首页|Synergistic enhancement on mechanical properties and corrosion resistance of biodegradable Mg-Zn-Y alloy via V-microalloying
Synergistic enhancement on mechanical properties and corrosion resistance of biodegradable Mg-Zn-Y alloy via V-microalloying
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维普
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For the sake of improving the mechanical properties and corrosion resistance of biodegradable Mg alloy synergistically,various content of el-ement V(0％,0.05％,0.10％,0.15％,0.20％,in mass fraction)are introduced into an Mg-Zn-Y alloy with long-period stacking ordered(LP-SO)structure,and the effects of V on its microstructure,mechanical properties and corrosion resistance are investigated systematically.The re-sults 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 sec-ond 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 modifica-tion of second phase,the tensile strength and strain of alloys are both enhanced effectively.Especially,the ultimate tensile strength and the elon-gation 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 continu-ously 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 mm·a-1 and 6.2 mm·a-1,respectively,which are 42.6％and 45.4％lower than those of V-free alloy.
维普
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