在线提供 19 October 2023
For the sake of improving the mechanical properties and corrosion resistance of biodegradable Mg alloy synergistically, various content of element V (0, 0.05, 0.10, 0.15,
0.20 wt.%) are introduced into an Mg-Zn-Y alloy with long-period
stacking ordered (LPSO) structure, and the effects of V on its
microstructure, mechanical properties and corrosion resistance are
investigated systematically. The results indicate that the grains are
effectively refined by V addition, and the primary α-Mg in Mg-Zn-Y-V0.1
alloy is most significantly refined, with grain size being decreased by
62%. The amount of 18R LPSO structure is increased owing to the V
addition. The growth mode of the second phase (W-phase and 18R LPSO
structure) is transformed to divorced growth pattern, which ascribes to
the thermodynamic drive force of V to promote the nucleation of LPSO
phase. Thus, 18R LPSO structure presents a continuous distribution. Due
to grains refinement and modification of second phase, the tensile strength and strain of alloys are both enhanced effectively. Especially, the
ultimate tensile strength and the elongation of V0.1 alloy are 254 MPa
and 15.26%, which are 41% and 61% higher than those of V-free alloy,
respectively. Owing to the continuously distributed 18R LPSO structure
with refined grains and stable product film, the weight loss and hydrogen evolution corrosion rates of V0.1 alloy are 7.1 and 6.2 mmy−1, respectively, which are 42.6% and 45.4% lower than those of V-free alloy.