scholarly journals Improvement in Thixoforging of 7075 Aluminium Alloys at High Solid Fraction

2008 ◽  
Vol 141-143 ◽  
pp. 707-712 ◽  
Author(s):  
G. Vaneetveld ◽  
Ahmed Rassili ◽  
Jean Christophe Pierret ◽  
Jacqueline Lecomte-Beckers
Keyword(s):  
Mechanical Properties ◽  
Solid Fraction ◽  
Aluminium Alloys ◽  
High Speed ◽  
High Performance ◽  
Solidification Rate ◽  
High Solid ◽  
High Solid Fraction ◽  
Semi Solid ◽  
7075 Alloy

Thixoforging is a type of semi-solid metal processing at high solid fraction (0.5<fs<1). 7075 aluminium alloys have been used as a feedstock for thixoforging in order to investigate thixoformability of a high performance aluminium alloy at high solid fraction. Higher solid fraction of 7075 alloy is less sensitive to temperature, avoids metal splash at high speed and allows laminar flow at high speed. Hot tool combined with lubricant tool coating are used to slow down the solidification rate of the high solid fraction metal by decreasing thermal exchanges with the tool. Improved thermal and forming parameters [1-2] will be applied to produce an automotive component by thixoforging and mechanical properties have been measured from tensile samples. High mechanical properties are obtained after T6 thermal treatment.

Thixoforging of 7075 Aluminium Alloys at High Solid Fraction

2006 ◽  
Vol 116-117 ◽  
pp. 762-765 ◽  
Author(s):  
G. Vaneetveld ◽  
Ahmed Rassili ◽  
Jacqueline Lecomte-Beckers ◽  
H.V. Atkinson
Keyword(s):  
Solid State ◽  
Laminar Flow ◽  
Solid Fraction ◽  
High Speed ◽  
High Performance ◽  
Stick Slip ◽  
High Solid ◽  
High Solid Fraction ◽  
Semi Solid ◽  
7075 Alloy

Thixoforging is a type of semi-solid metal processing at high solid fraction (0.5<fs<1), which involves the processing of alloys in the semi-solid state. 7075 alloy has been used as a feedstock for thixoforming in order to investigate thixoformability of a high performance aluminium alloy at high solid fraction. The microstructure in semi-solid state consists of fine spheroidal solid grains surrounded by liquid. Thixo behaviour allows laminar flow that avoids macro-porosity and other casting defects and gives better mechanical properties; so we can reduce the weight of functional parts. Higher solid fraction of 7075 alloy is less sensitive to temperature, avoids metal splash at high speed, allows laminar flow at high speed and gives a good smooth surface without stick-slip phenomenon. The process is quicker with less energy and so the production rate increases and the tool has longer life. However, high solid fraction promotes freezing flow because of faster solidification and the lack of liquid phase. This freezing flow creates solid/liquid segregation and increases the forming force.

K-0738 Dynamic Compressive Mechanical Properties of High Solid Fraction Aluminum Alloy in the Semi-solid State

2001 ◽  
Vol I.01.1 (0) ◽  
pp. 365-366
Author(s):  
Shusuke NAKANO ◽  
Toshiji MUKAI ◽  
Masahide KOHZU ◽  
Shigenori TANABE ◽  
Kenji HIGASHI
Keyword(s):  
Mechanical Properties ◽  
Aluminum Alloy ◽  
Solid State ◽  
Solid Fraction ◽  
High Solid ◽  
High Solid Fraction ◽  
Semi Solid

Dilatancy in semi-solid steels at high solid fraction

2017 ◽  
Vol 125 ◽  
pp. 187-195 ◽  
Author(s):  
K.M. Kareh ◽  
C. O'Sullivan ◽  
T. Nagira ◽  
H. Yasuda ◽  
C.M. Gourlay
Keyword(s):  
Solid Fraction ◽  
High Solid ◽  
High Solid Fraction ◽  
Semi Solid

Addition of Swarf to Produce a Semi-Solid Slurry during High Pressure Die-Casting of AS9U3 Aluminum Alloy

2019 ◽  
Vol 285 ◽  
pp. 271-276
Author(s):  
Hooman Hadian ◽  
M. Haddad-Sabzevar ◽  
Mohammad Mazinani
Keyword(s):  
High Pressure ◽  
Aluminum Alloy ◽  
Solid Fraction ◽  
Die Casting ◽  
Internal Cooling ◽  
High Solid ◽  
Cooling Agent ◽  
High Solid Fraction ◽  
Semi Solid ◽  
Pressure Die Casting

