Effect of Intergranular Liquid Film Characteristics on Hot Tearing Formation of Hypereutectic Al-Si Alloy

被引：0
作者：
Zhou, Rui [1 ,2 ]
Fang, Xiaogang [1 ,2 ]
Yu, Junchao [1 ,2 ]
Zhang, Kaixuan [1 ,2 ]
Chen, Yiqing [1 ]
机构：
[1] Hefei Univ Technol, Sch Mat Sci & Engn, Hefei 230009, Anhui, Peoples R China
[2] Engn Res Ctr, Minist Educ High Performance Copper Alloy Mat & Fo, Hefei 230009, Anhui, Peoples R China
来源：
INTERNATIONAL JOURNAL OF METALCASTING | 2024年
基金：
中国国家自然科学基金;
关键词：
hypereutectic Al-Si alloy; viscoelasticity; stress-strain testing; intergranular liquid film; hot tearing; TEMPERATURE MECHANICAL-PROPERTIES; RHEOLOGICAL BEHAVIOR; ALUMINUM-ALLOYS; SEMISOLID STATE; MUSHY ZONE; TENSILE;
D O I：
10.1007/s40962-024-01475-6
中图分类号：
TF [冶金工业];
学科分类号：
0806 ;
摘要：
Hot tearing is a common issue that occurs during the solidification process of various aluminum alloys. To comprehend the mechanism behind hot tearing, a study was conducted using the principle of tensile shear rheology. The study involved testing the rheological properties of the hypereutectic Al-Si alloy in a semi-solid state using a self-developed device. The study revealed that hypereutectic Al-Si alloy displayed viscoelasticity near the solidus temperature, which directly affected the fluidity of the intergranular liquid film. Additionally, the stress-strain characteristics of hypereutectic Al-Si alloy in a semi-solid state were examined through high-temperature tensile testing. The results showed that the alloy exhibited varying mechanical behaviors at different solid fractions. After performing a detailed examination of the fracture surface morphology of the sample acquired from the tensile test, we arrived at the conclusion that the thickness of the intergranular liquid film plays a crucial role in the creation and progression of hot tearing. An increased thickness of liquid film can facilitate the feeding mechanism, thereby mitigating the propensity for the formation of hot tearing.
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页数：9
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