Superplastic Behaviour of AZ61-F Magnesium Composite Materials

Abstract Deformation of AZ61-F magnesium alloys with 1 wt % of Al2O3 phase was tested at different temperatures and different strain rates. It was shown that at temperatures 473–523 K and the highest strain rate applied from 1×10–2 s–1 to 1×10–4 s–1, a significant ductility growth was observed. The grain size of 0.6–0.8 μm was reached by severe plastic deformations by means of equal channel angular pressing (ECAP). Secondary Mg17Al12 and Al2O3 phases were identified. Maximum strain was gained at temperature of 473 K and strain rate of 1×10–4 s–1.

[1]  M. Gupta,et al.  Enhancing overall tensile behavior or ductility of AZ91D using nano- Al2O3 and heat treatment , 2011 .

[2]  Xiaochun Li,et al.  Study on tensile properties and microstructure of cast AZ91D/AlN nanocomposites , 2008 .

[3]  Abdel-Wahab El-Morsy,et al.  Microstructural and mechanical properties evolution of magnesium AZ61 alloy processed through a combination of extrusion and thermomechanical processes , 2008 .

[4]  M. Gupta,et al.  Effect of particulate size of Al2O3 reinforcement on microstructure and mechanical behavior of solidification processed elemental Mg , 2006 .

[5]  T. Langdon,et al.  Exceptional superplasticity in an AZ61 magnesium alloy processed by extrusion and ECAP , 2006 .

[6]  T. Langdon,et al.  An investigation of cavity growth in a superplastic aluminum alloy processed by ECAP , 2005 .

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

[8]  T. Langdon,et al.  Influence of ECAP on precipitate distributions in a spray-cast aluminum alloy , 2005 .

[9]  Terence G. Langdon,et al.  The process of grain refinement in equal-channel angular pressing , 1998 .

[10]  A. Ureña,et al.  Tem characterization of diffusion bonding of superplastic 8090 Al-Li alloy , 1996 .

[11]  W. T. Roberts,et al.  Superplasticity and the development of dislocation structures in an Al-4.5% Mg alloy , 1996 .

[12]  K. Higashi.  Positive exponent superplasticity in advanced aluminum alloys with nano or near-nano scale grained structures , 1993 .

[13]  T. Bieler,et al.  Texture changes during superplastic deformation of mechanically alloyed aluminium IN90211 , 1993 .

[14]  T. Bieler,et al.  On the superplastic behaviour of mechanically alloyed aluminium alloys , 1992 .

[15]  T. Nieh,et al.  A rheological view of high-strain-rate superplasticity in alloys and metal-matrix composites , 1992 .

[16]  A. Götte,et al.  Metall , 1897 .