scholarly journals Effect of angle, length and circulation cooling system on microstructure A360 Aluminum alloy in semi-solid metal forming by cooling slope method

2017 ◽  
pp. 9-14 ◽  
Author(s):  
Mohammad Mahdi Kaykha
Keyword(s):  
Aluminum Alloy ◽  
Metal Forming ◽  
Cooling System ◽  
Solid Metal ◽  
Cooling Slope ◽  
Slope Method ◽  
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.

scholarly journals Transient Liquid Phase Bonding of Semi-Solid Metal 7075 Aluminum Alloy using ZA27 Zinc Alloy Interlayer

Metals ◽  
2018 ◽  
Vol 8 (8) ◽  
pp. 637 ◽  
Author(s):  
Chaiyoot Meengam ◽  
Yongyuth Dunyakul ◽  
Dech Maunkhaw ◽  
Suppachai Chainarong
Keyword(s):  
Aluminum Alloy ◽  
Liquid Phase ◽  
Bonding Strength ◽  
Transient Liquid Phase ◽  
Solid Metal ◽  
Bonding Time ◽  
Zinc Alloy ◽  
Transient Liquid Phase Bonding ◽  
Bonding Zone ◽  
Semi Solid

Transient Liquid Phase Bonding (TLPB) process of semi-solid metal 7075 aluminum alloys (SSM7075) using 50 μm thick of ZA27 zinc alloys as interlayers for the experiment were carried out under bonding temperatures of 480 and 540 °C and bonding times of 30, 60, 90 and 120 min respectively. In the bonding zone, the semi-solid state of ZA27 zinc alloy interlayers were diffused into the SSM7075 aluminum alloy. Examination of the bonding zone using Scanning Electron Microscope (SEM) and Energy-dispersive X-ray spectroscopy (EDS) showed that the precipitation of the intermetallic compound of η(Zn–Al–Cu), β(Al2Mg3Zn3), T′(Zn10Al35Cu55) and MgZn2 were formed in the bonding zone. The better homogenized microstructure in the bonding zone was formed when increasing bonding time and bonding temperature. The highest bonding strength was recorded at 17.44 MPa and average hardness was at 87.67 HV with the bonding time of 120 min and temperature at 540 °C. Statistically, the coefficient of determination analysis of bonding strength data was at 99.1%.

Formation of Globular Microstructure in A380 Aluminum Alloy by Cooling Slope Casting

2011 ◽  
Vol 264-265 ◽  
pp. 272-277 ◽  
Author(s):  
Nurşen Saklakoğlu ◽  
S. Gencalp ◽  
Şefika Kasman ◽  
İ.E. Saklakoğlu
Keyword(s):  
Aluminum Alloy ◽  
Slope Angle ◽  
Casting Process ◽  
Solid Particles ◽  
Inclined Plate ◽  
Pouring Temperature ◽  
Cooling Slope ◽  
Semi Solid ◽  
Cooling Slope Casting ◽  
The Many

Thixoforming and related semi-solid processing (SSP) methods require thixotropic materials. One of the many SSP techniques is the cooling slope (CS) casting process, which is simple and has minimal equipment requirements, and which is able to produce feedstock materials for semisolid processing. When the feedstock is reheated to the semisolid temperature range, non-dendritic, spheroidal solid particles in a liquid matrix suitable for thixoforming are obtained. In this study, equipment for the CS technique was first established, and then the effects of the pouring temperature and inclined slope angle on the microstructures of A380 aluminum alloy (ISOAlSi8Cu3Fe) were studied. Optimum parameters for thixoforming experiments were selected, and it was found that the microstructure produced by the inclined plate depended on its angle and the pouring temperature.

scholarly journals Thermal stability of laser treated die material for semi-solid metal forming

