scholarly journals Micromechanical modelling of the elastic–viscoplastic response of metallic alloys under rapid compression in the semi-solid state

2011 ◽  
Vol 59 (3) ◽  
pp. 1271-1280 ◽  
Author(s):  
V. Favier ◽  
H.V. Atkinson
Keyword(s):  
Solid State ◽  
Metallic Alloys ◽  
Micromechanical Modelling ◽  
Rapid Compression ◽  
Semi Solid

TEM study of amorphization of Cu and Ti foils by cold-rolling

1990 ◽  
Vol 48 (4) ◽  
pp. 146-147
Author(s):  
W. A. Chiou ◽  
N. L. Jeon ◽  
Genbao Xu ◽  
M. Meshii
Keyword(s):  
Solid State ◽  
Cold Rolling ◽  
High Energy ◽  
Rapid Quenching ◽  
Vapor Condensation ◽  
Metallic Alloys ◽  
Solid State Reactions ◽  
High Energy Particle ◽  
Amorphous Metallic Alloys ◽  
Thin Foils

For many years amorphous metallic alloys have been prepared by rapid quenching techniques such as vapor condensation or melt quenching. Recently, solid-state reactions have shown to be an alternative for synthesizing amorphous metallic alloys. While solid-state amorphization by ball milling and high energy particle irradiation have been investigated extensively, the growth of amorphous phase by cold-rolling has been limited. This paper presents a morphological and structural study of amorphization of Cu and Ti foils by rolling.Samples of high purity Cu (99.999%) and Ti (99.99%) foils with a thickness of 0.025 mm were used as starting materials. These thin foils were cut to 5 cm (w) × 10 cm (1), and the surface was cleaned with acetone. A total of twenty alternatively stacked Cu and Ti foils were then rolled. Composite layers following each rolling pass were cleaned with acetone, cut into half and stacked together, and then rolled again.

Stand-Alone Semi-Solid-State Electrochemical Systems Based on Bicontinuous Microemulsion Gel Films

2020 ◽  
Vol 92 (20) ◽  
pp. 14031-14037
Author(s):  
Hinako Hashimoto ◽  
Kyosei Goto ◽  
Kouhei Sakata ◽  
Satoshi Watanabe ◽  
Tomoyuki Kamata ◽  
...  
Keyword(s):  
Solid State ◽  
Electrochemical Systems ◽  
Bicontinuous Microemulsion ◽  
Semi Solid ◽  
Microemulsion Gel

Experimental Investigations And Numerical Modelling of 210CR12 Steel in Semi-Solid State

2011 ◽  
Author(s):  
Piotr Macioł ◽  
Władysław Zalecki ◽  
Roman Kuziak ◽  
Aleksandra Jakubowicz ◽  
Stanisław Węglarczyk
Keyword(s):  
Solid State ◽  
Numerical Modelling ◽  
Experimental Investigations ◽  
Semi Solid

Mechanical Properties of Thixoformed 7075 Feedstock Produced via the Direct Thermal Method

2015 ◽  
Vol 651-653 ◽  
pp. 1569-1574 ◽  
Author(s):  
Asnul Hadi Ahmad ◽  
Sumsun Naher ◽  
Dermot Brabazon
Keyword(s):  
Mechanical Properties ◽  
Tensile Strength ◽  
Solid State ◽  
Tensile Testing ◽  
Thermal Method ◽  
Test Unit ◽  
Pouring Temperature ◽  
Injection Test ◽  
Semi Solid ◽  
Conventionally Cast

Abstracts: This paper presents an overview of measured mechanical properties of thixoformed aluminium 7075 feedstock produced by the direct thermal method (DTM). The DTM feedstock billets were processed with a pouring temperature of 685 °C and holding periods of 20 s, 40 s and 60 s before being quenched and subsequently thixoformed. A conventionally cast feedstock billet was produced with a pouring temperature of 685 °C and was allowed to solidify without quenching. The feedstock billets were later formed by an injection test unit in the semi-solid state. Tensile testing was then conducted on the thixoformed feedstock billets. Tensile properties for 7075 DTM thixoformed feedstock billets were found significantly influenced by the thixoformed component density. Samples with longer holding times were found to have higher density and higher tensile strength.

Investigation into the rapid compression of semi-solid alloy slugs

2001 ◽  
Vol 111 (1-3) ◽  
pp. 31-36 ◽  
Author(s):  
P. Kapranos ◽  
T.Y. Liu ◽  
H.V. Atkinson ◽  
D.H. Kirkwood
Keyword(s):  
Solid Alloy ◽  
Rapid Compression ◽  
Semi Solid

Evaluation of Strip Rolling Directly from the Semi-Solid State

2006 ◽  
Vol 116-117 ◽  
pp. 433-436 ◽  
Author(s):  
Antonio de Pádua Lima Filho ◽  
Márcio Iuji Yamasaki
Keyword(s):  
Solid State ◽  
Cooling System ◽  
Solid Alloy ◽  
Strip Rolling ◽  
Tin Alloys ◽  
Cooling Slope ◽  
Quality Issue ◽  
Lower Roller ◽  
Semi Solid ◽  
Strip Quality

The aim of this work is to study the solidification conditions necessary to produce good quality/low defect metal alloy strip when thixorolling directly from the semi-solid state. To facilitate the study lead/tin alloys were chosen for their relatively low operating temperature. The objective is to extrapolate these findings to the higher temperature aluminium alloys. Three alloys (70%Pb- 30%Sn, 60%Pb-40%Sn, 50%Pb-50%wtSn) were used particularly to study the influence of the solidification interval. The equipment consists of a two roll mill arranged as an upper and lower roller, where both rollers are driven at a controlled speed. The lower roller is fed with semi solid alloy through a ceramic nozzle attached to the lower end of a cooling slope. Several types of nozzle and their position at the roller were tested. This produced different solidifications and consequently different finished strip. The alloys were first cast and then poured onto the cooling slope through a tundish in order to create a continuous laminar flow of slurry and uniformity of metal strip quality. The pouring was tested at different positions along the slope. The cooling slope was coated with colloidal graphite to promote a smooth slurry flow and avoid the problem of adherence and premature solidification. The metallic slurry not only cools along the slope but is also initially super-cooled to a mush by the lower roller whilst at room temperatures, thus enabling thixorolling. It was also found that the nozzle position could be adjusted to enable the upper roller to also contribute to the solidification of the metallic slurry. However the rollers and the cooling slope naturally heat up. Temperature distribution in these zones was analysed by means of three thermocouples positioned along the cooling slope and a fourth in the base of the semi solid pool within the nozzle. The objective being to design an optimum pouring and cooling system. The formed strip was cooled down to room temperature with a shower of water. Microstructures of the thixorolling process were analysed. The differences in solidification conditions resulted in differing qualities of finished strip and corresponding defect types, all of which are a serious quality issue for the rolled product.

Microstructural evolution of an ECAE-formed ZK60-RE magnesium alloy in the semi-solid state

2009 ◽  
Vol 506 (1-2) ◽  
pp. 8-15 ◽  
Author(s):  
Zude Zhao ◽  
Qiang Chen ◽  
Yanbin Wang ◽  
Dayu Shu
Keyword(s):  
Solid State ◽  
Magnesium Alloy ◽  
Microstructural Evolution ◽  
Semi Solid
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