Kinetics of Hot Deformation in Mg/Nano-Al2O3 Composite

The hot deformation behavior of extruded Mg/nano-Al2O3 composite has been studied in the temperature and strain rate ranges of 300-500°C and 0.0003-10 s-1. In the lower strain rate regime (<0.1 s-1), the apparent activation energy evaluated is much higher than that for lattice self-diffusion. At higher strain rates, the behavior of the composite is similar to that of the matrix material and is controlled by grain boundary self diffusion. The prior particle boundaries in the composite, which are decorated by the nano-alumina particles, are stable and only kink under compression parallel to the extrusion direction.

[1]  M. Tan,et al.  High-temperature tensile properties of Mg/Al2O3 nanocomposite , 2008 .

[2]  K. P. Rao,et al.  Hot workability characteristics of cast and homogenized Mg–3Sn–1Ca alloy , 2008 .

[3]  Mark W. Verbrugge,et al.  Magnesium global development: Outcomes from the TMS 2007 annual meeting , 2007 .

[4]  Sie Chin Tjong,et al.  Novel Nanoparticle‐Reinforced Metal Matrix Composites with Enhanced Mechanical Properties , 2007 .

[5]  K. P. Rao,et al.  Hot Deformation Mechanisms and Microstructural Control in High‐Temperature Extruded AZ31 Magnesium Alloy , 2007 .

[6]  M. A. Rodríguez,et al.  High temperature mechanical properties of Mg–Y2O3 composite: Competition between texture and reinforcement contributions , 2007 .

[7]  M. Gupta,et al.  Development of nano-Y2O3 containing magnesium nanocomposites using solidification processing , 2007 .

[8]  K. P. Rao,et al.  Effect of crystallographic texture on the kinetics of hot deformation of rolled Mg-3Al-1Zn alloy plate , 2006 .

[9]  M. Gupta,et al.  Simultaneously Improving Strength and Ductility of Magnesium using Nano‐size SiC Particulates and Microwaves , 2006 .

[10]  H. Friedrich,et al.  Magnesium Technology - Metallurgy, Design Data, Applications , 2006 .

[11]  M. Gibson,et al.  Current wrought magnesium alloys: Strengths and weaknesses , 2005 .

[12]  G. Garcés,et al.  Effect of the extrusion texture on the mechanical behaviour of Mg–SiCp composites , 2005 .

[13]  M. Gupta,et al.  Enhancing Overall Mechanical Performance of Metallic Materials using Two-directional Microwave Assisted Rapid Sintering , 2005 .

[14]  M. Gupta,et al.  Development of high performance magnesium nano-composites using nano-Al2O3 as reinforcement , 2005 .

[15]  K. P. Rao,et al.  Processing maps and rate controlling mechanisms of hot deformation of electrolytic tough pitch copper in the temperature range 300–950 °C , 2005 .

[16]  D. Dunand,et al.  Creep of magnesium strengthened with high volume fractions of yttria dispersoids , 2001 .

[17]  H. Ferkel,et al.  Magnesium strengthened by SiC nanoparticles , 2001 .

[18]  T. Langdon,et al.  Deformation mechanisms in h.c.p. metals at elevated temperatures—I. Creep behavior of magnesium , 1981 .

[19]  J. Čadek,et al.  High temperature creep mechanisms in magnesium , 1970 .

[20]  John J. Jonas,et al.  Strength and structure under hot-working conditions , 1969 .