2009 ◽  
Vol 2 (S1) ◽  
pp. 761-764 ◽  
Author(s):  
S. N. Aqida ◽  
M. Maurel ◽  
D. Brabazon ◽  
S. Naher ◽  
M. Rosso
Keyword(s):  
Thermal Stability ◽  
Metal Forming ◽  
Solid Metal ◽  
Die Material ◽  
Semi Solid ◽  
Thermal Stability Of

Semi-Solid Metal Processing of Aluminum Alloy A390

2002 ◽  
Author(s):  
Stephen Midson ◽  
Jay Keist ◽  
Jeff Svare
Keyword(s):  
Aluminum Alloy ◽  
Solid Metal ◽  
Metal Processing ◽  
Semi Solid

Semi-Solid Metal Processing – A Process Looking for a Market

2008 ◽  
Vol 141-143 ◽  
pp. 1-8 ◽  
Author(s):  
Plato Kapranos
Keyword(s):  
Metal Forming ◽  
Solid Metal ◽  
Typical Case ◽  
Managerial Decisions ◽  
Human Scale ◽  
Patent Rights ◽  
Innovative Idea ◽  
Metal Processing ◽  
Semi Solid ◽  
The One

The birth of Semi-Solid Metal Forming (SSM) or as it has now come to be widely known, Thixoforming, is a typical case of development of a technological innovation. Serendipity, stroke of luck, call it what you may, the beginning of SSM is based on an almost accidental discovery by a student carrying out a series of meticulous experiments. On the one hand, some technological failures have contributed to the lack of success across the board for SSM technologies. On the other hand, the ‘long childhood’ of the resulting technology or the process of moving from ‘Innovative Idea to Market' has been largely the result of difficult and in hindsight sometimes wrong managerial decisions, occasional personality clashes, patent rights and at times unavoidable all out business 'warfare'. Of course, hindsight is beautiful but unfortunately it always comes after the event. However, if one looks carefully at some of the notable successes of SSM forming one can discern that the problems were more on the human scale; people failures rather than technology failures. This paper aims to bring out some of these points by outlining the historical development of Thixoforming.

scholarly journals R-HPDC in South Africa

2012 ◽  
Vol 192-193 ◽  
pp. 3-15 ◽  
Author(s):  
Ulyate Andries Curle ◽  
Heinrich Möller ◽  
Gonasagren Govender
Keyword(s):  
South Africa ◽  
Metal Forming ◽  
Solid Metal ◽  
Matrix Composites ◽  
Purity Aluminium ◽  
Binary Eutectic ◽  
History Of ◽  
High Purity Aluminium ◽  
Semi Solid ◽  
Pressure Die Casting

The history of semi-solid metal forming and in particular rheo-high pressure die casting at the Council for Scientific and Industrial Research in South Africa is discussed. Processing flexibility is demonstrated on the Al-Si-Mg, Al-Mg-Si, Al-Cu-Mg and Al-Zn-Mg-Cu casting and wrought alloy systems as well as on high purity aluminium, unmodified Al-Si binary eutectic, metal matrix composites and magnesium alloys. Material properties are highlighted.

Industrial Applications of Rheoforming Technology in China

2012 ◽  
Vol 192-193 ◽  
pp. 36-46
Author(s):  
W.C. Keung ◽  
Xiang Jie Yang ◽  
Wei Wei Shan
Keyword(s):  
Metal Forming ◽  
Academic Research ◽  
Industrial Applications ◽  
Solid Metal ◽  
Current Status ◽  
Forming Process ◽  
Metal Forming Process ◽  
Semi Solid ◽  
China Mainland ◽  
Rheological Forming

Rheological forming, a semi-solid metal forming process, is one of the manufacturing technologies for near net shape forming. The technology has attracted global academic research interests in recent years. This paper presents the current status of industrial applications of the semi-solid rheological forming technology in the China mainland. A variety of semi-solid slurry preparation techniques have been adopted including electromagnetic stirring and low superheat pouring. Dedicated semi-solid rheological forming equipment developed by the local manufacturers have been highlighted. This paper also makes an attempt to review the crucial factors for successful industrial application of the semi-solid metal forming process.

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