Al–Mg–Mn alloy AA5083 has been processed by equal channel angular extrusion (ECAE) followed by hot and cold rolling. The grain structure, crystallographic texture, intermetallic phases and superplasticity were investigated and compared with a conventionally hot and cold rolled AA5083 sheet. The intensive shear strain in ECAE has a very strong breakdown effect on the dendritic cast structure, which effectively changes the volume fraction and size of the intermetallic particles that provide particle stimulated nucleation upon recrystallisation. Consequently, the combination of ECAE and rolling leads to a finer and more thermally stable grain structure, with fewer very coarse constituent particles, resulting in a significant improvement in superplasticity through enhanced grain boundary sliding, with retarded formation and linkage of cavities.
VetranoJS, LavenderCA, HamiltonCH, Superplastic behavior in a commercial 5083 aluminum alloy. Scr Metal Mater. 1994;30:565–570. doi: 10.1016/0956-716X(94)90430-8
2.
TakayamaY, SasakiS, TozawaT, Superplasticity and fractography over wide ranges of temperature and strain rate in a 5083 aluminum alloy. J Jpn Inst Light Met. 1999;49:378–382. doi: 10.2464/jilm.49.378
3.
BaeDH, GhoshAK. Grain size and temperature dependence of superplastic deformation in an Al-Mg alloy under isostructural condition. Acta Mater. 2000;48:1207–1224. doi: 10.1016/S1359-6454(99)00445-0
4.
ClevelandRM, GhoshAK, BradleyJR. Comparison of superplastic behavior in two 5083 aluminum alloys. Metall Mater Trans A. 2003;34:228–236.
5.
KulasM-A, GreenWP, TaleffEM, Deformation mechanisms in superplastic AA5083 materials. Metall Mater Trans A. 2005;36:1249–1261. doi: 10.1007/s11661-005-0217-x
6.
HeftiLD. Commercial airplane applications of superplastically formed AA5083 aluminum sheet. J Mater Eng Perform. 2007;16:136–141. doi: 10.1007/s11665-007-9023-5
7.
IwahashiY, HoritaZ, NemotoM, The process of grain refinement in equal-channel angular pressing. Acta Mater. 1998;46:3317–3331. doi: 10.1016/S1359-6454(97)00494-1
8.
DupuyL, BlandinJJ, RauchEF. Structural and mechanical properties in AA 5083 processed by ECAE. Mater Sci Technol. 2000;16:1256–1258. doi: 10.1179/026708300101507424
9.
HuarteB, LuisCJ, LuriR, A study on the heat treatments of deformed AA5083 by the ECAE process. Int J Comp Mater Sci Surf Eng. 2009;2:128–136.
10.
FakharN, Fereshteh-SanieeF, MahmudiR. High strain-rate superplasticity of fine- and ultrafine-grained AA5083 aluminum alloy at intermediate temperatures. Mater Des. 2015;85:342–348. doi: 10.1016/j.matdes.2015.06.158
11.
StolyarovVV, ZhuYT, LoweTC, A two-step SPD processing of ultrafine-grained titanium. Nanostruct Mater. 1999;11:947–954. doi: 10.1016/S0965-9773(99)00384-0
12.
SakaiG, HoritaZ, LangdonTG. Grain refinement and superplasticity in an aluminum alloy processed by high-pressure torsion. Mater Sci Eng A. 2005;393:344–351. doi: 10.1016/j.msea.2004.11.007
13.
ItoY, HoritaZ. Microstructural evolution in pure aluminum processed by high-pressure torsion. Mater Sci Eng A. 2009;503:32–36. doi: 10.1016/j.msea.2008.03.055
14.
SaitoY, TsujiN, UtsunomiyaH, Ultra-fine grained bulk aluminum produced by accumulative roll-bonding (ARB) process. Scr Mater. 1998;39:1221–1227. doi: 10.1016/S1359-6462(98)00302-9
15.
