4.7 Article

A TEM quantitative evaluation of strengthening in an Mg-RE alloy reinforced with SIC

Journal

MATERIALS CHARACTERIZATION
Volume 62, Issue 10, Pages 959-969

Publisher

ELSEVIER SCIENCE INC
DOI: 10.1016/j.matchar.2011.04.011

Keywords

Mg-RE alloy; Composite; Strengthening; SiC reinforcement; TEM; Compression

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Magnesium alloys containing rare earth elements are known to have high specific strength, good creep and corrosion resistance up to 523 K. The addition of SiC ceramic particles strengthens the metal matrix composite resulting in better wear and creep resistance while maintaining good machinability. The role of the reinforcement particles in enhancing strength can be quantitatively evaluated using transmission electron microscopy (TEM). This paper presents a quantitative evaluation of the different strengthening contributions, determined through TEM inspections, in an SIC Mg-RE composite alloy containing yttrium, neodymium, gadolinium and dysprosium. Compression tests at temperatures ranging between 290 and 573 K were carried out. The microstructure strengthening mechanism was studied for all the compression conditions. Strengthening was compared to the mechanical results and the way the different contributions were combined is also discussed and justified. (C) 2011 Elsevier Inc. All rights reserved.

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