Journal
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
Volume 771, Issue -, Pages -Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.msea.2019.138578
Keywords
High-pressure torsion; Hybrid; Intermetallic; Nanoindentation; Zn-Mg
Categories
Funding
- National Science Foundation Division of Materials Research through the Metals and Metallic Nanostructures (MMN) program [DMR1607942]
- National Science Foundation Division of Materials Research [DMR-1810343]
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Heterostructured metals have attracted increasing interest because of their unique capability to overcome the strength-ductility tradeoff typically observed in engineering materials. Here, a new strategy for synthesizing heterostructured Zn-Mg hybrids is proposed via high-pressure torsion (HPT) followed by post-deformation annealing (PDA). Experimental results indicate a transition from a relatively homogenous nanograined structure after HPT, to a heterogeneous microstructure, containing a distribution of Mg2Zn11 and MgZn2 intermetallic nanoprecipitates, upon subsequent PDA. This led to a simultaneous increase in hardness and strain rate sensitivity. The observed three-regime strain hardening behavior was suggested to be due to the activation of multiple strengthening mechanisms, including grain refinement, in-situ precipitation, and back-stress strengthening associated with geometrically necessary dislocations. Thus, the mechanical response of Zn-Mg hybrids may be tailored to obtain the desired response for task-specific applications.
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