SheikhH. Role of shear banding on the microtexture of an Al-Mg alloy processed by hot/high strain rate accumulative roll bonding. Scr Mater. 2011;64:556–559. doi: 10.1016/j.scriptamat.2010.11.041
16.
ToroghinejadMR, AshrafizadehF, JamaatiR. On the use of accumulative roll bonding process to develop nanostructured aluminum alloy 5083. Mater Sci Eng A. 2013;561:145–151. doi: 10.1016/j.msea.2012.11.010
17.
MishraRS, MaZY. Friction stir welding and processing. Mater Sci Eng R. 2005;50:1–78. doi: 10.1016/j.mser.2005.07.001
18.
JohannesLB, CharitI, MishraRS, Enhanced superplasticity through friction stir processing in continuous cast AA5083 aluminum. Mater Sci Eng A. 2007;464:351–357. doi: 10.1016/j.msea.2007.02.012
19.
García-BernalMA, MishraRS, VermaR, High strain rate superplasticity in continuous cast Al-Mg alloys prepared via friction stir processing. Scr Mater. 2009;60:850–853. doi: 10.1016/j.scriptamat.2009.01.030
20.
AkamatsuH, FujinamiT, HoritaZ, Influence of rolling on the superplastic behavior of an Al-Mg-Sc alloy after ECAP. Scr Mater. 2001;44:759–764. doi: 10.1016/S1359-6462(00)00666-7
21.
ParkKT, LeeHJ, LeeCS, Enhancement of high strain rate superplastic elongation of a modified 5154 Al by subsequent rolling after equal channel angular pressing. Scr Mater. 2004;51:479–483. doi: 10.1016/j.scriptamat.2004.06.001
22.
NikulinI, KaibyshevR, SakaiT. Superplasticity in a 7055 aluminum alloy processed by ECAE and subsequent isothermal rolling. Mater Sci Eng A. 2005;407:62–70. doi: 10.1016/j.msea.2005.06.014
23.
JinH, GallerneaultM, SegalVM, Grain structure and texture in aluminium alloy AA5083 after equal angular channel extrusion, warm rolling and subsequent annealing. Mater Sci Technol. 2011;27:789–792. doi: 10.1179/026708310X12701095964360
24.
HansenN. Accelerated and retarded crystallization in dispersion strengthened products. Mem Sci Rev Met. 1975;72:189–203.
25.
HumphreysFJ. The nucleation of recrystallization at second phase particles in deformed aluminium. Acta Metall. 1977;25:1323–1344. doi: 10.1016/0001-6160(77)90109-2
26.
SmithCS. Grains, phases and interfaces: an interpretation of microstructure. Trans Metall Soc AIME. 1948;175:15–51.
27.
HumphreysFJ, HatherlyM. Recrystallization and related annealing phenomena. Oxford: Pergamon; 1995.
28.
HumphreysFJ, KaluPN. The plasticity of particle-containing polycrystals. Acta Metall Mater. 1990;38:917–930. doi: 10.1016/0956-7151(90)90164-C
29.
MatsukiK, UenoY, YamadaM, Cavitation during superplastic deformation of an Al-Zn-Mg alloy. J Jpn Inst Metals. 1977;11:1136–1144. doi: 10.2320/jinstmet1952.41.11_1136
30.
TaitRA, TaplinDMR. Interaction effects during the growth of holes in a superplastically deforming medium. Scr Metall. 1979;13:77–82. doi: 10.1016/0036-9748(79)90394-6
31.
BaeDH, GhoshAK. Cavity growth during superplastic flow in an Al-Mg alloy: I. Experimental study. Acta Mater. 2002;50:993–1009. doi: 10.1016/S1359-6454(01)00399-8
32.
BaeDH, GhoshAK. Cavity growth in a superplastic Al-Mg alloy: II. An improved plasticity based model. Acta Mater. 2002;50:1011–1029. doi: 10.1016/S1359-6454(01)00400-1
