Effect of Extruding Technology on Microstructure and Properties of Al-Li Alloy

Shi, Qi Nian; Xiong, Wei Hao

doi:10.4028/www.scientific.net/KEM.353-358.695

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Effect of an Electric Field on the Texture and Microstructure Evolution during Annealing of High Reduction Cold-Rolled Ni
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Characteristic of Deformation of Ti-6Al-4V Alloy with Hydrogen at High Temperature
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Study on Cavity Growth in Uniaxial Tension of ZK60 Magnesium Alloy
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High Temperature Deformation Mechanism of 7075 Aluminum Alloy
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Effect of Extruding Technology on Microstructure and Properties of Al-Li Alloy
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The Influence of Aging Process on Microstructures and Properties of an Al-2.54Li-1.61Cu-1.23Mg-0.22Zr Alloy
p.699

The Influence of Pre-Annealing on Recrystallization in Heavily Cold-Rolled Nickel
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Deformation and Annealing Textures of Extruded and Cold Rolled Pure Ni Single Crystals of Cube Orientation
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Grain Orientation Dependence of Extended Planar Dislocation Boundaries in Cold-Rolled Polycrystalline Aluminium
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Home Key Engineering Materials Progresses in Fracture and Strength of Materials...Effect of Extruding Technology on Microstructure...

Effect of Extruding Technology on Microstructure and Properties of Al-Li Alloy

Abstract:

By the test of Al-Li-Cu-Mg-Zr Alloy’s mechanical property and microstructure in various kinds of extrusion technology, the effect of extrusion processing parameter on the structure and property of the alloy was analyzed, and the parameter’s range for obtaining proper compromise of strength and toughness was discussed.

Info:

Periodical:

Key Engineering Materials (Volumes 353-358)

Main Theme:

Progresses in Fracture and Strength of Materials and Structures

Edited by:

Yu Zhou, Shan-Tung Tu and Xishan Xie

Pages:

695-698

DOI:

https://doi.org/10.4028/www.scientific.net/KEM.353-358.695

Citation:

Q. N. Shi and W. H. Xiong, "Effect of Extruding Technology on Microstructure and Properties of Al-Li Alloy", Key Engineering Materials, Vols. 353-358, pp. 695-698, 2007

Online since:

September 2007

Authors:

Qi Nian Shi, Wei Hao Xiong

Keywords:

Al-Li Alloy, Extrusion, Microstructure, Process Parameter, Property Analysis

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References

[1] YIN Deng-feng, ZHEN Zi-qiao: Mater. Rev. Vol. 17(2) (2003), pp.18-20.

[2] B. M. Gable, A. W. Zhu, A. A. Csontos, E. A. Starke: J. Light Metals. Vol. 1 (2001), pp.1-14.

[3] Zdeněk Drozd, Zuzanka Trojanová, Stanislav Kúdela. J. Alloys Compou. Vol. 378 (2004), pp.192-195.

DOI: https://doi.org/10.1016/j.jallcom.2004.01.040

[4] Acosta E, Garcia O, Dakessian A: Mater. Sci. Forum, Vol. 39 (2002), pp.1157-1162.

[5] Fragomen J M, Wheeler R: Mater. Sci. Forum, Vol. 426 (2003), pp.309-314.

Paper TitlePages

Mechanical Properties of Ultra-Fine Grained Al-Li Alloys

Authors: Bogusława Adamczyk-Cieślak, Małgorzata Lewandowska, Jaroslaw Mizera, Krzysztof Jan Kurzydlowski

Abstract: The results obtained in the present study reveal the effect of equal channel angular extrusion (ECAE) on the grain size and mechanical properties of Al-Li alloys. During 8 passes of ECAE process, coarse grain microstructure in the initial state transforms into ultrafine grained. The final grain size depends on both total strain applied and Li content in the alloy. Due to the grain refinement the microhardness and yield stress increase by 100%. During compression deformation, the coarse grain alloys exhibit continuous hardening, whereas in the ultrafine-grained alloys, a stagnation of work hardening at the beginning of compression deformation is observed. This behaviour is related to the dynamic recovery of the severely deformed microstructure.

The Influence of Aging Process on Microstructures and Properties of an Al-2.54Li-1.61Cu-1.23Mg-0.22Zr Alloy

Authors: Qi Nian Shi, Wei Hao Xiong, Sheng Guo Liu

Abstract: The influence of aging process on microstructures and mechanical properties of a rapid solidification Aluminum-Lithium alloy has been analyzed in this paper. The results show that the better aging process is as follows: heating to 170oC for 4 hours and then followed by a final aging at about 190 oC for 18 hours. A lot of fine participated second phase such as δ′ in matrix and a narrow participation free band make alloy’s good performance.

699

TEM Studies on the Effect of Nature of Precipitates in Al-Li Alloy on Microstructural Evolution during Severe Plastic Deformation

Authors: Sivaswamy Giribaskar, Gouthama, Rajesh Prasad

Abstract: Equal channel angular extrusion (ECAE), involving intense plastic straining under high applied pressure is generally recognized and extensively studied top down approach for producing bulk ultra-fine grained (UFG) metallic materials, and even going down in size to the nanometer range. In this research efforts are made to identify conditional under which grains with size less than 100 nm form after ECAE. Evolution of microstructure of Al-Li based alloy processed by ECAE is analyzed using transmission electron microscopy (TEM). Observations on the effect of precipitates/second phase particles in the sample on the deformation characteristics and their role on the increased degree of grain fragmentation process is highlighted. Samples of Al-Li based alloy are solutionized, quenched and aged at different temperatures to obtain well formed precipitate laths/plates before subjecting to ECAE. During the deformation process these precipitates disintegrate into fragments and get dispersed into the Al matrix. The fragments of a few nanometers size bring about drastic changes in the flow as well as the recovery characteristics of processed samples. Evidence for dynamic recrystallisation taking place during the ECAE processing is presented. It was observed that optimal thermal treatment leads to more effective grain refinement and consequently an ultra-fine grained microstructure could be achieved even after single pass in Al-Li based alloy containing precipitates and second phase particles.

411

Microstructure and Mechanical Properties of Al-Li Alloy 2397-T87 Rolled Plate

Authors: Chun Ping Fan, Zi Qiao Zheng, Min Jia, Ji Fa Zhong, Bin Cheng

Abstract: The microstructure, tensile property and fracture toughness of Al-Li alloy 2397-T87 rolled plate were investigated by optical microscopy, scanning electron microscopy, transmission electron microscopy, X-ray diffraction, tensile and plane-strain fracture toughness tests. The results show that a pronounced texture variation through the plate thickness was found. Near the surface, Goss texture dominated. While in the center of the plate, typical β fiber texture and a scattering of cube texture were observed. And the subsurface layer exhibited a very weak texture. From the center to the subsurface, the fraction of β fiber texture and cube texture decreased. In contrast, the fraction of shear type texture reaching the maximum in subsurface layer increased. The tensile properties in different layers along the thickness direction were inhomogeneous. The strengths near the surface were lower than those in the center. And the through-thickness strength properties variation in the rolling direction was more remarkable than that in the long transverse direction. In the same thickness layer, the fracture toughness and the strengths were anisotropic. The strengths in the rolling direction were higher than those in the long transverse direction and the short transverse direction, and the strengths in the short transverse direction were the lowest. The fracture toughness in L-T orientation was the highest, followed by that in T-L orientation, and the fracture toughness in S-L orientation was the lowest.

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