The Annealing Behavior of cryoECAP Processed Pure Aluminum under High Magnetic Field

The property and microstructure of pure Al prepared by the cryogenic ECAP after annealing at different temperatures and times with and without the application of 12T high magnetic field were investigated by hardness test and optical microscopy observation. The results show that with the application of high magnetic field, the hardness of cryo-ECAPed pure Al is lower than that of material annealing without high magnetic field. The high magnetic field accelerates crystallization of cryo-ECAPed pure Al during annealing.

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The Influence of High Magnetic Field on the Stability of CryoECAPed 1050 Alloy

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.774-776.968 ◽

2013 ◽

Vol 774-776 ◽

pp. 968-973

Author(s):

Yi Heng Cao ◽

Li Zi He ◽

Xiao Tao Liu ◽

Hai Tao Zhang ◽

Ping Wang ◽

...

Keyword(s):

Magnetic Field ◽

Mechanical Properties ◽

Grain Size ◽

Diffraction Pattern ◽

Grain Growth ◽

High Magnetic Field ◽

Hardness Test ◽

Abnormal Grain Growth ◽

Back Scattering ◽

The Stability

The evolutions of mechanical properties and microstructure of cryoECAPed 1050 alloy annealed at various temperatures from 150°C to 400°C for 1h with and without high magnetic field (HMF) were investigated by hardness test and electron back scattering diffraction pattern (EBSD) analysis. The abnormal grain growth happens in sample annealing at 400°C without a field. With the application of high magnetic field, the formation of the HABs is suppressed, the grain size distribution is homogeneous and no abnormal grain growth occurs.

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An Effect of High Magnetic Field on Grain Growth in Nanocrystalline Iron

Materials Science Forum ◽

10.4028/www.scientific.net/msf.539-543.2793 ◽

2007 ◽

Vol 539-543 ◽

pp. 2793-2797 ◽

Cited By ~ 1

Author(s):

W.P. Tong ◽

L.M. Wang ◽

G.J. Ma ◽

N.R. Tao ◽

Liang Zuo

Keyword(s):

Magnetic Field ◽

Grain Growth ◽

High Magnetic Field ◽

Early Stage ◽

Grain Structure ◽

Surface Mechanical Attrition Treatment ◽

Iron Sample ◽

Mechanical Attrition ◽

Different Temperatures ◽

Nanocrystalline Iron

A nanostructured surface layer on a pure iron sample was prepared by surface mechanical attrition treatment (SMAT). The thermal stability of SMAT sample was investigated at different temperatures with or without a high magnetic field (H =12T). It was found that a high magnetically annealing enhanced grain growth at the early stage of annealing, and produced a uniform nanocrystalline grain structure. After homogeneous grains developed, further grain growth became restrained.

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Annealing Behavior of the Compressed AZ31 Magnesium Alloy with Different Strain

Materials Science Forum ◽

10.4028/www.scientific.net/msf.546-549.267 ◽

2007 ◽

Vol 546-549 ◽

pp. 267-270

Author(s):

Tian Mo Liu ◽

Pan Xiao ◽

Fu Sheng Pan ◽

Qing Liu

Keyword(s):

Activation Energy ◽

Annealing Temperature ◽

Hardness Test ◽

Test Results ◽

Annealing Behavior ◽

Different Temperatures ◽

Calculated Activation Energy ◽

Calculated Activation ◽

Crystallographic Orientations ◽

Microhardness Tester

The cold-compressed AZ31 magnesium alloys with different (2.5%, 5%, 7.5%, 10%, 12.5% and 15%) were annealed at different temperatures (573, 623 and 673K) for different time. With aid of the optical microscopy, and microhardness tester, the microstructural evolution during annealing at different temperature of the compressed AZ31 has been investigated. The microstructural characterized results were further related to the hardness test results and the calculated activation energy. The results showed that for the compressed AZ31, the recrystallization can occur on the samples with the strain just above 10% and the deformation twinning plays an important role on the nucleation and grain growth of the recrystallization. It was found that the twinning boundary was the location of the recrystallization nuclei and a lot of recrystallized grains with equiaxed shape were found along the twinning boundaries. The relationships among the nuclei orientations and the crystallographic orientations on both sides of the twining boundary have been statistically investigated. The effects of the compressed strain and the annealing temperature on annealing behavior were also discussed based on the experimental results.

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