Abstract
Highly-dense ultrafine grain Mg–7.4%Al bulk samples with grain size of about 300nm have been produced by powder metallurgy through hot consolidation of mechanically alloyed powders. Room temperature compression tests of the consolidated bulk material reveal remarkable mechanical properties: high compressive strength of about 690MPa combined with a plastic strain exceeding 9%. The high strength of the alloy can be attributed to the combination of three different strengthening mechanisms: grain size refinement, dispersion strengthening and solid solution strengthening. The fracture surface shows trans-granular quasi-cleavage fracture in nature. The MgO rich regions often acted as the microcrack initiation source and thereby stop the main crack. Uniformly distributed intermetallic (γ-Al12Mg17) particles in the matrix deflected main crack and resulted a tortuous crack path. These results demonstrate that powder metallurgy, mechanical alloying combined with hot consolidation is a suitable method for the production of nanostructured Mg-based materials characterized by high strength and considerable plastic deformation.
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
