Abstract
Achieving appreciable strain-aging hardening coupling with fine-grain strengthening remains a critical challenge in dilute Mg alloys, as high-temperature solid-solution, utilized to impart high-level solutes for strain-aging, inevitably causes grain coarsening and great strength loss. Herein, we report a rapid dislocation-mediated solute repartitioning behavior upon aging in a low-temperature annealed Mg–1.0Zn–0.45Ca–0.33Sn–0.2Mn (wt.%) alloy. Thereby, appreciable strain-aging hardening (YS increment of ∼30 MPa) coupling with fine-grain (grain size of ∼2.5 µm) strengthening accounts for a high yield strength (∼297 MPa) and ductility (∼20%). It suggests a feasible avenue to develop strong dilute Mg alloys by combining strain-aging hardening and fine-grain strengthening.
Original language | English |
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Pages (from-to) | 21-28 |
Number of pages | 8 |
Journal | Materials Research Letters |
Volume | 10 |
Issue number | 1 |
DOIs | |
State | Published - 2022 |
Externally published | Yes |
Keywords
- aging
- dislocation
- Magnesium alloys
- solute segregation
- strength