scholarly journals A novel Zn-Cu-P master alloy and its modification performance on primary Si of A390 alloy

2019 ◽  
Vol 12 ◽  
pp. 1006-1010 ◽  
Author(s):  
Tong Gao ◽  
Yihan Bian ◽  
Xiangfa Liu
Keyword(s):  
Master Alloy ◽  
Primary Si ◽  
A390 Alloy

Synthesis of a novel Zn–7Fe–3P master alloy and its modifying performance on primary Si in A390 alloy

2021 ◽  
Vol 288 ◽  
pp. 129367
Author(s):  
Lingyu Liu ◽  
Tong Gao ◽  
Kai Zhao ◽  
Xiangfa Liu
Keyword(s):  
Master Alloy ◽  
Primary Si ◽  
A390 Alloy

A High Effective and Low-Cost Modifier for Hypereutectic Al-Si Alloys

2013 ◽  
Vol 721 ◽  
pp. 282-286
Author(s):  
Guang Hui Qi
Keyword(s):  
Grain Size ◽  
Master Alloy ◽  
Low Cost ◽  
Environment Pollution ◽  
Casting Method ◽  
Good Future ◽  
Primary Si ◽  
Average Grain Size ◽  
Master Alloys

In order to settle environment pollution and provide a high effective and low-cost modifier for refining the primary Si in hypereutectic Al-Si alloys, Al-Fe-P master alloys containing 2.0~5.0% phosphorus have been invented by casting method. The Al-Fe-P master alloys can be conveniently produced and an excellent modification can be obtained by adding 0.3~0.8wt% Al-Fe-P master alloy in Al-Si alloys containing 12%-25% Si at a relatively lower modifying temperature. The number of primary Si increases obviously and the average grain size of primary Si decreases largely, less than 50μm. Furthermore Al-Fe-P master alloys have many advantages, such as low cost, convenient operation technology, no pollution, stable and long-term modification effect, easy storage and etc. Al-Fe-P master alloys have overcome the shortages of current modifier and have a good future for hypereutectic Al-Si alloy modification.

Numerical simulation and experiment validation of level-pour direct-chill casting of A390 alloy hollow billets under different feeding schemes

2016 ◽  
Vol 26 (6) ◽  
pp. 1871-1888 ◽  
Author(s):  
Kesheng Zuo ◽  
Haitao Zhang ◽  
Ke Qin ◽  
Jianzhong Cui
Keyword(s):  
Numerical Simulation ◽  
Temperature Field ◽  
Three Dimensional ◽  
Direct Chill ◽  
Melt Flow ◽  
Content Type ◽  
Primary Si ◽  
Hollow Billet ◽  
Dc Casting ◽  
A390 Alloy

Purpose – The purpose of this paper is to study the effect of feeding scheme on melt flow and temperature field during the steady-state of level-pour direct-chill (DC) casting of A390 alloy hollow billet and optimize the design of feeding scheme. Design/methodology/approach – Melt flow and temperature field are investigated by numerical simulation, which is based on a three-dimensional mathematical model and well verified by experiments. Findings – The numerical results reveal that both melt flow and temperature field are obviously affected by the feeding scheme. The homogeneity of melt flow and temperature field in hollow billet with the feeding scheme of modified four inlets are better than the other feeding schemes. Experimental results show that crack can be eliminated by increasing the number of feeding inlets. The primary Si size appears unaffected while the distribution of primary Si particles is highly affected by the change of feeding scheme. Only with the feeding scheme of modified four inlets can fine and uniformly distributed primary Si particles be achieved. Practical implications – The paper includes implications for the design of feeding scheme in level-pour DC casting of hollow billet for practical use. Originality/value – This paper develops different feeding schemes for level-pour DC casting of hollow billet and optimizes the design of feeding scheme.

scholarly journals Simultaneous Refinement of Primary Si and Modification of Eutectic Si in A390 Alloy Assisting by Sr-Modifier and Serpentine Pouring Channel Process

Materials ◽  
2019 ◽  
Vol 12 (19) ◽  
pp. 3109 ◽  
Author(s):  
Pengyu Yan ◽  
Weimin Mao ◽  
Jing Fan ◽  
Bingkun Wang
Keyword(s):  
Eutectic Silicon ◽  
Primary Silicon ◽  
Interface Energy ◽  
Nucleation Site ◽  
Nucleation And Growth ◽  
Dominant Factor ◽  
Channel Process ◽  
Primary Si ◽  
Eutectic Si ◽  
A390 Alloy

