STRESS CORROSION CRACKING OF AN AL-ZN-MG-CU ALLOY AFTER DIFFERENT PRECIPITATION HARDENING TREATMENTS
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Stress corrosion cracking (SCC) was tested in a high strength 7000 series aluminium alloy applied for
weapons and military equipment. The effect of one step- and two-step precipitation hardening (aging) on SCC was
investigated. The slow strain rate test (SSRT) and the fracture mechanics (FM) method were used for SCC testing. The
measurements of electrical resistivity allowed evaluating an aging degree in the tested alloy. Both testing methods have
shown that the alloy after two-step precipitation hardening is significantly more resistant to SCC. The critical stress
intensity factor for SCC, KISCC is significantly higher, and the crack growth rate on the plateau, vpl is more than one
order of magnitude lower for the alloy in this state. Processes that take place at the crack tip are proposed and the
effect of copper was analyzed. The effect of the testing solution (NaCl) temperature on the vpl was determined. Two
values of the apparent activation energy, Ea, were obtained; one v...alue (46.6 kJ mol-1) refers to higher temperatures,
while the other (70.4 kJ mol-1) refers to lower test temperatures. These values of Ea correspond to the different
processes that control the vpl, at higher and lower temperatures.
Ključne reči:
aluminium alloys / stress corrosion cracking / fracture mechanics / slow strain rate testIzvor:
5th International Scientific Conference on Defensive Technologies, 2012, 582-587Izdavač:
- Military Technical Institute
Finansiranje / projekti:
- Istraživanje i optimizacija tehnoloških i funkcionalnih performansi ventilacionog mlina termoelektrane Kostolac B (RS-MESTD-Technological Development (TD or TR)-34028)
- Sinteza, razvoj tehnologija dobijanja i primena nanostrukturnih multifunkcionalnih materijala definisanih svojstava (RS-MESTD-Integrated and Interdisciplinary Research (IIR or III)-45019)
Institucija/grupa
Inovacioni centarTY - CONF AU - Alil, Ana AU - Jegdić, Bore V. AU - Bobić, Biljana AU - Radosavljević, Miroslav AU - Katavić, Boris PY - 2012 UR - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/6093 AB - Stress corrosion cracking (SCC) was tested in a high strength 7000 series aluminium alloy applied for weapons and military equipment. The effect of one step- and two-step precipitation hardening (aging) on SCC was investigated. The slow strain rate test (SSRT) and the fracture mechanics (FM) method were used for SCC testing. The measurements of electrical resistivity allowed evaluating an aging degree in the tested alloy. Both testing methods have shown that the alloy after two-step precipitation hardening is significantly more resistant to SCC. The critical stress intensity factor for SCC, KISCC is significantly higher, and the crack growth rate on the plateau, vpl is more than one order of magnitude lower for the alloy in this state. Processes that take place at the crack tip are proposed and the effect of copper was analyzed. The effect of the testing solution (NaCl) temperature on the vpl was determined. Two values of the apparent activation energy, Ea, were obtained; one value (46.6 kJ mol-1) refers to higher temperatures, while the other (70.4 kJ mol-1) refers to lower test temperatures. These values of Ea correspond to the different processes that control the vpl, at higher and lower temperatures. PB - Military Technical Institute C3 - 5th International Scientific Conference on Defensive Technologies T1 - STRESS CORROSION CRACKING OF AN AL-ZN-MG-CU ALLOY AFTER DIFFERENT PRECIPITATION HARDENING TREATMENTS EP - 587 SP - 582 UR - https://hdl.handle.net/21.15107/rcub_technorep_6093 ER -
@conference{ author = "Alil, Ana and Jegdić, Bore V. and Bobić, Biljana and Radosavljević, Miroslav and Katavić, Boris", year = "2012", abstract = "Stress corrosion cracking (SCC) was tested in a high strength 7000 series aluminium alloy applied for weapons and military equipment. The effect of one step- and two-step precipitation hardening (aging) on SCC was investigated. The slow strain rate test (SSRT) and the fracture mechanics (FM) method were used for SCC testing. The measurements of electrical resistivity allowed evaluating an aging degree in the tested alloy. Both testing methods have shown that the alloy after two-step precipitation hardening is significantly more resistant to SCC. The critical stress intensity factor for SCC, KISCC is significantly higher, and the crack growth rate on the plateau, vpl is more than one order of magnitude lower for the alloy in this state. Processes that take place at the crack tip are proposed and the effect of copper was analyzed. The effect of the testing solution (NaCl) temperature on the vpl was determined. Two values of the apparent activation energy, Ea, were obtained; one value (46.6 kJ mol-1) refers to higher temperatures, while the other (70.4 kJ mol-1) refers to lower test temperatures. These values of Ea correspond to the different processes that control the vpl, at higher and lower temperatures.", publisher = "Military Technical Institute", journal = "5th International Scientific Conference on Defensive Technologies", title = "STRESS CORROSION CRACKING OF AN AL-ZN-MG-CU ALLOY AFTER DIFFERENT PRECIPITATION HARDENING TREATMENTS", pages = "587-582", url = "https://hdl.handle.net/21.15107/rcub_technorep_6093" }
Alil, A., Jegdić, B. V., Bobić, B., Radosavljević, M.,& Katavić, B.. (2012). STRESS CORROSION CRACKING OF AN AL-ZN-MG-CU ALLOY AFTER DIFFERENT PRECIPITATION HARDENING TREATMENTS. in 5th International Scientific Conference on Defensive Technologies Military Technical Institute., 582-587. https://hdl.handle.net/21.15107/rcub_technorep_6093
Alil A, Jegdić BV, Bobić B, Radosavljević M, Katavić B. STRESS CORROSION CRACKING OF AN AL-ZN-MG-CU ALLOY AFTER DIFFERENT PRECIPITATION HARDENING TREATMENTS. in 5th International Scientific Conference on Defensive Technologies. 2012;:582-587. https://hdl.handle.net/21.15107/rcub_technorep_6093 .
Alil, Ana, Jegdić, Bore V., Bobić, Biljana, Radosavljević, Miroslav, Katavić, Boris, "STRESS CORROSION CRACKING OF AN AL-ZN-MG-CU ALLOY AFTER DIFFERENT PRECIPITATION HARDENING TREATMENTS" in 5th International Scientific Conference on Defensive Technologies (2012):582-587, https://hdl.handle.net/21.15107/rcub_technorep_6093 .