Thermal Stability, Grain Growth Kinetics, and Mechanical Properties of Bulk Ultrafine-Grained AA6063/SiC Composites with Varying Reinforcement Sizes

A detailed study was performed on the grain growth kinetics of ultrafine-grained AZ61 magnesium alloy produced by accumulative roll bonding by carrying out isothermal annealing treatments on the roll bonded samples. Annealing treatments were carried out in the temperature range 423 to 573K for 2 to 120 minutes. As the annealing time and temperature increased, the grain size increased. The effect of annealing temperature and time, on the grain growth can be well explained by the kinetic equation and Arrhenius equation. Based on the experimental results of grain growth during annealing treatments, the grain growth exponent and the activation energy for grain growth were determined. The grain growth kinetic parameters were compared with other magnesium alloys processed by various methods.

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Mechanical properties and grain growth kinetics in magnesium alloy after accumulative compression bonding

Materials & Design (1980-2015) ◽

10.1016/j.matdes.2012.12.039 ◽

2013 ◽

Vol 47 ◽

pp. 505-509 ◽

Cited By ~ 17

Author(s):

Jijun Ma ◽

Xuyue Yang ◽

Qinghuan Huo ◽

Huan Sun ◽

Jia Qin ◽

...

Keyword(s):

Mechanical Properties ◽

Magnesium Alloy ◽

Grain Growth ◽

Growth Kinetics ◽

Grain Growth Kinetics

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Study of Grain Growth Kinetics in Submicrocrystalline Armco-Iron

Materials Science Forum ◽

10.4028/www.scientific.net/msf.550.465 ◽

2007 ◽

Vol 550 ◽

pp. 465-470 ◽

Cited By ~ 2

Author(s):

A.N. Aleshin ◽

Alex M. Arsenkin ◽

Sergey V. Dobatkin

Keyword(s):

Thermal Stability ◽

High Temperature ◽

Low Temperature ◽

Grain Growth ◽

Growth Kinetics ◽

Armco Iron ◽

High Temperature Annealing ◽

Grain Growth Kinetics ◽

Submicrocrystalline Materials ◽

Thermal Stability Of

The paper is devoted to the problem of thermal stability of ultra-fine grained (submicrocrystalline) materials prepared by severe plastic deformation. A basis of the paper lies in a fact that there is practically no grain growth in submicrocrystalline materials when annealing temperature is less than 0.35Tm. Reasons of high thermal stability of submicrocrystalline materials at low temperatures are widely discussed in literature. One of them is the affect of triple junction drag on grain boundaries motion. During annealing at a low temperature triple junction drag controls microstructure evolution in submicrocrystalline materials, and this phenomenon can be used to improve their thermal stability at high temperatures. The aim of this paper is to investigate grain growth kinetics in a two-step regime, low temperature and high temperature annealing. The experiments on grain growth were performed in submicrocrystalline Armco-iron fabricated by high pressure torsion. It is established that long-time low temperature pre-annealing reduces the grain growth rate in following high temperature annealing by a factor greater than two.

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