Mechanical properties and their microstructure evaluation in the thixoforming process of semi-solid aluminum alloys

2000 ◽  
Vol 105 (3) ◽  
pp. 269-277 ◽  
Author(s):  
W.G Cho ◽  
C.G Kang
Keyword(s):  
Mechanical Properties ◽  
Aluminum Alloys ◽  
Solid Aluminum ◽  
Microstructure Evaluation ◽  
Semi Solid

scholarly journals Development of in-situ measuring methods for mechanical properties on semi-solid aluminum alloy

2011 ◽  
Vol 61 (4) ◽  
pp. 135-141 ◽  
Author(s):  
Hiroyuki Chiba ◽  
Toru Ueki ◽  
Takanari Toriyama ◽  
Itaru Endo ◽  
Takamitsu Kobayashi ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Aluminum Alloy ◽  
Solid Aluminum ◽  
Measuring Methods ◽  
Semi Solid

Reduction of Hot Tearing of Cast Semi-Solid 206 Alloys

2012 ◽  
Vol 192-193 ◽  
pp. 101-106 ◽  
Author(s):  
Alain Lemieux ◽  
Joseph Langlais ◽  
X. Grant Chen
Keyword(s):  
Mechanical Properties ◽  
Aluminum Alloys ◽  
Silicon Content ◽  
Hot Tearing ◽  
Silicon Concentration ◽  
Conventional Casting ◽  
Superior Mechanical Properties ◽  
High Silicon ◽  
Semi Solid

The mechanical properties of 206 alloys are among the highest of aluminum alloys. However, these alloys are usually prone to hot tearing. It is known that the addition of silicon can reduce the hot tearing propensity and improve fluidity. However, the commercial 206 alloys used in conventional casting processes limit the silicon concentration ≤0.05 wt% to obtain good mechanical properties. However, the semi-solid forming offers a unique opportunity to increase the silicon content to improve the castability without compromise on mechanical properties. In the present paper, the development of modified 206 alloy compositions to minimize hot tearing during semi-solid forming while maintaining competitive mechanical properties is reported. The effect of high silicon contents with varying copper levels on hot tearing sensitivity is studied. The mechanical properties of a high Si 206 alloy with lowest hot tearing sensitivity are evaluated. It is found that increasing the silicon content in 206 alloys is beneficial to reduce hot tearing. The high Si 206 variants produced by the SEED rheocating process not only reduce significantly the hot tearing sensitivity but also attain superior mechanical properties.

Parameter Estimation for Semi-Solid Aluminum Alloys Using Transient Experiments

2006 ◽  
Vol 116-117 ◽  
pp. 429-432 ◽  
Author(s):  
Andreas N. Alexandrou ◽  
Georgios Georgiou ◽  
N. Tonmukayakul ◽  
Diran Apelian
Keyword(s):  
Parameter Estimation ◽  
Aluminum Alloys ◽  
Rheological Properties ◽  
Solid Aluminum ◽  
Material Constants ◽  
Transient Experiments ◽  
Self Consistent ◽  
Semi Solid

A rotating vane-cup rheometer is used to determine the rheological properties of semi-solid slurries, and a procedure is established for characterizing the rheology with emphasis given to the proper and self-consistent evaluation of the material constants.

Microstructure and Mechanical Properties of Al Alloys by Semi-Solid Processing with LSPSF Technology

2009 ◽  
Vol 628-629 ◽  
pp. 477-482 ◽  
Author(s):  
Hong Min Guo ◽  
Xiang Jie Yang ◽  
J.X. Wang
Keyword(s):  
Mechanical Properties ◽  
Aluminum Alloys ◽  
Die Casting ◽  
High Strength ◽  
Casting Process ◽  
Homogeneous Distribution ◽  
Casting Alloy ◽  
Die Casting Process ◽  
Casting Industry ◽  
Semi Solid

Rheoforming is becoming the choice of the casting industry which relies on the semi-solid slurry for high integrity structural parts. The potential of rheoforming with LSPSF (Low superheat pouring with a shear field) for aluminum alloys was investigated in the present work. High quality semi-solid slurries of a series of aluminum alloys were manufactured by LSPSF process, such as casting alloy A356, high strength alloy 201, secondary die casting alloy A380 and wrought alloy 2024, 6082 and 7075, in which the primary α-Al presented spherical, small and homogeneous distribution, especially with zero-entrapped liquid. Applications of LSPSF in high pressure die casting process and squeeze casting process were presented. Results showed that LSPSF rheoforming could improve microstructures and increase mechanical properties.

Mechanical Properties Improvement of Semi-Solid State Joining of Aluminum Alloys SSM A356

2015 ◽  
Vol 658 ◽  
pp. 146-150 ◽  
Author(s):  
Atsadawoot Geaowdee ◽  
Prapas Muangjunburee
Keyword(s):  
Mechanical Properties ◽  
Solid State ◽  
Aluminum Alloys ◽  
Welding Speed ◽  
Rotation Speed ◽  
Shielding Gas ◽  
Globular Structure ◽  
A356 Aluminum ◽  
Semi Solid ◽  
Solid State Joining

The aim of this research was to study semi-solid state joining of SSM A356 aluminum alloys which welded at its semi-solid state temperature by using oxygen – acetylene heat source. Then a stirrer was used to stir the weld seam. The joining parameters were rotation speed 1,110 with welding speed 120 mm/min and rotation speed 1,320 rpm with welding speed 160 mm/min. The joining temperatures were 575-590 and 590-610 oC. Joining was performed under nitrogen shielding gas and under argon shielding gas. Physical appearance, macrostructure, microstructure and mechanical properties were analyzed. The results indicated that the weld’s microstructure consisted of globular structure. In addition, porosities were found at the top of weld. However, minimum porosities were obtained from joints under argon shielding gas. The highest tensile strength was achieved from rotation speed at 1,110 rpm with welding speed at 120 mm/min under argon shielding gas with the value of 173 MPa. The joint efficiency was 86 % compared to the base metal.

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