Abstract
In this study, a heterogeneous lamellar structure is achieved in Mg97Y2Zn1 alloy via large-ratio hot extrusion of the alloys in as-cast (CE) and as-annealed (AE) stages. The ultimate tensile strength (UTS) of CE and AE alloys is 426.5 and 471.4 MPa, and their fracture elongation (FE) is 8.1% and 1.0%, respectively. Mechanical properties of the CE and AE alloys exceed that of the majority of wrought Mg97Y2Zn1 alloys due to the heterostructure induced strengthening. Both in the two extruded alloys, α-Mg layers and LPSO layers acting as soft and hard domains, respectively, constitute the heterogeneous lamellar structure. As a result of the narrower spacing of α-Mg and LPSO layers, more refined DRX grains and LPSO particles, and the increased volume fraction of LPSO phase, the strength of the AE alloy is higher than that of CE alloy. However, the AE alloy exhibits poor ductility owing to the easy aggregation of dislocations and stress at the interfaces of narrower layers. Based on discussion of the strengthening mechanisms, the preparation of Mg97Y2Zn1 alloys with tailored mechanical properties of high UTS ranging from 420 to 480 MPa, and FE 1~ 8%, could be realized via the combination of annealing (controlling the content of 14H phase) and large-ratio hot extrusion (promoting the formation of heterogeneous lamellar structure).
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