| Title |
Deformation Behavior of Al-Mg/B4C and Al-Mg/TiC Composites Fabricated by Pressureless Infiltration Technique |
| Authors |
김종민(Jong Min Kim),맹덕영(Duck Young Maeng),홍순익(Sun Ig Hong),권훈(Hoon Kwon) |
| ISSN |
1738-8228(ISSN), 2288-8241(eISSN) |
| Abstract |
Deformation behaviors of Al-MgB₄C and Al-Mg/TiC composites fabricated by pressureless infiltration technique were studied in the temperature range between 298K and 773K. The strength decreased similarly for Al-MgB₄C and Al-Mg/TiC composites, but the ductility of Al-Mg/B₄C was higher and reached to 150% at 773K. The stress exponents and the activation energy for high temperature deformation were observed to be 7∼8 and 180∼220 KJ/mole respectively. The relatively high stress exponent and high activation energy can be explained in terms of dynamic solution-dislocation interaction in the matrix of Al-Mg composites. The activation volume for high temperature deformation of Al-Mg matrix composites increased from 50-80b³ at 573K to 200-800b³ at 773K. The rate controlling mechanism of the deformation for Al-Mg matrix composites was well explained by the dislocation trough model in which the segregation of alloying elements on dislocation determines the activation length. |