Microstructure evolution of Al-Si semi-solid slurry by gas bubble stirring method

2011 ◽  
Vol 18 (6) ◽  
pp. 1789-1794 ◽  
Author(s):  
Lei Zhang ◽  
Xuan-pu Dong ◽  
Ji-qiang Li ◽  
Kan Li ◽  
Zong-kui Zhang ◽  
...  
Keyword(s):  
Microstructure Evolution ◽  
Gas Bubble ◽  
Semi Solid

Fabrication of Rheological Material by Rotating Gas Bubble Stirring

2011 ◽  
Vol 239-242 ◽  
pp. 1573-1576 ◽  
Author(s):  
Lei Zhang ◽  
Xuan Pu Dong ◽  
Wen Jun Wang ◽  
Rong Ma ◽  
Ke Li ◽  
...  
Keyword(s):  
Flow Rate ◽  
Gas Flow ◽  
Rotation Speed ◽  
Gas Bubble ◽  
Gas Flow Rate ◽  
Control Functions ◽  
Stirring Effect ◽  
Strong Convection ◽  
Semi Solid ◽  
Flow Rate Control

A rotating gas bubble stirring technique with specially designed equipment has been developed for the production of light alloy semi-solid slurry. The equipment was specially designed to have temperature, rotation speed and gas flow rate control functions. An Al-Si aluminum alloy was applied as the experimental material. The results showed that large volume of semi-solid slurry could be achieved with the actual stirring temperature of 4 °C to 20 °C below the liquidus temperature of the alloy, and the rotation speed of 195 r/min, and the gas flow rate of 2 L/min. A strong convection and weak stirring effect which was induced by the rotating gas bubbles in the melt was founded responsible for the formation of the semi-solid slurry.

Study of Microstructure Evolution during Semi-Solid Processing of an In-Situ Al Alloy Composite

2015 ◽  
Vol 30 (3) ◽  
pp. 356-366 ◽  
Author(s):  
Santosh Kumar ◽  
Prosenjit Das ◽  
Sandeep K. Tiwari ◽  
Manas K. Mondal ◽  
Supriya Bera ◽  
...  
Keyword(s):  
Microstructure Evolution ◽  
Al Alloy ◽  
Alloy Composite ◽  
Semi Solid

Mechanical Response and Microstructure Evolution of a Repetitive Upsetting Extrusion Processed AZ61 Magnesium Alloy in Semi‐Solid Compression

2019 ◽  
Vol 21 (9) ◽  
pp. 1900362
Author(s):  
Yan Xu ◽  
Xuxing Zhang ◽  
Wei Li ◽  
Penghong Hu ◽  
Haohao Dai ◽  
...  
Keyword(s):  
Magnesium Alloy ◽  
Microstructure Evolution ◽  
Mechanical Response ◽  
Az61 Magnesium Alloy ◽  
Semi Solid

Study of ECAP Processing Routes on Semi-Solid Microstructure Evolution of A356 Alloy

2008 ◽  
Vol 141-143 ◽  
pp. 397-402 ◽  
Author(s):  
M. Moradi ◽  
Mahmoud Nili-Ahmadabadi ◽  
B. Heidarian ◽  
Mohammad Habibi-Parsa
Keyword(s):  
Microstructure Evolution ◽  
A356 Alloy ◽  
Pressing Method ◽  
Processing Technologies ◽  
Angular Pressing ◽  
Cross Section Area ◽  
Section Area ◽  
Semisolid Forming ◽  
Semi Solid ◽  
Number Of Passes

Semi- solid (SS) processing technologies provide the production of metal parts with homogeneous, fine and globular – grained microstructure. This is one of the most successful and reliable methods to produce near net shape products exhibiting good mechanical properties. Production of feed stock with non-dendritic and spherical structure is the critical factors in semisolid forming. Among several processes to obtain a globular microstructure, the SIMA (strain induced melt activated) process is simple and advantageous with respect to equipment and eliminating the melting stage before reheating. In this research, Al (A356) has been used and in order to induce strain, ECAP (equal channel angular pressing) method has been applied. ECAP is a method in which a great strain is induced and severe plastic deformation without any changes in cross section area occurs. To induce larger strain, ECAP process was carried out on annealed specimens up to several passes in route A (no rotation of samples around linear axis between each pass) and Bc (90◦ rotation of samples around linear axis between each pass), in ambient temperature. The reheating condition was optimized and the comparison between different routes and number of passes was investigated. The microstructure evolution of deformed and reheated Al (A356) was characterized by SEM (Scanning electron microscopy) and optical microscopy. In addition, the relation between the induced strain with size and shape of particles has been studied.

