Influence of Ultrasonic Vibration on Preparation for Semi-Solid A356 Alloy

2011 ◽  
Vol 295-297 ◽  
pp. 1465-1469
Author(s):  
Jia Xuan Wang ◽  
Chun Li ◽  
Li Hong Jiang ◽  
Min Fang
Keyword(s):  
Grain Refinement ◽  
A356 Alloy ◽  
Treatment Temperature ◽  
Primary Phase ◽  
Power Ultrasound ◽  
Average Grain Size ◽  
Experimental Parameters ◽  
Size And Morphology ◽  
Semi Solid ◽  
Ultrasonic Influence

In this paper, semi-solid slurry was prepared by power ultrasonic on flowing A356 melts. A simple device of ultrasonic treatment was made and the method of applying power ultrasound from the top of ingot was adopted. we investigated the influence of the experimental parameters impact on the size and morphology of the primary phase α-Al in A356 slurry, which included the power of the power ultrasound, treatment temperature and the distance between ultrasonic source and the melts ( here refer to from vibration head to the bottom of melt channel in this paper). The regularity of ultrasonic influence on grain refinement and morphology spheroidizing of primary phase α-Al in A356 alloy were obtained. The results show that when the loading power range from 800W to 1000W, the grain refinement effect goes more obviously with the increasing power of ultrasonic, howerer, when the power is up to 1500W, the effect goes worse; and the best primary phase is obtained at 615 oC among the four treatment temperature (645 °C, 630 °C, 615 °C, 600 °C); with the increase of the distance, among the four groups data (7mm, 9mm, 12mm, 15mm), the microstructure of A356 alloy goes more coarse and the segregation is more serious, the average grain size and form factor of the best primary phase α-Al was 29.47um and 0.78, respectively in this study.

Microstructure of Semi-Solid Extruded Copper Alloy after Heat Treatment

2019 ◽  
Vol 285 ◽  
pp. 146-152
Author(s):  
Nai Yong Li ◽  
Han Xiao ◽  
Chi Xiong ◽  
De Hong Lu ◽  
Rong Feng Zhou
Keyword(s):  
Heat Treatment ◽  
Heat Treatment Temperature ◽  
Copper Alloy ◽  
Treatment Time ◽  
Solid Phase ◽  
Treatment Temperature ◽  
Primary Phase ◽  
Holding Time ◽  
Average Grain Size ◽  
Semi Solid

The semi-solid extruded ZCuSn10P1 copper alloy were annealed at different temperatures and time. The influences of heat treatment temperature and holding time on the microstructure of semi-solid ZCuSn10P1 copper alloy were investigated. The results show that with the increase of heat treatment temperature, the morphology of the semi-solid microstructure was improved, the sharp angle around the primary phase α-Cu and the liquid droplets were reduced. With the increase of heat treatment time, the solid-liquid segregation of the semi-solid structure was improved. The average grain size of the solid phase increased with the increasing of the holding time. After heat treatment, the solid solubility of the primary phase α-Cu increased, and the Sn and P elements in the liquid phase continued to diffuse to the primary phase α-Cu. The microstructure of semi-solid copper alloy was the most uniform after heat treatment at 350°C for 120 min.

Effect of Eutectic Reaction Induced by La on Microstructure in Semisolid A356 Alloy

2012 ◽  
Vol 424-425 ◽  
pp. 77-80
Author(s):  
Zheng Liu ◽  
Mei Yan Huang ◽  
Kai Cao ◽  
Hong Biao Xu
Keyword(s):  
Eutectic Reaction ◽  
A356 Alloy ◽  
Primary Phase ◽  
La Addition ◽  
Size And Morphology ◽  
Low Superheat

Semisolid A356 alloy was prepared by low superheat pouring. The effects of La as a kind of refinement on the size and morphology of the primary phase in semisolid A356 alloy were researched. The results indicated that semisolid A356 alloy contained certain La addition with particle-like and rosette-like primary phase could be prepared by low superheat pouring. The size and morphology of primary phase in A356 alloy are markedly improved by the suitable addition of La. The refining mechanism of La on the size and morphology of the primary phase in semisolid A356 alloy were concerned with the eutectic reaction induced by La in the alloy.

Research on Effect of La on Microstructure in Semi-Solid A356 Alloy

2010 ◽  
Vol 139-141 ◽  
pp. 693-697 ◽  
Author(s):  
Xiao Mei Liu ◽  
Zheng Liu ◽  
Yong Mei Hu
Keyword(s):  
Binary Alloy ◽  
Master Alloy ◽  
Eutectic Reaction ◽  
A356 Alloy ◽  
Size And Morphology ◽  
Semi Solid ◽  
Low Superheat

Semi-solid A356 alloy slurry grain-refined by Al-La master alloy is prepared by low superheat pouring. The effects of La on the morphology and size of primary grain in semi-solid A356 alloy are researched. The results indicate that the semi-solid A356 alloy slurry with particle-like and rosette-like primary grains can be prepared by low superheat pouring. The size and morphology of the primary grain in semi-solid A356 alloy are markedly improved by La. The refining mechanism of La on the morphology and size of the primary grain in semi-solid A356 alloy is delved. The eutectic reaction of Al-La binary alloy provides the effective nuclei for formation of the primary grains in semi-solid A356 alloy.

