【摘 要】
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In this study,the microstructure,mechanical properties and corrosion behaviors of a Zn-1.6Mg (wt％) alloy during multipass rotary die equal channel angle pressing
【机 构】
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College of Mechanics and Materials, Hohai University,Nanjing 210000, China;Ocean and Coastal Enginee
论文部分内容阅读
In this study,the microstructure,mechanical properties and corrosion behaviors of a Zn-1.6Mg (wt％) alloy during multipass rotary die equal channel angle pressing (RD-ECAP) processing at 150 ℃ were systematically investigated.The results indicated that a Zn + Mg2Zn11 + MgZn2 ternary eutectic structure was formed in as-cast Zn-Mg alloy.After ECAP,the primary Zn matrix turned to fine dynamic recrystallization (DRX) grains,and the network-shaped eutectic structure was crushed into fine particles and blended with DRX grains.Owing to the refined microstructure,dispersed eutectic structure and dynamically precipitated precipitates,the 8p-ECAP alloy possessed the optimal mechanical properties with ultimate tensile strength of 474 MPa and elongation of 7％.Moreover,the electrochemical results showed that the ECAP alloys exhibited similar corrosion rates with that of as-cast alloys in simulated body fluid,which suggests that a high-strength Zn-Mg alloy was successfully developed without sacrifice of the corrosion resistance.
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