Flow stress behavior of high-purity Al-Cu-Mg alloy and microstructure evolution

Abstract

The flow stress behavior of high-purity Al-Cu-Mg alloy under hot deformation conditions was studied by Gleeble-1500, with the deformation temperature range from 300 to 500 °C and the strain rate range from 0.01 to 10 s⁻¹. From the true stress-true strain curve, the flow stress increases with the increasing of strain and tends to be constant after a peak value, showing dynamic recover, and the peak value of flow stress increases with the decreasing of deformation temperature and the increasing of strain rate. When the strain rate is 10 s⁻¹ and the deformation temperature is higher than 400 °C, the flow stress shows dynamic recrystallization characteristic. TEM micrographs were used to reveal the evolution of microstructures. According to the processing map at true strain of 0.7, the feasible deformation conditions are high strain rate (>0.5 s⁻¹) or 440–500 °C and 0.01–0.02 s⁻¹.

Keywords

high-purity Al-Cu-Mg alloy / hot compression / flow stress / processing map

References

[1] XiaoY-qingAluminum processing technology practical manual [M], 2005, Beijing, Metallurgical Industry Press: 127

[2] LequeuP H, LassinceP H, WarnerT. Aluminum alloy development for the airbus A380-Part 2 [J]. Advanced Materials and Processes, 2007, 156(7): 41-44

[3] HeinzA, HaszlerA, KeidelC, MoldenhauerS, BenedictusR, MillerW S. Recent development in aluminum alloys for aerospace applications [J]. Materials Science and Engineering A, 2000, 280(1): 102-107

[4] Jabbari TaleghanM A, Ruiz NavasE M, SalehiM, TorralbaJ M. Hot deformation behaviour and flow stress prediction of 7075 aluminium alloy powder compacts during compression at elevated temperatures [J]. Materials Science and Engineering A, 2012, 534(1): 624-631

[5] WangH-b, WanM, YanYu. Effect of flow stress-strain relation on forming limit of 5754O aluminum alloy [J]. Transactions of Nonferrous Metals Society of China, 2012, 22(10): 2370-2378

[6] Rezaei AshtianiH R, ParsaM H, BisadiH. Constitutive equations for elevated temperature flow behavior of commercial purity aluminum [J]. Materials Science and Engineering A, 2012, 545(30): 61-67

[7] WuB, LiM Q, MaD W. The flow behavior and constitutive equations in isothermal compression of 7050 aluminum alloy [J]. Materials Science and Engineering A, 2012, 542(30): 79-87

[8] HuangX-d, YangH, ZhangH, LiL-xing. Flow behavior of 2026 aluminum alloy during hot compression deformation [J]. Hot Working Technology, 2009, 38(14): 20-24

[9] ZhaoY L, YangZ Q, ZhangZ, SuG Y, MaX L. Double-peak age strengthening of cold-worked 2024 aluminum alloy [J]. Acta Materialia, 2013, 61(5): 1624-1638

[10] Muthu KumaranS. Identification of high temperature precipitation reactions in 2024 Al-Cu-Mg alloy through ultrasonic parameters [J]. Journal of Alloys and Compounds, 2012, 539(25): 179-183

[11] LinY C, XiaY-c, JiangY-q, ZhouH-m, LiL-ting. Precipitation hardening of 2024-T3 aluminum alloy during creep aging [J]. Materials Science and Engineering A, 2013, 565(10): 420-429

[12] WangS C, StarinkM J. Two types of S phase precipitates in Al-Cu-Mg alloys [J]. Acta Materialia, 2007, 55: 933-941

[13] LiY, LiuZ-y, BaiS, ZhouX-w, WangH, ZengS-min. Enhanced mechanical properties in an Al-Cu-Mg-Ag alloy by duplex aging [J]. Materials Science and Engineering A, 2011, 528(28): 8060-8064

[14] QuanL-w, ZhaoG, GaoS, MuddleB C. Effect of pre-stretching on microstructure of aged 2524 aluminium alloy [J]. Transactions of Nonferrous Metals Society of China, 2011, 21(9): 1957-1962

[15] CharlesK S, MoyC K S, WeissM, XiaJ-h, ShaG, RingerS P, RanziG. Influence of heat treatment on the microstructure, texture and formability of 2024 aluminium alloy [J]. Materials Science and Engineering A, 2012, 552(30): 48-60

[16] PrasadY V R K, GegelH L, DoraiveluS M, MalasJ C, MorganJ T, LarkK A, BarkerD R. Modeling of dynamic material behavior in hot deformation: forging of Ti-6242 [J]. Metallurgical Transactions A, 1984, 19(10): 1883-1892

[17] PrasadY V R K, SasidharaSHot working guide: A compendium of processing maps [M], 1997, Ohio, ASM International, Materials Park: 26-198

[18] BozziniB, CerriE. Numerical reliability of hot working processing maps [J]. Materials Science and Engineering A, 2002, 328(1/2): 344-347

[19] Narayana-MurityS V S, Nageswara-RaoB. On the development of instability criteria during hotworking with reference to IN718 [J]. Materials Science and Engineering A, 1998, 254(1/2): 76-82

[20] JuQ, LiD-g, LiuG-quan. Processing map of hot plastic deformation of a 15Cr-25Ni-Fe base superalloy [J]. Acta Metallurgica Sinica, 2006, 42(2): 218-224