Effect of Strong Magnetic Field on the Discontinuous and Continuous Precipitation in AZ91 Mg Alloy

2005 ◽  
Vol 488-489 ◽  
pp. 849-852 ◽  
Author(s):  
Jie Dong ◽  
Z.F. Li ◽  
Xiao Qing Zeng ◽  
Chen Lu ◽  
Wen Jiang Ding
Keyword(s):  
Magnetic Field ◽  
Grain Boundary ◽  
Aging Process ◽  
Volume Diffusion ◽  
Discontinuous Precipitation ◽  
Boundary Migration ◽  
Grain Boundary Migration ◽  
Az91 Magnesium Alloy ◽  
Continuous Precipitation ◽  
Az91 Magnesium

A strong static magnetic field (SSMF) of about 10 T was introduced to the aging process of AZ91 magnesium alloy. Comparing with conventional aging, in the first stage of aging with SSMF, discontinuous precipitation of Mg17Al12 at grain boundary was accelerated. The magnetically induced grain boundary migration might be responsible for this acceleration effect. The density of the Mg17Al12 continuous precipitates inside the grains was increased and the precipitation plates became thinner in SSMF pre-aged specimens, which might be ascribed to the retarded volume diffusion resulted from the SSMF.

Effects of Erbium Addition on the Corrosion Resistance and Microstructure of AZ91 Magnesium Alloy

2011 ◽  
Vol 194-196 ◽  
pp. 1221-1224 ◽  
Author(s):  
Zhong Jun Wang ◽  
Yang Xu ◽  
Jing Zhu
Keyword(s):  
Corrosion Resistance ◽  
Magnesium Alloy ◽  
Magnesium Alloys ◽  
Discontinuous Precipitation ◽  
Az91 Magnesium Alloy ◽  
Continuous Precipitation ◽  
Az91 Magnesium ◽  
Precipitation Phase

The microstructures and corrosion resistance of AZ91 and AZ91+0.5 wt.% erbium (Er) magnesium alloys were studied, respectively. The results show that the Er addition in scrap AZ91 magnesium alloy can improve the corrosion resistance, markedly. The discontinuous precipitation phase (DPP) for Mg17Al12was retarded and the amount of DPP was decreased by 41% due to the formation of Al8ErMn4phase during solidification. The amount of continuous precipitation phase (CPP) in grains was decreased by 8% because of the formation of Al7ErMn5phase during solidification.

scholarly journals Grain Boundary Migration in Fe–3mass%Si Alloy Bicrystals under a Magnetic Field

2010 ◽  
Vol 50 (4) ◽  
pp. 591-595 ◽  
Author(s):  
Sadahiro Tsurekawa ◽  
Kyosuke Inoue ◽  
Pavel Lejček
Keyword(s):  
Magnetic Field ◽  
Grain Boundary ◽  
Boundary Migration ◽  
Grain Boundary Migration

Grain Boundary Migration and Grain Growth Texture Evolution in Zn in a High Magnetic Field

2011 ◽  
Vol 702-703 ◽  
pp. 635-638
Author(s):  
Christoph Günster ◽  
Dmitri A. Molodov ◽  
Günter Gottstein
Keyword(s):  
Magnetic Field ◽  
Grain Boundary ◽  
Grain Growth ◽  
Texture Evolution ◽  
Boundary Migration ◽  
Activation Parameters ◽  
Boundary Plane ◽  
Grain Boundary Migration ◽  
Cold Rolled

The magnetically driven motion of planar symmetrical and asymmetrical <> tilt grain boundaries in high purity (99,995%) zinc bicrystals was measured in-situ by means of a po­la­rization microscopy probe in the temperature range between 330°C and 415°C and the corres­pon­ding migration activation parameters were obtained. The results revealed that grain boundary mobi­lity essentially depends on the misorientation angle and the inclination of the boundary plane. The magnetic annealing of the cold rolled (90%) Zn-1.1%Al sheet specimens resulted in an asymmetry of the two major texture components. This effect is attributed to a magnetic driving force for grain growth. The grain microstructure evolution was also essentially affected by a magnetic field.

A New Model for Discontinuous and Continuous Precipitation in AZ91 Magnesium Alloy

2014 ◽  
Vol 783-786 ◽  
pp. 461-466
Author(s):  
J.D. Robson
Keyword(s):  
Heat Treatment ◽  
Discontinuous Precipitation ◽  
Solution Treatment ◽  
Az91 Magnesium Alloy ◽  
Continuous Precipitation ◽  
New Model ◽  
Alloy Az91 ◽  
Suitable Heat Treatment ◽  
Az91 Magnesium ◽  
Zn Alloy

The Mg-Al-Zn alloy AZ91 is age hardenable, forming precipitates of –Mg17Al12 after suitable heat treatment. In this alloy both continuous and discontinuous precipitation canoccur. These modes are in competition and lead to very different microstructures. In this paper,a new model is developed to predict this competitive precipitation. The model is validated usingliterature data and then used to study the competition between precipitation modes and predictthe effect of cooling rate from solution treatment on the microstructure expected in AZ91.

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