In this study, A390 alloy was prepared using the combined process of a water-cooled copper serpentine pouring channel (SPC) and strontium (Sr) modifier, in order to simultaneously refine primary silicon (Si) and modify eutectic silicon (Si). The nucleation and growth mechanisms of the Si phase were discussed by morphology analysis and non-isothermal analytical kinetics. The results indicate that the size of primary Si is refined to 25.2–28.5 µm and the morphology of eutectic Si is modified from acicular into fibrous. The serpentine pouring channel process stimulates primary Si nucleation due to chilling effect and has no influence on eutectic Si nucleation. Impacts of Sr-modifier on primary and eutectic Si are similar, including three aspects: (1) poisoning of the nucleation site; (2) decreasing the interface energy between Si phase and liquid; (3) raising the activation energy for diffusion across solid-liquid interface. The content of Sr determines which one of the three aspects mentioned above is the dominant factor to promote or restrain the nucleation and growth of the primary and eutectic Si in hypereutectic Al-Si alloy.

Preparation of Semi-Solid Slurry of Hypereutectic Al-Si Alloy by Ultrasonic Vibration

2008 ◽  
Vol 141-143 ◽  
pp. 767-771 ◽  
Author(s):  
Jun Wen Zhao ◽  
Shu Sen Wu ◽  
Ping An ◽  
You Wu Mao
Keyword(s):  
Mechanical Properties ◽  
Heat Treatment ◽  
Tensile Strength ◽  
Ultimate Tensile Strength ◽  
Ultrasonic Vibration ◽  
Average Diameter ◽  
Primary Si ◽  
Semi Solid ◽  
A390 Alloy

The preparation of semi-solid slurry of hypereutectic Al-Si alloy by Ultrasonic Vibration (USV) has been studied. The A390 alloy melt was poured into a preheated metal cup, and subsequently the ultrasonic vibrator was dipped into the melt and USV was imposed. The solidified microstructure of the slurry has been analyzed, and the mechanical properties of the alloy have been tested by making samples through diecasting of the slurry. The results show that the primary Si particles of A390 alloy became finer, rounder and uniformly distributed in microstructure of A390 alloy slurry if imposed with USV, and average diameter of primary Si particles was about 20μm. With USV, the ultimate tensile strength and the hardness of rheo-casted samples increased by over 25% and near 50% respectively besides the elongation rose by above 100%. After heat treatment, the mechanical properties were further improved. In addition, the mechanism of preparation of semi-solid slurry of hypereutectic Al-Si alloy by USV is discussed.

A New Al-ZnS Master Alloy Designed for Modifying Hypereutectic Al-Si Alloy and its Refinement Performance on Primary Si

2015 ◽  
Vol 1088 ◽  
pp. 242-244 ◽  
Author(s):  
Cheng Dong Li ◽  
Wen Qiang Si ◽  
Mei Zhao ◽  
Chuan Hao Sun ◽  
Xiao Song Guo
Keyword(s):  
Rare Earth ◽  
Master Alloy ◽  
Rare Earth Metals ◽  
Primary Silicon ◽  
Processing Technology ◽  
Primary Si

To increase the industrial applicability of hypereutectic Al-Si alloys, various methods have been used to refine primary silicon. The addition and refinement effects of phosphorus (P), rare earth metals (RE) on primary Si have been studied widely, But they have been testified be with some disadvantages, that is, the pollution to the environment of P and the high cost of RE, etc. Now, a new refiner - ZnS and the corresponding processing technology were researched. Microstructures of hypereutectic Al-Si alloy (Si wt. 24%) with fine primary Si were successfully obtained. And the primary Si can be refined from more than 80μm to 20μm. And the distribution of primary silicon is getting more uniform.

Series of Al–P Master Alloy and Excellent Refining Performance on Hypereutectic A390 Alloys

2011 ◽  
Vol 306-307 ◽  
pp. 613-616 ◽  
Author(s):  
Min Zuo ◽  
Xiang Fa Liu
Keyword(s):  
Master Alloy ◽  
Primary Si ◽  
Master Alloys ◽  
Refining Performance

Series of Al–P master alloys including binary Al–P and Al–Si/Zr–P master alloys containing pre-formed phosphides have been developed. Hypereutectic A390 alloys have shown fast refinement response to the addition of series of Al–P master alloys. After refined at 780°C for 30 min, the coarse primary Si can be refined obviously from 90 μm to less than 20 μm. In addition, the morphologies of primary Si are changed from coarse polygon to near-sphere shape, and the distribution is improved simultaneously.

Refinement of primary Si in Cu–50Si alloys with novel Al–Zr–P master alloy

Rare Metals ◽  
2013 ◽  
Vol 32 (3) ◽  
pp. 252-257 ◽  
Author(s):  
Min Zuo ◽  
Zhong-Shi Zhang ◽  
Xin-Ying Teng ◽  
Hao-Ran Geng
Keyword(s):  
Master Alloy ◽  
Primary Si
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