Effect of Zener-Hollomon parameter on quench sensitivity of 7085 aluminum alloy

Li, Chengbo; Wang, Shaolin; Zhang, Duan-zheng; Liu, Shengdan; Shan, Zhaojun; Zhang, Xinming

doi:10.1016/j.jallcom.2016.07.089

Cited by 45 publications

(7 citation statements)

References 21 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…It was indicated that the η′ phase (MgZn 2 ) and Al 3 Zr phases can be found in AA7097 (320°C/0 s). However, coarse rod-shaped quench-induced η phase (MgZn 2 , hexagonal crystal structure, lattice parameter a=0.515-0.521 nm, c=0.848-0.869 nm [22][23][24]) was nucleated on Al 3 Zr dispersoids after isothermally holding for 30 s at 320°C, which was similar to findings from former works [4,25,26]. Moreover, the coarse and discontinuous GBPs and the precipitates free zone (PFZ) appeared after isothermally holding for 30 s at 320°C.…”

Section: The Conductivity Measurement and Ttt Curvessupporting

confidence: 88%

Study on quenching sensitivity of 7097 aluminum alloy

Xie

Chen

et al. 2019

Mater. Res. Express

View full text Add to dashboard Cite

The time-temperature-property (TTP) and the time-temperature-transformation (TTT) curves of 7097 aluminum alloy are determined by interrupted quenching experiments in order to investigate the quench sensitivity. The quenching sensitive zone is 230°C-370°C, and the nose temperature and transformation time are about 320°C and 1.2 s, respectively. The evolution of quench-induced precipitates during different isothermal temperatures treatment has been observed by the transmission electron microscope. The number and size of quench-induced precipitates are gradually increased with the extension of isothermal holding time. Moreover, the quenching sensitivity of 7097 aluminum alloy is lower than that of 7055 aluminum alloy and 7050 aluminum alloy, but higher than that of 7085 aluminum alloy, and the influence of alloy composition on the quenching sensitivity is investigated.

show abstract

Section: The Conductivity Measurement and Ttt Curvessupporting

confidence: 88%

Study on quenching sensitivity of 7097 aluminum alloy

Xie

Chen

et al. 2019

Mater. Res. Express

View full text Add to dashboard Cite

show abstract

“…There is a certain functional relationship between  , Q and T during hot deformation. Z parameters can be introduced to express this relationship [53][54][55][56] :…”

Section: Arrhenius Modelmentioning

confidence: 99%

Comparative Study on Constitutive Models for 21-4N Heat Resistant Steel During High Temperature Deformation

Li¹,

Ji²,

Cai³

et al. 2019

Preprint

View full text Add to dashboard Cite

The Gleeble-1500D thermal simulation test machine was used to conduct the isothermal compression test on 21-4N at the strain rate ( ) of 0.01-10s-1, the deformation temperature (T) of 1273-1453K and the maximum deformation is 0.916. The data of the stress-strain ( - )were obtained. Based on the - data, the Johnson-Cook (J-C), modified J-C, Arrhenius and Back-Propagation Artificial Neural Network (BP-ANN) models were established. The accuracy of four models were verified, analyzed and compared. The results show that J-C model has a higher accuracy only under reference deformation conditions. When the deformation condition changes greatly, the accuracy of J-C model is significantly reduced. The coupling effect of T and of modified J-C model is considered, and the prediction accuracy is greatly improved The Arrhenius model introduces Zener-Hollomon (Z) to represent the coupling effect of T and , it has a fairly high prediction accuracy. And it can predict flow stress ( ) accurately at different conditions. The accuracy of BP-ANN model is the highest, but its learning rate is low, the learning and memory are unstable. It has no memory for the weights and thresholds of the completed training. So, there are certain limitations of it in use. Finally, a FEM of the isothermal compression experiment for four models were established, and the distribution of the equivalent stress field, equivalent strain field and temperature field with the deformation degree of 60% were obtained.

show abstract

“…There is a certain functional relationship between trueε˙, Q and T during hot deformation. Z parameters can be introduced to express this relationship [60,61,62,63]:Z=trueε˙exp(−Q/RT)…”

Section: Resultsmentioning

confidence: 99%

Comparative Study on Constitutive Models for 21-4N Heat Resistant Steel during High Temperature Deformation

Cai

et al. 2019

Materials

View full text Add to dashboard Cite

The Gleeble-1500D thermal simulation test machine was used to conduct the isothermal compression test on 21-4N at the strain rate ( ε ˙ ) of 0.01–10 s−1, the deformation temperature (T) of 1273–1453 K and the maximum deformation is 0.916. The data of the stress-strain (σ-ε) were obtained. Based on the σ-ε data, the Johnson-Cook (J-C), modified J-C, Arrhenius and Back-Propagation Artificial Neural Network (BP-ANN) models were established. The accuracy of four models were verified, analyzed and compared. The results show that J-C model has a higher accuracy only under reference deformation conditions. When the deformation condition changes greatly, the accuracy of J-C model is significantly reduced. The coupling effect of T and ε ˙ of modified J-C model is considered, and the prediction accuracy is greatly improved The Arrhenius model introduces Zener-Hollomon (Z) to represent the coupling effect of T and ε ˙ , it has a fairly high prediction accuracy. And it can predict flow stress (σ) accurately at different conditions. The accuracy of BP-ANN model is the highest, but its learning rate is low, the learning and memory are unstable. It has no memory for the weights and thresholds of the completed training. So, there are certain limitations of it in use. Finally, a Finite Element Method (FEM) of the isothermal compression experiment for four models were established, and the distribution of the equivalent stress field, equivalent strain field and temperature field with the deformation degree of 60% were obtained.

show abstract

Effect of Zener-Hollomon parameter on quench sensitivity of 7085 aluminum alloy

Cited by 45 publications

References 21 publications

Study on quenching sensitivity of 7097 aluminum alloy

Study on quenching sensitivity of 7097 aluminum alloy

Comparative Study on Constitutive Models for 21-4N Heat Resistant Steel During High Temperature Deformation

Comparative Study on Constitutive Models for 21-4N Heat Resistant Steel during High Temperature Deformation

Contact Info

Product

Resources

About