Research Papers

Effect of Initial Texture on Rollability of Mg-3Al-1Zn Alloy Sheet

[+] Author and Article Information
Q. Dai

e-mail: qingwei.dai@gmail.com

W. Lan

School of Metallurgy and Materials Engineering,
Chongqing University of Science and Technology,
Chongqing 401331, China

X. Chen

School of Metallurgy and Materials Engineering,
Chongqing University of Science and Technology,
Chongqing 401331, China
International Center for Applied Mechanics,
SV Lab, School of Aerospace,
Xi'an Jiaotong University,
Xi'an 710049, China

1Corresponding author.

Contributed by the Materials Division of ASME for publication in the JOURNAL OF ENGINEERING MATERIALS AND TECHNOLOGY. Manuscript received June 15, 2012; final manuscript received November 4, 2013; published online December 2, 2013. Assoc. Editor: Xi Chen.

J. Eng. Mater. Technol 136(1), 011005 (Dec 02, 2013) (5 pages) Paper No: MATS-12-1144; doi: 10.1115/1.4025976 History: Received June 15, 2012; Revised November 04, 2013

The influence of initial texture on rollability is investigated using cuneal AZ31 Mg alloy sheets. Upon large thickness reduction, the sheet with initial basal texture has many edge cracks, whereas the sheet is crack-free if its normal direction is orthogonal to c-axis of hexagonal close packed (HCP) lattice. Microstructural analysis shows that the former one has heterogeneous grain structure owing to grain-boundary-related recrystallization, and by contrast the later one has a more uniform microstructure for the twin-related recrystallization. The initial nonbasal texture can lead to excellent rollability and anisotropic deformation, based on which a new iterative approach of rolling is proposed, which may achieve large reduction in few passes.

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Grahic Jump Location
Fig. 1

(a) Positions of samples A and B in initial plate; (b) samples before rolling; (c) samples after rolling; (d) magnified photo of samples A and B

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Fig. 2

Pole figures of texture: (a) initial texture of sample A before rolling; (b) initial texture of sample B before rolling; (c) texture of sample A after being rolled with reduction of 40%; (d) texture of sample B after being rolled with reduction of 40%. (a) and (b) are the same with former work [13], for using the same material.

Grahic Jump Location
Fig. 3

Microstructure of samples A and B with different reductions. (a1) Sample A with reduction 20%; (a2) sample B with reduction 20%; (b1) sample A with reduction 40%; (b2) sample B with reduction 40%; (c1) sample A with reduction 60%; (c2) sample B with reduction 60%, close to the edge crack zone.

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Fig. 4

The new TD-ND-TD-ND rolling process sketch. The crystal lattice is illustrated during the process.




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