4.6 Article

Achieving high strength and high ductility in ZK60 alloy with a heterogeneous lamella structure

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MATERIALS LETTERS
卷 330, 期 -, 页码 -

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ELSEVIER
DOI: 10.1016/j.matlet.2022.133303

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Heterogeneous lamella; ZK60; Microstructure; Mechanical properties; Powder technology

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This study introduces a heterogeneous lamella (HL) structure in ZK60 alloy fabricated using conventional powder metallurgy techniques. The HL structure consists of soft coarse-grained (CG) lamella embedded in a hard ultrafine-grained (UFG) matrix, resulting in a synergistic combination of strength and elongation.
Heterogeneous structure emerges as a novel design philosophy for metal materials to break through the strength -ductility tradeoff. Here we present a heterogeneous lamella (HL) structure in ZK60 alloy that was fabricated by conventional powder metallurgy techniques, i.e., powder pretreatment and hot extrusion. The distinctive structure consists of soft coarse-grained (CG) lamella embedded in the hard ultrafine-grained (UFG) matrix. Compared to the homogeneous CG and UFG counterparts, the HL ZK60 alloy exhibits an excellent combination of tensile yield strength (404.4 MPa) and uniform elongation (13.5 %). This strength-ductility synergy can be attributed to the hetero-deformation induced (HDI) strengthening and HDI strain hardening as a result of the deformation incompatibility and mutual constraint between the hetero-zones.

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