Textures and mechanical properties in rare-earth free quasicrystal reinforced Mg–Zn–Zr alloys prepared by extrusion

• Published in: Materials science & engineering. A, Structural materials : properties, microstructure and processing Structural materials : properties, microstructure and processing, 2011-07, Vol.528 (18), p.5871-5874
• Main Authors: Ohhashi, S., Kato, A., Demura, M., Tsai, A.P.
• Format: Article
• Language: English
• Subjects: Condensed matter: structure, mechanical and thermal properties; Cross-disciplinary physics: materials science; rheology; Deformation and plasticity (including yield, ductility, and superplasticity); Exact sciences and technology; Extrusion; Magnesium; Magnesium base alloys; Magnesium extrusion; Materials science; Mechanical and acoustical properties of condensed matter; Mechanical properties of solids; Mechanical property; Microstructure; Other heat and thermomechanical treatments; Physics; Quality control; Quasicrystalline; Rare earth metals; Rare-earth free; Surface layer; Texture; Treatment of materials and its effects on microstructure and properties
• ISSN: 0921-5093; 1873-4936
• DOI: 10.1016/j.msea.2011.04.014

► Powder-metallurgical warm extrusion made quasicrystal dispersing Mg alloys. ► Mg extrusions containing quasicrystals showed randomized textures. ► These extrusion showed the enhancement of mechanical properties at 150 °C. Microstructure and mechanical properties of quasicrystals dispersed Mg alloys prepared by warm extrusion of the mixtures of Mg and Zn–Mg–Zr quasicrystalline (Qc) powders have been studied. Strong texture oriented along a 1   0   1 ¯   0 direction observed in pure Mg was reduced in Qc-dispersed samples, as verified by pole figure method and electron back scattering diffraction. The ultimate tensile strengths at 150 °C for Qc-dispersed extrusions were much higher than 110 MPa for pure Mg, which drastically reached 156 MPa for 15 wt.% Qc by preventing the motion of dislocations. Elongation was improved by the randomization of grain orientation: from 5.7% for pure Mg to 12.9% for 10 wt.% Qc at room temperature; from 15% for pure Mg to 37.1% for 5 wt.% Qc at 150 °C.