An internal cooling agent is used in rapid slurry forming (RSF) process to produce a high solid fraction slurry for a short period of time. In the process used in this research, the swarf which is known to be a low enthalpy material was added to the melt as the internal cooling agent. During the process, the swarf started to melt and a semi-solid slurry with a relatively high solid fraction was formed. This slurry was formed by exchanging the enthalpies between the low and high enthalpy materials. A commercial Al-Si-Cu alloy, i.e. AS9U3 Aluminum alloy, was used in this investigation. The microscopic examination showed that the Al-Si eutectic colonies start to melt during the melting process of swarf material resulting in the formation of globular Alpha-Al grains due to the multiplication of secondary dendrites arms. The fracture of dendrites arms and the subsequent spheroidization were suggested to be the origin of non-dendritic globular grains in the final microstructure. The amount of primary globular Alpha-phase was measured by the image analysis software. The results showed that during high pressure die-casting of AS9U3 Aluminum alloy using 4 mm thick samples, around 35 percent solid has been formed at the temperature of 580 oC.

Shear deformation of high solid fraction (>0.60) semi-solid SnPb under various structures

1995 ◽  
Vol 202 (1-2) ◽  
pp. 112-122 ◽  
Author(s):  
Christophe L. Martin ◽  
Stuart B. Brown ◽  
Denis Favier ◽  
Michel Suéry
Keyword(s):  
Shear Deformation ◽  
Solid Fraction ◽  
High Solid ◽  
High Solid Fraction ◽  
Semi Solid

Benefits of thixoforging hot-crack-sensitive aluminium alloys at high solid fraction

2010 ◽  
Vol 3 (S1) ◽  
pp. 783-786 ◽  
Author(s):  
G. Vaneetveld ◽  
A. Rassili ◽  
J. C. Pierret ◽  
J. Lecomte-Beckers
Keyword(s):  
Solid Fraction ◽  
Aluminium Alloys ◽  
High Solid ◽  
Hot Crack ◽  
High Solid Fraction

Thixoforming of semi-solid AZ91D alloy with high solid fraction prepared by the RUE-based SIMA process

2017 ◽  
Vol 93 (9-12) ◽  
pp. 4317-4328 ◽  
Author(s):  
Yan Xu ◽  
Jianbo Jia ◽  
Chen Chen ◽  
Wenchao Liu ◽  
Shuyi Luo ◽  
...  
Keyword(s):  
Solid Fraction ◽  
Az91d Alloy ◽  
High Solid ◽  
High Solid Fraction ◽  
Sima Process ◽  
Semi Solid

Thixoforging of 7075 Aluminium Alloys at High Solid Fraction

2006 ◽  
pp. 762-765
Author(s):  
G. Vaneetveld ◽  
Ahmed Rassili ◽  
Jacqueline Lecomte-Beckers ◽  
H.V. Atkinson
Keyword(s):  
Solid Fraction ◽  
Aluminium Alloys ◽  
High Solid ◽  
High Solid Fraction

Recent Industrial Application and Perspectives of Rheo-Diecast Process in China

2022 ◽  
Vol 327 ◽  
pp. 238-243
Author(s):  
Da Quan Li ◽  
Xiao Kang Liang ◽  
Fan Zhang ◽  
Song Chen ◽  
Fan Zhang ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Solid Fraction ◽  
Cost Reduction ◽  
Solid Content ◽  
Future Perspectives ◽  
High Solid ◽  
Fraction Solid ◽  
High Solid Fraction ◽  
Heat Treated ◽  
Gas Entrapment

The Rheo-diecast process has been rapidly developed and increasingly used in China in the recent 5 years. The high solid fraction (solid content close to 50%) rheo-diecast components were commercially used in the transportation markets mainly because of lightweight. The mechanical properties of the high solid fraction rheo-diecast components are obviously superior than that of the conventional liquid diecast parts. The defects such as oxide, gas entrapment, shrinkage porosities are well prevented in the high solid fraction rheo-diecast parts. The high solid fraction rheo-diecast parts can be fully T6 heat treated. A comparison between high solid fraction rheo-diecast part and conventional liquid diecast part will be described in detail. The low solid fraction (solid content 5-20%) rheo-diecast components were widely used in the 5G communication markets. The future perspectives of Rheo-diecast process will be described at last. 1. Cost reduction. 2. Production consistency. 3. New Rheo-diecast alloys development. 4. Numerical simulation of Rheological filling.

Sign in / Sign up

Export Citation Format

Share Document