Globularization of Primary Phase of Al–7Si–0.3Mg Alloy During Cooling Slope Processing and Isothermal Holding

2021 ◽  
Author(s):  
Prosenjit Das ◽  
Pradip Dutta
Keyword(s):  
Isothermal Holding ◽  
Primary Phase ◽  
Cooling Slope

Characterization on Primary Phase Morphology of Semisolid A356 Alloy during Isothermal Holding with Fractal

2012 ◽  
Vol 531-532 ◽  
pp. 67-72 ◽  
Author(s):  
Zheng Liu ◽  
Xiao Mei Liu
Keyword(s):  
Fractal Dimension ◽  
Fractal Theory ◽  
Isothermal Holding ◽  
A356 Alloy ◽  
Primary Phase ◽  
Phase Morphology ◽  
Processing Conditions ◽  
Alloy Solidification ◽  
Fractal Character ◽  
Holding Temperature

Semisolid A356 alloy was prepared by low superheat pouring, and evolution of primary phase morphology in semisolid A356 alloy during isothermal holding was characterized by fractal theory. The results indicated that the primary phase morphology in the alloy had fractal character, and the evolution of the primary phase morphology in the alloy could be characterized by fractal dimension. The primary phase morphology at the different isothermal holding temperature and holding time had the different fractal dimension, which meant the effect of processing conditions on the morphology in the alloy. Solidification of the alloy was a course of change in fractal dimension.

Evolution Characteristics of Primary Phase in A356 Al Alloy during Isothermal Holding in Solid-Liquid Phase Region

2011 ◽  
Vol 421 ◽  
pp. 39-42
Author(s):  
Zheng Liu ◽  
Kai Cao ◽  
Hong Biao Xu ◽  
Mei Yan Huang
Keyword(s):  
Liquid Phase ◽  
Isothermal Holding ◽  
A356 Alloy ◽  
Phase Region ◽  
Primary Phase ◽  
Al Alloy ◽  
Evolution Characteristics ◽  
Solid Liquid ◽  
Holding Temperature

Evolution characteristics of primary phase in A356 alloy at the different isothermal holding temperatures and time were investigated. The results showed that there were the effects of the isothermal holding temperature and time on the evolution of primary phase, and microstructure changed from dendritic-like to rosette-like, and then to particle- or globular-like with the decrease of holding temperature. The suitable technology in the test was obtained, in which when being held at 600°C for 5min, the roundness and size of primary became better.

Effect of Mechanical Vibration during the Solidification Process of an Aluminium Alloy A356

2014 ◽  
Vol 976 ◽  
pp. 14-18
Author(s):  
Edgar Cardoso-Legorreta ◽  
Alberto Arenas Flores ◽  
Felipe Legorreta García
Keyword(s):  
Aluminum Alloy ◽  
Aluminium Alloy ◽  
Morphological Changes ◽  
Mechanical Vibration ◽  
Solidification Process ◽  
Primary Phase ◽  
Metallic Alloys ◽  
Raw Material ◽  
Mechanical Vibrations ◽  
Cooling Slope

The treatment with mechanical vibrations during the solidification process promote microstructural changes in metallic alloys, in order to have a better understanding on this matter mechanical vibration were applied to an aluminum alloy A356, while teeming in order to evaluate the morphological changes on αAl primary phase in the solidification process. Two routes were analyzed, a cooling slope and a rotational mold. This paper shows the results of quantify the effect of mechanical vibration and the specific characteristic of casting to obtain a spherical morphology on the αAl primary, that allow to obtain thixoformable raw material.

Microstructure Evolution and Mechanical Properties of Rheocast A319 Aluminum Alloy Using Cooling Slope

2014 ◽  
Vol 663 ◽  
pp. 261-265
Author(s):  
M.S. Salleh ◽  
M.Z. Omar ◽  
Junaidi Syarif ◽  
M.N. Mohammed ◽  
K.S. Alhawari
Keyword(s):  
Mechanical Properties ◽  
Aluminum Alloy ◽  
Automotive Industry ◽  
Primary Phase ◽  
Pouring Temperature ◽  
Cooling Slope ◽  
Subsequent Separation ◽  
A319 Alloy ◽  
Slope Wall ◽  
Cast Condition

A319 aluminum alloys are commonly used in automotive industry due to a combination of good fluidity and mechanical strength. In this present work, cooling slope (CS) rheocasting process was employed to produce A319 billets with near spherical morphology of primary Al phase. The dendritic primary phase in the cast A319 alloy had readily transformed into non-dendritic when the ingots were cast over a cooling plate from pouring temperatures between 620°C and 640°C and with cooling lengths of between 300 mm and 400 mm. The shear driven flow of the solidifying melt on the cooling slope wall promotes heterogeneous nucleation of α-Al phase and subsequent separation from there due to shear driven flow of the solidifying melt produced nearly spheroidal morphology of the primary phase in the microstructure. The results show that the best combination of pouring temperature and cooling length was found to be 630°C and 400 mm respectively. The hardness of the rheocast ingots improved to 85.3 HV from 81.8 HV in as-cast condition.

The Effects of Cooling Slope Casting and Isothermal Treatment on Wear Behavior of A380 Alloy

2011 ◽  
Vol 264-265 ◽  
pp. 42-47 ◽  
Author(s):  
Nurşen Saklakoğlu ◽  
S. Gencalp ◽  
Şefika Kasman
Keyword(s):  
Tribological Properties ◽  
Wear Behavior ◽  
Casting Process ◽  
Primary Phase ◽  
Isothermal Treatment ◽  
Globular Microstructure ◽  
Cooling Slope ◽  
A380 Alloy ◽  
Pin On Disc ◽  
Cooling Slope Casting

In this study, A380 aluminum alloy feedstock produced with cooling slope casting was exposed to isothermal treatment to obtain a globular microstructure which is a key feature for semisolid forming. The dendritic primary phase in the conventionally cast A380 alloy has readily transformed into a non-dendritic one in ingots cast over a cooling plate from pouring temperatures between 615, 630 and 650 °C. After the casting process, isothermal treatment was carried out at 565 °C in induction unit. Isothermal treatment yields a globular microstructure. To determine the tribological properties of this alloy, a pin-on-disc tribometer was used to carry out tribological tests under dry sliding conditions. The results showed that both cooling slope casting and isothermal treatment has an effect on tribological properties.

Microstructure Evolution of A356 Aluminum Alloy Produced by Cooling Slope Method

2011 ◽  
Vol 402 ◽  
pp. 272-276 ◽  
Author(s):  
Salman Nourouzi ◽  
Sayed Mahdi Ghavamodini ◽  
Hamid Baseri ◽  
Amin Kolahdooz ◽  
Mohammad Botkan
Keyword(s):  
A356 Alloy ◽  
Mold Temperature ◽  
Primary Phase ◽  
Semisolid Processing ◽  
Steel Mold ◽  
Cooling Slope ◽  
Cylindrical Steel ◽  
Size And Morphology ◽  
A356 Aluminum ◽  
Conventionally Cast

In this work the cooling slope (CS) method was employed to produce the A356 feedstock in semisolid processing. The dendritic primary phase in the conventionally cast A356 alloy has transformed into a non-dendritic one in ingots cast over a cooling plate with (625°C, 650°C and 680°C) superheat. After pouring, the melt which became semisolid at the end of the plate was consequently poured into cylindrical steel mold with the various mold temperatures of (25°C, 200°C, 400°C). In this study, the cooling slope was adjusted at 50o with respect to the horizontal plane and 500mm length. It was found that the pouring and mold temperature affect the size and morphology of α-Al phase.

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