applications due to its high mechanical properties and deformation ability. However, at least two important issues still need to be solved in order to further improve its mechanical properties and deformation ability. Firstly, the grain size of α-Mg in AZ80 alloy is relatively large (more than 1000 µm) due to a lack of efficient grain refinement methodologies. Secondly, the size of the eutectic Mg17Al12 phase is also large and the distribution of the eutectic Mg17Al12 phase is continuous, which is very harmful for the mechanical properties, in particular to elongation. In this paper, these two important issues are investigated by adding Mg3N2 sub-micron particle into AZ80 alloy and thereby refining the α-Mg and the eutectic Mg17Al12 phase. Firstly, the Mg3N2 sub-micron particle was directly added into AZ80 alloy by using mechanically stirring in the semi-solid state, subsequently the melting temperature was increased above the liquidous temperature, and finally the melting was casted in the liquid state. It was found that the grain size of α-Mg can be refined from 883.8 µm to 169.9 µm. More importantly, the eutectic Mg17Al12 phase was also refined and the distribution became discontinuous. It should be noted that directly adding the Mg3N2 sub-micron particle into AZ80 alloy leads to a great loss of the Mg3N2 sub-micron particle due to the weak wetting behavior between the Mg3N2 sub-micron particle and Mg melt. The second methodology through mixing Mg3N2 sub-micron particles with AZ91 chips using a twin extruder was also used to prepare AZ91 master alloy with 3wt.% Mg3N2 sub-micron particle, which was subsequently added into AZ80 alloy in the liquid state. In this way, a significant grain refinement of α-Mg and a simultaneous refinement of the eutectic Mg17Al12 phase in AZ80 alloy was also achieved. The grain size of α-Mg can be refined from 883.8 µm to 325.9 µm. However, no significant grain refinement by using UST was observed. Instead, the grain size increases from 325.9 µm to 448.6 µm, indicating that the Mg3N2 sub-micron particle may lose its grain refinement potency due to possible aggregation and clustering. This paper provides an efficient and simple methodology for the grain refinement of α-Mg and the simultaneous refinement of the eutectic Mg17Al12 phase in AZ80 alloy.

Pre-Service Component Testing of Steam Power and Process Plant

1970 ◽  
Vol 185 (1) ◽  
pp. 229-240 ◽  
Author(s):  
A. J. Morton
Keyword(s):  
High Performance ◽  
Ad Hoc ◽  
Test Facility ◽  
Financial Loss ◽  
Steam Power ◽  
Component Testing ◽  
Process Plant ◽  
High Incidence ◽  
Adequate Test ◽  
Accurate Record

The high performance increasingly required of modern plant leaves smaller margins for error in design and makes the plant more sensitive to unforeseen phenomena. This shows itself in many industries in a high incidence of teething trouble, bringing heavy financial loss to the purchaser and discouraging further innovation. The remedy is more thorough design and development and, wherever possible, the full-scale on-load prototype testing of complete plant items before delivery, so as to expose and eliminate teething troubles and to provide the designer with an accurate record of the behaviour of the plant. It is in the purchaser's interest to make such testing a requirement of the contract. Adequate test facilities are at present lacking and can seldom be provided by individual manufacturers. A permanent fully equipped test facility has great advantages compared with ad hoc testing arrangements in various locations, and the paper proposes the establishment of publicly operated testing and development stations to serve various industries. The equipment and procedure of such a station to serve the steam power and allied industries are examined.

Design of a High Performance Thin All-Solid-State Supercapacitor Mimicking the Active Interface of Its Liquid-State Counterpart

2013 ◽  
Vol 5 (24) ◽  
pp. 13397-13404 ◽  
Author(s):  
Bihag Anothumakkool ◽  
Arun Torris A. T. ◽  
Siddheshwar N. Bhange ◽  
Sreekuttan M. Unni ◽  
Manohar V. Badiger ◽  
...  
Keyword(s):  
Solid State ◽  
Liquid State ◽  
High Performance

High performance electrocatalyst consisting of CoS nanoparticles on an organized mesoporous SnO2 film: its use as a counter electrode for Pt-free, dye-sensitized solar cells

Nanoscale ◽  
2015 ◽  
Vol 7 (2) ◽  
pp. 670-678 ◽  
Author(s):  
Jung Tae Park ◽  
Chang Soo Lee ◽  
Jong Hak Kim
Keyword(s):  
Solar Cells ◽  
Liquid State ◽  
High Performance ◽  
Counter Electrode ◽  
Dye Sensitized Solar Cells ◽  
High Energy ◽  
Dye Sensitized ◽  
Conversion Efficiencies ◽  
Sensitized Solar Cells ◽  
Mesoporous Sno2

A high performance electrocatalyst was prepared based on CoS nanoparticles on an organized mesoporous SnO2 platform. High energy conversion efficiencies of 6.6% and 7.5% were demonstrated in solid and liquid state, Pt-free dye-sensitized solar cells (DSSCs), respectively.

A High Performance Energy Analyzer for Use in Electron Scanning Microscopy

1969 ◽  
Vol 27 ◽  
pp. 14-15
Author(s):  
A. V. Crewe ◽  
M. Isaacson ◽  
D. Johnson
Keyword(s):  
High Performance ◽  
Vertical Plane ◽  
Median Plane ◽  
Electron Gun ◽  
Uniform Field ◽  
Loss Mechanism ◽  
Electron Scanning Microscopy ◽  
Sector Type ◽  
Double Focusing ◽  
Electron Energy Loss

A double focusing magnetic spectrometer has been constructed for use with a field emission electron gun scanning microscope in order to study the electron energy loss mechanism in thin specimens. It is of the uniform field sector type with curved pole pieces. The shape of the pole pieces is determined by requiring that all particles be focused to a point at the image slit (point 1). The resultant shape gives perfect focusing in the median plane (Fig. 1) and first order focusing in the vertical plane (Fig. 2).

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