Tensile tests with pulse current for AZ31 alloy under room temperature and different voltages were carried out. Pulse current influence on the critical condition of initial dynamic recrystallisation for AZ31 alloy was investigated. The critical value was determined by one-parameter approach and validated by metallographic observation. The results showed that, with current voltage increased, the ultimate strength decreased, and the amount of strain hardening before reaching the ultimate strength decreased. When the voltage increases, high dynamic recrystallisation degree can be obtained, but due to the high electroplastic effect, the dynamic recrystallisation grain grows up and the material mechanical property deteriorates. The microstructure observation proved that the critical condition for initial dynamic recrystallisation can be determined with the one-parameter approach.
ZhuR. F., TangG. Y., ShiS. Q. and FuM. W.: ‘Microstructure evolution of copper strips with gradient temperature in electropulsing treatment’, J. Alloys Compd, 2013, 581, 160–165.
3.
ZhouY., QinR., XiaoS., HeG. and ZhouB.: ‘Reversing effect of electropulsing on damage of 1045 steel’, J. Mater. Res., 2000, 15, (5), 1056–1061.
4.
ZhangX. F., LuW. J. and QinR. S.: ‘Removal of MnS inclusions in molten steel using electropulsing’, Scr. Mater., 2013, 69, (6), 453–456.
5.
QinR. S., RahnamaA., LuW. J., ZhangX. F. and Elliott-BowmanB.: ‘Electropulsed steels’, Mater. Sci. Technol., 2014, 30, (9), 1040–1044.
6.
CaoW. H., ZhangJ. L. and ShekC. H.: ‘Effects of electropulsing treatment on mechanical properties in Ti rich TiNi shape memory alloy’, Mater. Sci. Technol., 2013, 29, (9), 1135–1138.
7.
XuZ., TangG., TianS., DingF. and TianH.: ‘Research of electroplastic rolling of AZ31 Mg alloy strip’, J. Mater. Process. Technol., 2007, 182, (1–3), 128–133.
8.
JiangY., GuanL., TangG., ShekC. and ZhangZ.: ‘Influence of electropulsing treatment on microstructure and mechanical properties of cold-rolled Mg–9Al–1Zn alloy strip’, Mater. Sci. Eng. A, 2011, A528, (16–17), 5627–5635.
9.
HuG., WangZ., ZhuY., LiuJ. and TangG.: ‘Dynamic electropulsing induced evolution of basal texture and its effect on properties of magnesium alloy AZ61’, Mater. Trans., 2011, 52, (8), 1565–1568.
10.
XuQ., GuanL., JiangY., TangG. and WangS.: ‘Improved plasticity of Mg–Al–Zn alloy by electropulsing tension’, Mater. Lett., 2010, 64, (9), 1085–1087.
11.
LinS. X., ChuX. R., BaoW. K., GaoJ. and RuanL. Q.: ‘Experimental investigation of pulse current on mechanical behaviour of AZ31 alloy’, Mater. Sci. Technol., 2015, 31, (9), 1131–1138.
12.
KoikeJ., KobayashiT., MukaiT., WatanabeH., SuzukiM., MaruyamaK. and HigashiK.: ‘The activity of non-basal slip systems and dynamic recovery at room temperature in fine-grained AZ31B magnesium alloys’, Acta Mater., 2003, 51, (7), 2055–2065.
13.
GaliyevA., KaibyshevR. and GottsteinG.: ‘Correlation of plastic deformation and dynamic recrystallization in magnesium alloy ZK60’, Acta Mater., 2001, 49, (7), 1199–1207.
14.
JiangY., TangG., ShekC., XieJ., XuZ. and ZhangZ.: ‘Mechanism of electropulsing induced recrystallization in a cold-rolled Mg–9Al–1Zn alloy’, J. Alloys Compd, 2012, 536, 94–105.
15.
JiangY., TangG., ShekC. and LiuW.: ‘Microstructure and texture evolution of the cold-rolled AZ91 magnesium alloy strip under electropulsing treatment’, J. Alloys Compd, 2011, 509, (11), 4308–4313.
16.
XuQ., TangG., JiangY., HuG. and ZhuY.: ‘Accumulation and annihilation effects of electropulsing on dynamic recrystallization in magnesium alloy’, Mater. Sci. Eng. A, 2011, A528, (7–8), 3249–3252.
17.
PoliaktE. I. and JonassJ. J.: ‘A one-parameter approach to determining the critical conditions for the initiation of dynamic recrystallization’, