微束等离子体重熔Mg-12Dy-1.1Ni合金的显微组织和腐蚀性能

Microstructure and corrosion properties of micro-beam plasma remelted Mg-12Dy-1.1Ni alloy

姜静 ¹陈思琦 ¹顾家睿 ¹毕广利 ¹黄健康 ¹李元东 ¹陈体军 ¹马颖¹

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作者信息

1. State Key Laboratory of Advanced Processing and Recycling of Nonferrous Metals(Lanzhou University of Technology),Lanzhou 730050,China;School of Material Science and Engineering,Lanzhou University of Technology,Lanzhou 730050,China
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摘要

本文研究了微束等离子体重熔(MPRMed)Mg-12Dy-1.1Ni(wt％)合金的显微组织和腐蚀性能.铸态合金主要由α-Mg相、具有18R-LPSO结构的片层状Mg12DyNi相和Mg24Dy5相组成.经微束等离子体重熔后,铸态合金的晶粒尺寸显著细化至11μm,18R-LPSO相体积分数由18.3％增加至26.0％,并呈连续网状分布.电化学和浸泡实验结果表明,在0.1 mol/L NaCl溶液中,MPRMed合金的失重速率(0.31 g/(cm2·d))和腐蚀电流密度(605.3μA/cm2)均低于铸态合金,其中腐蚀电流密度较铸态合金减少了38.5％.该MPRMed合金优异的耐腐蚀性能主要源自于其均匀的显微组织、致密的腐蚀产物和连续分布的18R-LPSO相.

Abstract

Microstructure and corrosion properties of micro-beam plasma remelted (MPRMed) Mg-12Dy-1.1Ni (wt％) alloy were investigated. The as-cast alloy was mainly composed of α-Mg, lamellar Mg12DyNi phase with a 18R-long period stacking order (LPSO) structure, and Mg24Dy5 phase. After micro-beam plasma remelting (MPR), the grain size of the as-cast alloy was remarkably refined to 11 μm, and the amounts of 18R-LPSO phase increased from 18.3％ to 26.0％ and distributed as continuous network. The electrochemical and immersion tests indicated that the MPRMed alloy exhibited a lower mass loss rate 0.31 g/(cm2·d) and corrosion current density (605.3 μA/cm2, and ～38.5％ reduction after MPR) than the as-cast alloy in 0.1 mol/L NaCl solution. The improved corrosion resistance of the MPRMed alloy was primarily ascribed to the uniform microstructure, denser corrosion products and continuous distribution of 18R-LPSO phase.

关键词

Mg-Dy-Ni合金/微束等离子重熔/显微组织/LPSO相/腐蚀性能

Key words

Mg-Dy-Ni alloy/micro-beam plasma remelting/microstructure/LPSO phase/corrosion properties

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基金项目

National Natural Science Foundation of China(52001152)

National Natural Science Foundation of China(51961021)

Undergraduate Innovation and Entrepreneurship Training Programs,China(DC2020353)

Undergraduate Innovation and Entrepreneurship Training Programs,China(DC2020342)

Undergraduate Innovation and Entrepreneurship Training Programs,China(DC2022017)

Undergraduate Innovation and Entrepreneurship Training Programs,China(DC2022025)

Undergraduate Innovation and Entrepreneurship Training Programs,China(DC2022027)

出版年

2023

中南大学学报(英文版)

中南大学

中南大学学报(英文版)

CSTPCDCSCD北大核心EI

影响因子：0.47

ISSN：2095-2899

参考文献量7

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