scholarly journals Effect of Experimental Conditions on 7075 Aluminium Response during Thixoextrusion

2012 ◽  
Vol 504-506 ◽  
pp. 345-350 ◽  
Author(s):  
Adriana Neag ◽  
Véronique Favier ◽  
Mariana Pop ◽  
Eric Becker ◽  
Régis Bigot
Keyword(s):  
Aluminum Alloy ◽  
Microstructure Evolution ◽  
Deformation Behavior ◽  
Liquid Fraction ◽  
Heat Losses ◽  
Heating Process ◽  
Semisolid State ◽  
Experimental Conditions ◽  
Solid Aluminum ◽  
Semi Solid

The deformation behavior of semi-solid aluminum alloy is strongly dependent on the microstructure. This paper illustrates several experimental research works concerning thixoextrusion of 7075 aluminum alloy which was carried out at “Arts et Métiers ParisTech” of Metz. Inductive re-heating of the aluminum billet is the method used in order to obtain the target liquid fraction for thixoextrusion. To minimize the heat losses, a sample obtained from a direct extruded bar is inserted in a die for reheating in semisolid state and thixoextrusion. During the experimental re-heating process, the temperature was directly controlled by using thermocouples for temperature measurements in the sample and also in the die. The influence of different working ram speeds and reheating temperature on the microstructure evolution was studied by optical microscopy. The experimental results on extrusion load and microstructure evolution of the component are reported.

Effects of SiC Particle and Holding Time on Semi-Solid Microstructure of SiCP/AZ61 Composites

2010 ◽  
Vol 152-153 ◽  
pp. 628-633
Author(s):  
Fa Yun Zhang ◽  
Jian Xiong Ye ◽  
Hong Yan
Keyword(s):  
Heat Treatment ◽  
Microstructure Evolution ◽  
Volume Fraction ◽  
Particle Volume Fraction ◽  
Isothermal Holding ◽  
Holding Time ◽  
Isothermal Heat Treatment ◽  
Particle Volume ◽  
Semi Solid ◽  
Sic Particle

Effects of SiC particle and holding time on microstructure evolution of SiCP/AZ61 composites during semi-solid isothermal heat treatment method were studied, and evolution mechanism of semi-solid microstructure of composites was discussed. The results indicated that the process of microstructure evolution of SiCP/AZ61 composites by the isothermal holding at the temperatures of 595°C for different times (0min~90min) experienced in succession the rapid merging of the secondary dendritic arms →large massive structure→melting and separating of the local grain boundary →spheroidization of the gains →slowing growth of globular microstructure. Synthetically, after isothermal holding at 595°C for 30min to 60min the favorable semi-solid microstructure can be obtained; Compared with the monolithic AZ61alloy, microstructure of SiCP/AZ61 composites during semi-solid isothermal heat-treatment was finer as a result of entering of Sic particle, and with the increasing of SiC particle volume fraction, globular gain size was smaller.

Microstructure evolution of Al-4Cu-Mg alloy during semi-solid treatment

2007 ◽  
Vol 14 (2) ◽  
pp. 151-156
Author(s):  
Haitao Jiang ◽  
Zhenli Mi ◽  
Di Tang ◽  
Miaoquan Li
Keyword(s):  
Microstructure Evolution ◽  
Mg Alloy ◽  
Semi Solid

Microstructure evolution and mechanical properties of ZK60 magnesium alloy produced by SSTT and RAP route in semi-solid state

2013 ◽  
Vol 23 (12) ◽  
pp. 3621-3628 ◽  
Author(s):  
Chang-peng WANG ◽  
Ying-ying ZHANG ◽  
Di-fan LI ◽  
Hua-sheng MEI ◽  
Wei ZHANG ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Solid State ◽  
Magnesium Alloy ◽  
Microstructure Evolution ◽  
Semi Solid ◽  
Zk60 Magnesium Alloy
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