Effect of aging treatment on mechanical properties of an age-hardenable aluminum alloy after equal channel angular pressing at room temperature has been investigated using hardness, stress–strain behavior and surface fractography. Aluminum alloy 7075 was pressed after solution treatment. Yield stress, ultimate stress and hardness of pressed samples have increased significantly compared with those of coarse grain, but the elongation to failure has decreased. Also the pressed specimens were subjected to aging treatment at room temperature and temperatures of 80 °C, 100 °C, 120 °C and 140 °C to obtain the optimized strength and ductility. The results indicated that post–equal channel angular pressing aging at 80 °C has resulted in the maximum strength, and natural aging has resulted in good ductility and acceptable strength. It confirmed the fact that there is a potential in obtaining high strength and good ductility in age-hardenable alloys employing severe plastic deformation and subsequent aging.
ValievRZLangdonTG. Principles of equal-channel angular pressing as a processing tool for grain refinement. Prog Mater Sci2006; 51: 881–981.
2.
TerhuneSDSwisherDLOh-IshiKet al. An investigation of microstructure and grain-boundary evolution during ECA pressing of pure aluminum. Metall Mater Trans A2002; 33: 2173–2184.
3.
YanagidaAJokoKAzushimaA. Formability of steels subjected to cold ECAE process. J Mater Process Tech2008; 201: 390–394.
4.
DjavanroodiFSedighiMHashemiPet al. Equal channel angular pressing of copper wire. Proc IMechE, Part B: J Engineering Manufacture2014; 228: 1273–1279.
5.
TranTL. Equal channel angular pressing (ECAP) process of copper electrodes for resistance spot brazing application. MSc Thesis, Universiti Sains Malaysia, Penang, Malaysia, 2007.
6.
MorrisDGMunoz-MorrisMA. Microstructure of severely deformed Al–3Mg and its evolution during annealing. Acta Mater2002; 50: 4047–4060.
7.
Bayat AslYMeratianMEmamikhahMet al. Mechanical properties and machinability of 6061 aluminum alloy produced by equal-channel angular pressing. Proc IMechE, Part B: J Engineering Manufacture. Epub ahead of print 24 June 2014. DOI: 10.1177/0954405414535921.
8.
HoritaZFujinamiTNemotoMet al. Improvement of mechanical properties for Al alloys using equal-channel angular pressing. J Mater Process Tech2001; 117: 288–299.
9.
SmithWF. Structure and properties of engineering alloys. New York: McGraw-Hill, 1993, 214 pp.
10.
ChinhNQGubiczaJCzeppeTet al. Developing a strategy for the processing of age-hardenable alloys by ECAP at room temperature. Mat Sci Eng A: Struct2009; 516: 248–252.
11.
Cepeda-JimenezCMGarcia-InfantaJMZhilyaevAPet al. Mechanical properties at room temperature of an Al–Zn–Mg–Cu alloy processed by equal channel angular pressing. J Alloy Compd2011; 509: 636–643.
12.
KimWJKimJKKimHKet al. Effect of post equal-channel-angular-pressing aging on the modified 7075 Al alloy containing Sc. J Alloy Compd2008; 450: 222–228.
13.
ZhengLJLiHXHashmiMFet al. Evolution of microstructure and strengthening of 7050 Al alloy by ECAP combined with heat-treatment. J Mater Process Tech2006; 171: 100–107.
14.
ZhaoXFuWYangXet al. Microstructure and properties of pure titanium processed by equal-channel angular pressing at room temperature. Scripta Mater2008; 59: 542–545.
15.
ZhengLJChenCQZhouTTet al. Structure and properties of ultrafine-grained Al-Zn-Mg-Cu and Al-Cu-Mg-Mn alloys fabricated by ECA pressing combined with thermal treatment. Mater Charact2003; 49: 455–461.
16.
ZhaoYHLiaoXZJinZet al. Microstructures and mechanical properties of ultrafine grained 7075 Al alloy processed by ECAP and their evolutions during annealing. Acta Mater2004; 52: 4589–4599.
17.
KochCC. Optimization of strength and ductility in nanocrystalline and ultrafine grained materials. Scripta Mater2003; 49: 657–662.
18.
ValievRZIslamgalievRKAlexadrovIV. Bulk nanostructured materials from severe plastic deformation. Prog Mater Sci2000; 45: 103–189.
19.
DaoMLuLAsaroRJet al. Toward a quantitative understanding of mechanical behavior of nanocrystalline metals. Acta Mater2007; 55: 4041–4065.
20.
KimWJChungCSMaDSet al. Optimization of strength and ductility of 2024 Al by equal channel angular pressing (ECAP) and post-ECAP aging. Scripta Mater2003; 49: 333–338.
21.
ZhaoYHLiaoXZChengSet al. Simultaneously increasing the ductility and strength of nanostructured alloys. Adv Mater2006; 18: 2280–2283.
22.
PanigrahiSKJayaganthanR. Effect of ageing on microstructure and mechanical properties of bulk, cryorolled, and room temperature rolled Al 7075 alloy. J Alloy Compd2011; 509: 9609–9616.
23.
IwahashiYWangJHoritaZet al. Principle of equal channel angular pressing for the processing of UFG materials. Scripta Mater1996; 35: 143–146.
24.
RoshanMRJenabali JahromiSAEbrahimiR. Predicting the critical pre-aging time in ECAP processing of age-hardenable aluminum alloys. J Alloy Compd2011; 509: 7833–7839.
25.
GubiczaJSchillerIChinhNQet al. The effect of severe plastic deformation on precipitation in supersaturated Al–Zn–Mg alloys. Mat Sci Eng A: Struct2007; 460–461: 77–85.
26.
ChinhNQGubiczaJCzeppeTet al. Processing age-hardenable alloys by equal-channel angular pressing at room temperature: strategies and advantages. Mater Sci Forum2010; 633–634: 527–534.
27.
KumaraSRGudimetlaKVenkatachalamPet al. Microstructural and mechanical properties of Al 7075 alloy processed by equal channel angular pressing. Mat Sci Eng A: Struct2012; 533: 50–54.
28.
YoungGJHyunMBSunKHet al. Continuous high strength aluminum bolt manufacturing by the spring-loaded ECAP system. J Mater Process Tech2012; 212: 848–855.
29.
HoritaZOhashiKFujitaTet al. Achieving high strength and high ductility in precipitation hardened alloys. Adv Mater2005; 17: 1599–1602.
