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Home  >  Journal list  >  MATERIALS TRANSACTIONS  >  Vol.55  No.2 (2014)  >  pp.270-274

MATERIALS TRANSACTIONS
<<Previous article Vol.55  No.2 (2014)   pp.270 - 274 Next article>>

Microstructure Evolution of AZ80 Magnesium Alloy during Multi-Directional Forging Process

Qingfeng Zhu1), Lei Li1), Zhiqiang Zhang1), Zhihao Zhao1), Yubo Zuo1), Jianzhong Cui1)
1) Key Laboratory of Electromagnetic Processing of Materials, Ministry of Education

Grain refinement of a magnesium alloy, AZ80, was studied in multi-directional forging (MDF) with decreasing temperatures from 683 to 573 K. The MDF was carried out up to accumulative true strains of around 7 with changing the loading direction from pass to pass. The structural changes are characterized by the alternate appearance of fine dynamic recrystallized (DRXed) grains (with many dynamic granular Mg17Al12 phases) and coarse DRXed grains (without Mg17Al12 phases) in the sample, the expansion of the fine grains area, and the refinement of (DRXed) grains in the fine grains area during the MDF process. The non-uniform dynamic precipitation of the Mg17Al12 phase may attribute to the inhomogenous Al content distribution in the Mg matrix. These Mg17Al12 phase retards the growth of the DRX grains, which in turn results in the formation and the expansion of the fine grains area during the MDF process with decreasing temperature.


Keyword:
AZ80 magnesium alloy, multi-directional forging, severe plastic deformation, dynamic recrystallization, precipitation

Received: July 03, 2013
Accepted: November 05, 2013 , Published online: January 25, 2014
Copyright © 2014 The Japan Institute of Metals and Materials

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