Hot deformation behavior of a Sr-modified Al-Si-Mg alloy: Constitutive model and processing maps

被引：48
作者：
Lin, Y. C. [1 ,2 ,3 ]
Luo, Shun-cun [1 ,2 ]
Jiang, Xing-you [1 ,2 ]
Tang, Yi [1 ,2 ]
Chen, Ming-song [1 ,2 ,3 ]
机构：
[1] Cent S Univ, Sch Mech & Elect Engn, Changsha 410083, Hunan, Peoples R China
[2] Cent S Univ, Light Alloy Res Inst, Changsha 410083, Hunan, Peoples R China
[3] Cent S Univ, State Key Lab High Performance Complex Mfg, Changsha 410083, Hunan, Peoples R China
来源：
TRANSACTIONS OF NONFERROUS METALS SOCIETY OF CHINA | 2018年 / 28卷 / 04期
基金：
中国国家自然科学基金;
关键词：
Al-Si-Mg alloy; constitutive model; processing map; microstructure; NI-BASED SUPERALLOY; TEMPERATURE FLOW BEHAVIOR; STRENGTH ARMOR STEEL; A356; ALUMINUM-ALLOY; STRAIN-RATE; MICROSTRUCTURAL EVOLUTION; BASE SUPERALLOY; COMPRESSION; PREDICTION; STRESS;
D O I：
10.1016/S1003-6326(18)64692-8
中图分类号：
TF [冶金工业];
学科分类号：
0806 ;
摘要：
Isothermal compression experiments were conducted to study the hot deformation behaviors of a Sr-modified Al-Si-Mg alloy in the temperature range of 300-420 degrees C and strain rate range of 0.01-10 s(-1). A physically-based model was developed to accurately predict the flow stress. Meanwhile, processing maps were established to optimize hot working parameters. It is found that decreasing the strain rate or increasing the deformation temperature reduces the flow stress. The high activation energy is closely related to the pinning of dislocations from Si-containing dispersoids. Moreover, the deformed grains and the Si-containing dispersoids in the matrix are elongated perpendicular to the compression direction, and incomplete dynamic recrystallization (DRX) is discovered on the elongated boundaries in domain with peak efficiency. The flow instability is mainly attributed to the flow localization, brittle fracture of eutectic Si phase, and formation of adiabatic shear band. The optimum hot working window is 380-420 degrees C and 0.03-0.28 s(-1).
引用
收藏
页码：592 / 603
页数：12
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