Stress corrosion cracking of Al7075 alloy processed by equal channel angular pressing
Stress corrosion cracking of Al7075 alloy processed by equal channel angular pressing
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发表时间：
2010
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通讯作者：
S. R. Kumar;K. Gudimetla;P. Venkatachalam;B. Ravisankar
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作者：
S. R. Kumar;K. Gudimetla;P. Venkatachalam;B. Ravisankar
研究了Al-7075退火合金在等径角挤压（ECAP）前后的应力腐蚀开裂（SCC）行为。采用慢应变速率试验（SSRT）对Al-7075合金在ECAP前后的SCC行为进行了评价。比较了uneced和eced样品的拉伸和SCC行为。退火al7075经SCC处理后，其伸长率和极限抗拉强度分别降低了1.25倍和1.1倍。经ECAP后，伸长率下降约1.6倍，UTS下降约1.09倍。与UTS相比，延展性的下降幅度更大。断口分析（来自3.5% NaCl溶液中的SSRT试验）显示，ECAP前以韧性破坏为主，ECAP后以混合（准解理）破坏模式为主。虽然由于ECAP， SCC电阻降低，但这似乎是一个积极的迹象，表明可以通过修改工艺参数和样品条件来改善SCC。
The aim of the present work was to evaluate the stress corrosion cracking (SCC) behavior of the annealed Al-7075 alloy before and after Equal Channel Angular Pressing (ECAP). The SCC behavior of the Al-7075 alloy before and after ECAP was evaluated using slow strain rate testing (SSRT). Tensile and SCC behavior of the UNECAPed and ECAPed samples were compared. The elongation and ultimate tensile strength (UTS) was decreases 1.25, 1.1 times respectively after SCC in the annealed Al 7075. After ECAP, about 1.6 times decreases in elongation and 1.09 times decrease in UTS is observed. The decrease in ductility is more as compared to UTS. The fracture surface analysis (from the SSRT tests in 3.5% NaCl solution) revealed predominant ductile failure in the before ECAP and mixed (quasi cleavage) mode of failure was observed after ECAP. Though the SCC resistance decreases due to ECAP, this appears a positive sign that the SCC may be improved by modifying process parameters and the condition of the sample.