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Influence of trace As content on the microstructure and corrosion behavior of the AZ91 alloy in different metallurgical conditions
Influence of trace As content on the microstructure and corrosion behavior of the AZ91 alloy in different metallurgical conditions
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摘要：
The influence of trace As content(0.04,0.05,0.06 wt%)on the microstructure and corrosion behavior of AZ91 alloy in different metallurgical conditions(as-cast,as-quenched,peak-aged)was firstly investigated.It is found that the corrosion resistance of AZ91 alloy in all conditions is significantly enhanced by As addition,mainly due to cathodic toxication,melt purification and incidence reduction of local corrosion.As alloying leads to the formation of Mg 3 As 2 and makes the β-Mg 17 Al 12 phase less continuous in the as-cast alloys.The alloy containing 0.06 wt%As obtains a higher corrosion rate than those of the alloy containing 0.05 wt%As owing to a more discontinuity of β phase.The β phase is dissolved into the matrix in the as-quenched alloys and reprecipitates along the grain boundaries after aging.The more continuous β phase distribution in the peak-aged alloys contributes to corrosion resistance.The corrosion rates are in the order of as-quenched>as-cast>peak-aged.The lowest corrosion rate(0.67 mm/y)in 3.5 wt%NaCl solution is obtained in the peak-aged AZ91-0.05As alloy,which is over 70%lower than that of as-cast AZ91 alloy(2.22 mm/y).
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研究主题发展历程
节点文献
Magnesium
alloy
AZ91
MICROSTRUCTURE
Corrosion
behavior
研究起点
研究来源
研究分支
研究去脉
引文网络交叉学科
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镁合金学报（英文）
主办单位：
China
Association
for
Science
and
Technology
Chinese
Committee
for
Magnesium
and
its
Applications
出版周期：
季刊
ISSN：
2213-9567
CN：
50-1220/TF
开本：
出版地：
174 Shazheng Str., C
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出版文献量（篇）
153
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1
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0
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