Effect of Temperature on the Superplasticity of AZ81 Magnesium Alloy Processed by Hot Extrusion

Li Lin; Li Jia Chen; Zhen Liu

doi:10.4028/www.scientific.net/MSF.488-489.585

Paper Titles

Superplastic Forming of AZ31 Mg Alloy Recycled by Solid-State Processing
p.567

Press Forming Technology Using Superplastic Deformation for Mg Alloy Sheet
p.571

Superplasticity of Magnesium Alloy ZK40 Processed by Equal Channel Angular Pressing
p.575

An Investigation of Low Temperature Superplasticity of ZK40 Magnesium Alloy Subjected to Equal Channel Angular Pressing
p.581

Effect of Temperature on the Superplasticity of AZ81 Magnesium Alloy Processed by Hot Extrusion
p.585

Effect of Equal Channel Angular Extrusion on the Microstructure and Mechanical Properties of Magnesium Alloy Containing Quasicrystallines
p.589

Effect of Microstructures and Texture Development on Tensile Properties of Wrought Magnesium Alloys Processed by ECAE
p.593

Grain Refinement in Magnesium Alloy AZ31 during Multidirectional Forging under Decreasing Temperature Conditions
p.597

Microstructure Evolution and Mechanical Properties of AZ 31 Mg Alloy Processed by Equal Channel Angular Extrusion
p.601

HomeMaterials Science ForumMaterials Science Forum Vols. 488-489Effect of Temperature on the Superplasticity of...

Effect of Temperature on the Superplasticity of AZ81 Magnesium Alloy Processed by Hot Extrusion

Abstract:

An AZ81 magnesium alloy, which was processed by hot extrusion in advance, was tested in the temperature range of 473 ~ 623 K and at various initial strain rates, ranging from 1×10-1 to 1×10-4 s-1. True stress-true strain curves under various temperatures and activation energy within different temperature range were investigated for the analysis of effect of temperature on superplastic behaviors. Elongation of the as-extruded AZ81 alloy increased with temperature when tested at the same initial strain rate. Elongation values, obtained at the same initial strain rate of 1×10-3 s-1, were 94% at 473K and 446% at 623K, respectively. Deformation mechanisms varied with increasing temperature, from the grain boundary sliding (GBS) accommodated by grain boundary diffusion to the GBS accommodated by lattice diffusion, transition temperature was 573 K.

You might also be interested in these eBooks

Magnesium - Science, Technology and Applications

View Preview

Info:

Periodical:

Materials Science Forum (Volumes 488-489)

Pages:

585-588

DOI:

https://doi.org/10.4028/www.scientific.net/MSF.488-489.585

Citation:

Cite this paper

Online since:

July 2005

Authors:

Li Lin, Li Jia Chen, Zhen Liu

Keywords:

AZ31 Alloy, Deformation Mechanism, Superplasticity

Export:

RIS, BibTeX

Price:

Permissions CCC:

Request Permissions

Permissions PLS:

Request Permissions

Сopyright:

Citation:

References

[1] O. D. Sherby, J. Wadsworth: Prog. Mater. Sci. vol. 33 (1989), p.169.

Google Scholar

[2] M. J. Stowel: Superplastic Forming of Structural Alloys (TMS, USA 1998).

Google Scholar

[3] T. G. Nieh, J. Wadsworth: Scripta Metall. vol. 19 (1985), p.1375.

Google Scholar

[4] Z. Horita, M. Furukawa, M. Nemoto: Acta Mater. vol. 48 (2000), p.3633.

Google Scholar

[5] M. Mabuchi, K. Kubota, H. Higashi: Mater. Trans. JIM vol. 36 (1995), p.1249.

Google Scholar

[6] R. Raj, M. F. Ashby: Metall. Trans. vol. 2 (1971), p.1113.

Google Scholar

[7] H. Watanabe, T. Mukai, M. Kohzu, S. Tanabe: Acta Mater. Vol. 47 (1999), p.3753.

Google Scholar

[8] S. S. Vagarali, T. G. Langdon: Acta Metall. Vol. 29 (1981), p. (1969).

Google Scholar

[9] O. D. Sherby, J. Wadsworth: Deformation Processing and Structure Metals (ASM, USA 1982). 1. 4 1. 5 1. 6 1. 7 1. 8 1. 9 2. 0 2. 1 2. 2 10 -5 10 -4 10 -3 10 -2 10 -1 10 0 573 KAZ81: as-extruded ¦Ò/ G = 5. 4¡Á10 - 4 Q¡Ö62 KJ/mol grain boundary diffusion Q¡Ö138 KJ/mol lattice diffusion STRAIN RATE, s -1 T -1 ¡Á1000, K -1 Fig. 3: The variation in Q as a function of 1/T for the as-extruded AZ81 alloy.

Google Scholar