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Processing of AZ31 magnesium alloy by accumulative roll-bonding at gradient temperature

Acta Metallurgica Sinica(English Letters) 2012年第1期25卷 65-75页

作者： Meiyan ZHAN Chunming LI Weiwen ZHANG Datong ZHANG School of Materials Science and Engineering South China University of Technology Guangzhou 510640China National Engineering Research Center of Near-net-shape Forming for Metallic Materials South ChinaUniversity of Technology Guangzhou 510640 China

In the present investigation a wrought magnesium alloy AZ31 was successfully processed by the accumulative roll-bonding （ARB） at gradient temperature up to six cycles with the lowest temperature of 250 °C. This is performed through different thermomechanical processing routes （different ARB cycles at different temperatures of 350-200 °C）. The microstructures and mechanical properties were investigated. The results indicate that significant grain refinement is observed after the first two cycles at the highest ARB temperature as a result of dynamic recrystallization, which is necessary for the subsequently ARB cycles at relatively lower temperature with the aim to restrict grain growth. No significant finer grain size was observed through the fifth and sixth cycles while the microstructure homogeneity is further improved. The grain structure can be effectively refined at lower ARB processing temperature and higher cycles. The resulting material exhibited high strength and relatively high ductility at ambient temperature when ARB deformed above 250 °C. The mechanical properties of the ARB deformed materials are strongly dependent on several main factors： the amount and the homogeneity of strain achieved, grain size and microstructure homogeneity, textures developed during ARB and interface bonding quality.

关键词： Mg-Al-Zn magnesium alloy accumulative roll-bonding Microstructure Mechanical properties

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Development of through-thickness texture gradient and persistence of shear-type textures during annealing of commercial purity aluminium sheet processed by accumulative roll-bonding

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Journal of Materials Science & Technology 2018年第5期34卷 821-831页

作者： Saiyi Li Liang Yang Nan Qin School of Materials Science and Engineering Central South University Changsha 410083 China Key Laboratory of Nonferrous Metal Materials Science and Engineering of the Ministry of Education Central South University Changsha 410012 China

Ultrafine-grained commercial-purity aluminum（AA1070） sheets produced by four cycles of accumulative roll-bonding（ARB） without lubrication are subjected to annealing treatments in the temperature range from 250℃ to 400℃.Microstructures and microtextures in the surface and center regions of the ARBed and annealed sheets are measured by electron backscatter *** results show that annealing treatments at 325℃ or above lead to a reduction in the microstructure gradient but a significant through-thickness texture gradient different from that in the as-deformed *** center region is featured by the development of a strong cube texture at the expense of rolling *** the surface region,shear-type components are either enhanced or largely retained,showing a high persistency upon *** the grain structures are restored predominantly by continuous recrystallization in the surface region,a mixture of continuous and discontinuous recrystallization is envisaged for the center region.

关键词： accumulative roll-bonding Texture Annealing Recrystallization Shear deformation

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