Stress corrosion characteristics of AL-Li-X alloys: role of GB precipitate size and spacing

A.K.Vasudevan; K.Sadananda; ThodlaRamgopal

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Stress corrosion characteristics of AL-Li-X alloys: role of GB precipitate size and spacing

机译：Al-Li-X合金的应力腐蚀特性：GB沉淀尺寸和间距的作用

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Stress corrosion characteristics of three alloys, AL-3Li, AL-2Li-3Cu, and 5083, were analyzed. All three alloys have anodic grain boundary (GB) precipitates (ppts) (δ, T1, and β, respectively) that show different corrosion rates with respect to the lattice H diffusion. These GB phases grow with heat treatment time. These phases affect room-temperature fracture toughness in AL-3Li and AL-2Li-3Cu alloys but not in 5083 alloy. When exposed to NaCl solution, all three GB phases dissolve. Under an applied stress, the resulting stress corrosion threshold stress intensity K1scc varies inversely with size and spacing, when the local crack tip environmental condition is established. The mechanism involved is mostly anodic dissolution with a secondary effect from hydrogen.

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来源
《Corrosion Reviews》 |2017年第5期|共18页
作者
A.K.Vasudevan; K.Sadananda; ThodlaRamgopal;
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作者单位

Technical Data Analysis Inc. 3190 Fairview Park Falls Church VA 22043 USA;

Technical Data Analysis Inc. 3190 Fairview Park Falls Church VA 22043 USA;

DNV GL Materials Technology Development Dublin OH USA;

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原文格式 PDF
正文语种 eng
中图分类金属腐蚀与保护、金属表面处理;
关键词
anodic precipitates; crack initiation threshold; dissolution; hydrogen; size/spacing of grain boundary phases;

机译：阳极沉淀;裂纹启动阈值;溶解;氢;晶界阶段的尺寸/间距;

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Stress corrosion characteristics of AL-Li-X alloys: role of GB precipitate size and spacing

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