Mitigating Intergranular Stress Corrosion Cracking in Age-Hardenable Al-Zn-Mg-Cu Alloys
Mitigating Intergranular Stress Corrosion Cracking in Age-Hardenable Al-Zn-Mg-Cu Alloys
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DOI：
10.1007/s11661-018-4601-8
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发表时间：
2018-04
期刊：
影响因子：
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通讯作者：
M. Ajay Krishnan;V. S. Raja;Shweta Shukla;S. M. Vaidya
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文献类型：
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作者：
M. Ajay Krishnan;V. S. Raja;Shweta Shukla;S. M. Vaidya
本文报道了研制抗晶间应力腐蚀开裂（SCC）的7 xxx系列高强度铝合金的尝试。在这项工作中报告的一种新的时效技术表现出改善的强度水平（高达约100 MPa的AA 7050的传统过时效回火），即使在3.5重量百分比的氯化钠在低应变速率（10 - 7s-1）测量显着的耐应力腐蚀开裂。新的时效热处理产生的微观结构，是更精细和致密的足够的矩阵赋予强度，而它是富含Cu的晶界赋予耐SCC性。对增强的强度和抗SCC性能进行了详细的解释。
This article reports an attempt to develop high-strength aluminum alloys of 7xxx series resistant to intergranular stress corrosion cracking (SCC). A novel aging technique reported in this work exhibited improved strength levels (as high as ~ 100 MPa to that of conventional overaged temper for AA 7050) with significant resistance to SCC measured even at a low strain rate (10−7s−1) in 3.5 wt pct NaCl. The novel aging heat treatment produced a microstructure that is finer and dense enough in the matrix to impart strength, whereas it is enriched with Cu on the grain boundaries to impart SCC resistance. A detailed explanation for the enhanced strength and SCC resistance is discussed.