Simulation optimization of die-casting process, microstructure and mechanical properties of Al-7Si-0.35Mg-0.1Ti alloys

被引：0
|
作者：
Liu W.-C. [1 ]
Ding D.-H. [1 ]
Wang Y.-B. [2 ]
Lu Y.-J. [2 ]
机构：
[1] National Engineering Research Center of Light Alloy Net Forming, School of Materials Science and Engineering, Shanghai Jiao Tong University, Shanghai
[2] Shanghai NATE Automobile Fastener Co., Ltd., Shanghai
来源：
Zhongguo Youse Jinshu Xuebao/Chinese Journal of Nonferrous Metals | 2021年 / 31卷 / 09期
关键词：
Al-7Si-0.35Mg-0.1Ti alloy; Die casting; Injection speed; Numerical simulation; Pouring temperature;
D O I：
10.11817/j.ysxb.1004.0609.2021-39675
中图分类号：
学科分类号：
摘要：
The effects of micro Sr modification on the microstructure and mechanical properties of Al-7Si-0.35Mg-0.1Ti alloy were firstly studied. Then, the pouring temperature and injection speed of 0.06% Sr modified Al-7Si-0.35Mg-0.1Ti alloy in the die casting process were calculated by numerical simulation technology, and the experimental verification was carried out. The simulation results show that when the pouring temperature is 680 ℃, the secondary dendrite arm spacing is smaller; with the increase of injection speed (1 m/s, 2 m/s, 4 m/s), although the air entrainment is more obvious, the position and quantity of air entrainment are more, but the pore size is relatively small. The results of die casting verification experiment show that, with the increase of injection speed from 1 m/s to 4 m/s, the primary α(Al) phase changes from cellular dendrite to globular or near globular, and the average grain size decreases gradually; the volume gas in the casting changes from large-size pores to small-size shrinkage porosity, which is basically consistent with the numerical simulation results. At the same time, the ultimate tensile strength and elongation of the die casting alloys increase by 23.7% and 188.5%, respectively. And the fracture mechanism of the tested alloys changes from the brittle fracture determined by large pores at 1 m/s to mixed fracture mode of brittle fracture and ductile fracture determined by eutectic Si phase at 4 m/s. © 2021, China Science Publishing & Media Ltd. All right reserved.
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页码：2357 / 2370
页数：13
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