Comparison study of hot deformation behavior and processing map of AZ80 magnesium alloy casted with and without ultrasonic vibration

Chen, Xingrui; Liao, Qiyu; Niu, Yanxia; Jia, Yonghui; Le, Qichi; Ning, Shaocheng; Hu, Chenglu; Hu, Ke; Yu, Faquan

doi:10.1016/j.jallcom.2019.06.242

Cited by 75 publications

(12 citation statements)

References 28 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The higher the hot deformation activation energy is, the greater the obstruction forces to the dislocation movement during hot deformation [9]. Many studies on the hot working behavior of AZ80 alloys without reinforcement were done [23][24][25]. Chen et al [23] compared the workability of an AZ80 alloy casted with and without a variable-frequency ultrasonic field (VUF) by uniaxial hot compression tests at a temperature range of 250-400 • C and strain-rate range of 0.001-1 s −1 .…”

Section: Constitutive Modelingmentioning

confidence: 99%

“…Many studies on the hot working behavior of AZ80 alloys without reinforcement were done [23][24][25]. Chen et al [23] compared the workability of an AZ80 alloy casted with and without a variable-frequency ultrasonic field (VUF) by uniaxial hot compression tests at a temperature range of 250-400 • C and strain-rate range of 0.001-1 s −1 . They found that the Q of casting AZ80 without VUF (192.38 kJ/mol) was fairly higher than that of casting AZ80 with VUF (165.30 kJ/mol).…”

Section: Constitutive Modelingmentioning

confidence: 99%

See 1 more Smart Citation

Hot Compression Deformation and Activation Energy of Nanohybrid-Reinforced AZ80 Magnesium Matrix Composite

Fan

Zhou

et al. 2020

Metals

View full text Add to dashboard Cite

The hot deformation test of the nano silicon carbide (nano-SiC) and carbon nano tubes (CNT) hybrid-reinforced AZ80 matrix composite was performed at compression temperatures of 300–450 °C and strain rates of 0.0001–1 s−1. It could be observed that the flow stress of the nanocomposite rose with the reduction of deformation temperature and the increase of strain rate. The hot deformation behaviors of the composite could be described by the sine-hyperbolic Arrhenius equation, and deformation activation energy (Q) was calculated to be 157.8 kJ/mol. The Q values of the extruded nanohybrid/AZ80 composite in this study and other similar studies on extruded AZ80 alloys were compared in order to analyze the effect of the addition of reinforcement, and the effects of deformation conditions on activation energy were analyzed. Finally, the compression microstructure in an unstable condition was carefully analyzed, and results indicated that the phenomenon of local instability was easy to occur at the compression specimen of the nanohybrid/AZ80 composite under deformation conditions of low temperature with high strain rate (300 °C, 0.1–0.01 s−1), and high temperature with low strain rate (450 °C, 0.0001 s−1).

show abstract

Section: Constitutive Modelingmentioning

confidence: 99%

Section: Constitutive Modelingmentioning

confidence: 99%

Hot Compression Deformation and Activation Energy of Nanohybrid-Reinforced AZ80 Magnesium Matrix Composite

Fan

Zhou

et al. 2020

Metals

View full text Add to dashboard Cite

show abstract

“…ε − lnsinh(ασ) (Figure 4a). By substituting the α, peak stress σp under different deformation conditions, and ε into Equation (9), and using the least-square to perform the linear regression, the stress exponent n is determined as 6.24648 from the slopes of ln ε -ln sin h ασ (Figure 4a).…”

Section: Constitutive Equationmentioning

confidence: 99%

“…Because of the limited capability of plastic deformation due to its hexagonal-close-packed crystal structure, Mg alloy products are mainly made through die casting. However, the defects of casting products, such as porosity and shrinkage, mean that they cannot meet the requirements of high-performance structural materials, greatly limiting their application [8][9][10]. Thus, Mg alloy products are increasingly being made using various plastic deformation methods to lessen these limitations [11], contributing to their having better mechanical properties than casting products.…”

Section: Introductionmentioning

confidence: 99%

Characterization of Hot Deformation Behavior and Processing Maps of Mg-3Sn-2Al-1Zn-5Li Magnesium Alloy

Guo

Xuanyuan

Lia

et al. 2019

Metals

View full text Add to dashboard Cite

The dynamic microstructure evolution of Mg-3Sn-2Al-1Zn-5Li magnesium alloy during hot deformation is studied by hot compression tests over the temperature range of 200–350 °C under the strain rate of 0.001–1 s−1, whereafter constitutive equations and processing maps are developed and constructed. In most of cases, the material shows typical dynamic recrystallization (DRX) features, with a signal peak value followed by a gradual decrease. The value of Q (deformation activation energy) is 138.89414 kJ/mol, and the instability domains occur at high strain rate but the stability domains are opposite, and the optimum hot working parameter for the studied alloy is determined to be 350 °C/0.001 s−1 according to the processing maps. Within 200–350 °C, the operating mechanism of dynamic recrystallization (DRX) of Mg-3Sn-2Al-1Zn-5Li alloy during hot deformation is mainly affected by strain rate. Dynamic recrystallization (DRX) structures are observed from the samples at 300 °C/0.001 s−1 and 350 °C/0.001 s−1, which consist of continuous DRX (CDRX) and discontinuous DRX (DDRX). However, dynamic recovery (DRV) still dominates the softening mechanism. At the grain boundaries, mass dislocation pile-ups and dislocation tangle provide sites for potential nucleation. Meanwhile, flow localization bands are observed from the samples at 200 °C/1 s−1 and 250 °C/0.1 s−1 as the main instability mechanism.

show abstract

“…It is used in many fields such as vehicles, aircrafts, and military industry, due to its great advantages including low density, high strength/weight ratio, etc. [1,2], while the unique crystal structure, the existence of microporosity, and coarse microstructure limit its application and development. To solve these problems, researchers have developed some technologies.…”

Section: Introductionmentioning

confidence: 99%

Application of Ultrasonics on Preparation of Magnesium Alloys

Chen¹,

Le²

2020

Sonochemical Reactions

Self Cite

View full text Add to dashboard Cite

This chapter mainly describes the application of ultrasonic on preparation of magnesium alloys, which includes all of the interesting and novel research results of authors in the past decade. The chapter includes the following topics to readers: the ultrasonic cavitation behavior in magnesium alloys; the effect of ultrasonic treatment on melt structure; ultrasonic degassing of magnesium alloys; effect of ultrasonic melt treatment on microstructure of magnesium alloys; dual-frequency ultrasonic treatment on solidification of magnesium alloys; and ultrasonic directchill (DC) casting process of magnesium alloys billets, including the novel variablefrequency ultrasonic technology. The chapter almost covers all the aspects of ultrasonic application on preparation of magnesium alloys and can help readers have a systematic understanding of ultrasonic melt treatment on magnesium alloys.

show abstract

Comparison study of hot deformation behavior and processing map of AZ80 magnesium alloy casted with and without ultrasonic vibration

Cited by 75 publications

References 28 publications

Hot Compression Deformation and Activation Energy of Nanohybrid-Reinforced AZ80 Magnesium Matrix Composite

Hot Compression Deformation and Activation Energy of Nanohybrid-Reinforced AZ80 Magnesium Matrix Composite

Characterization of Hot Deformation Behavior and Processing Maps of Mg-3Sn-2Al-1Zn-5Li Magnesium Alloy

Application of Ultrasonics on Preparation of Magnesium Alloys

Contact Info

Product

Resources

About