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

Abstract

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.

Influence of strong static magnetic field on intermediate phase growth in Mg–Al diffusion couple

“…Among various kinds of magnetic field, static magnetic field has also been found to exert influence on metallurgical phenomena such as grain boundary migration [3,4], formation of texture [5,6] and phase transformation [7][8][9]. In many of these metallurgical processes, diffusion of atoms in the material is of great importance as it acts as the controlling factor in processes like homogenization and precipitation.…”

Impact of a Constant Magnetic Field on Decomposition of Cu-Be-Ni-Based Solid Solution

“…Furthermore, it was found that the dislocation motion can be easily activated under uniform magnetic field in the absence of any detectable external mechanical action [17,18]. While an enhancement of the precipitation reactions in a Mg alloy was already reported for the case of a strong, about 12 T, magnetic field [9], the present results reveal a significant impact of low-or moderate-intensity magnetic fields, of 0.7 T, on the decomposition kinetics of the supersaturated solid solution in generally diamagnetic Cu-Be-Ni alloy.…”

“…Moreover, texture and microstructure evolution in cold-rolled Al or Zr were found to be affected by a magnetic field, too [7,8]. Dong with co-workers [9] have investigated the influence of a static magnetic field of 10 T during aging of the magnesium alloy AZ91. An enhancement of discontinuous precipitation of the intermetallic phase Mg 17 Al 12 at grain boundaries was observed, alongside with a retardation of volume diffusion rates.…”

Intermediate Phase Growth of Mg-Al Diffusion Couple under a Strong Static Magnetic Field

“…A lot of researches have been carried out to investigate the influence of magnetic field on metallurgical phenomena such as grain boundary migration [1,2], precipitation [3], and phase transformation [4].…”