Study on Fractal Characteristics of Primary Phase Morphology in Semi-Solid A356 Alloy

2010 ◽  
Vol 139-141 ◽  
pp. 653-656
Author(s):  
Zheng Liu ◽  
Xiao Mei Liu
Keyword(s):  
Fractal Dimension ◽  
A356 Alloy ◽  
Fractal Dimensions ◽  
Primary Phase ◽  
Phase Morphology ◽  
Fractal Characteristic ◽  
Box Counting ◽  
Compound Process ◽  
Fractal Characteristics ◽  
Semi Solid

Semi-solid A356 slurry was prepared by compound process, and the fractal characteristic of primary phase morphology was researched. The fractal dimensions of primary phase morphology in semi-solid A356 alloy were calculated by the calculating program written to calculate the fractal dimensions of box-counting in the imagine of morphology of semi-solid primary phase in A356 alloy. The results indicated that the primary phase morphology in semi-solid A356 prepared by compound process is characterized by fractal dimension, and the primary phase morphology prepared by the different technology parameters had different fractal dimensions. The primary phase morphology at the different position of ingot had the different fractal dimensions, which reflected the effect of solidified conditions at different position in the same ingot on the morphology of semi-solid primary phase

Semi-Solid A356 Alloy Slurry Prepared by Slightly Electromagnetic Stirring with Ti-Based Refiner

2010 ◽  
Vol 152-153 ◽  
pp. 1745-1750
Author(s):  
Zheng Liu ◽  
Xiao Mei Liu ◽  
Wei Min Mao
Keyword(s):  
Grain Size ◽  
A356 Alloy ◽  
Particle Morphology ◽  
Primary Phase ◽  
Electromagnetic Stirring ◽  
Semi Solid

The semi-solid A356 alloy slurry is prepared by slightly electromagnetic stirring with Ti-based refiner. The effects of the refiner on the morphology and the grain size of the primary phase in the slurry are researched. The results indicate that the slurry with particle-like and rosette-like primary phases can be prepared by slightly electromagnetic stirring with the refiner. Compared with the A356 alloys without the refiner, the grain size and particle morphology of primary phase as well as the distribution of the grain with particle-like or rosette-like along radial in the ingot in A356 are markedly improved by the refiner.

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.

Characterization of Globular Microstructure in NMS Processed Aluminum A356 Alloy: The Role of Casting Size

2011 ◽  
Vol 264-265 ◽  
pp. 1868-1877 ◽  
Author(s):  
Farshad Akhlaghi ◽  
Amir H.S. Farhood
Keyword(s):  
A356 Alloy ◽  
Systematic Investigation ◽  
Globular Structure ◽  
Near Net Shape ◽  
Size And Morphology ◽  
Semi Solid ◽  
Aluminum A356 Alloy ◽  
Processing Steps

Semi-solid processing (SSP) technology, due to its ability to provide near-net-shape components with properties far exceeding those of other casting technologies is considered as an alternative for forgings and investment castings. Conventional semi-solid forming, involving the use of heated billets, melt stirring or using cooling slopes require many processing steps and supplementary equipments. This article describes Narrow Melt Stream (NMS), as an alternative process for semi-solid processing of aluminum alloys that eliminates capital cost expenditures, reduces the number of steps required, and hence reduces the costs of making components with a globular structure. However, the applicability of this technique in producing globular structures in the large molds has not been explored. In the present study the results of a systematic investigation on the effects of mold size on the size and morphology of the globular structures formed by NMS processing of Al 356 alloy is reported. For this purpose, five different series of molds were employed. Each series consisted of three molds with identical volumes but different casting moduluses. By using these molds, the effects of casting modulus at constant casting size as well as the effect of casting volume on the size and shape factor of the globular structures in aluminum A356 samples prepared by NMS technique is reported.

Microstructure Evolution of Conventional and Semi-Solid Cast of A356 Aluminium Alloy with Addition of Inoculant

2015 ◽  
Vol 819 ◽  
pp. 25-30 ◽  
Author(s):  
M.N. Laila Masrur ◽  
M. Syukron ◽  
H. Zuhailawati ◽  
A.S. Anasyida
Keyword(s):  
Aluminium Alloy ◽  
Dendritic Structure ◽  
A356 Alloy ◽  
Optical Microscope ◽  
Globular Structure ◽  
Average Grain Size ◽  
Semi Solid ◽  
Vicker’S Microhardness ◽  
Steel Mould ◽  
A356 Aluminium Alloy

This paper investigated the effect of inoculant, Al-5Ti-1B in conventional and semi-solid casting A356 aluminium alloy. A356 aluminium alloy was melted at 850 oC and poured at 680 °C directly into the steel mould and on the inclined slope into steel mould. Inoculant was added in various percentages of 1 wt.%, 2 wt.%, 3 wt.% and 3.5 wt.% in A356 aluminium alloy melt. Microstructure and microhardness were characterized using optical microscope and Vicker’s microhardness tester. The addition of master alloy up 3.5 wt.% Al-5Ti-1B in conventional casting refined dendritic structure with average grain size of 33.41 μm. The microstructures of semi-solid A356 aluminium alloy with addition of Al-5Ti-1B consist of equiaxed structure of α-Al. Further addition of Al-5Ti-1B refined the globular structure of α-Al. The higher hardness was achieved for A356 alloy prepared using semi-solid with addition of 3.5 wt.% of Al-5Ti-1B.

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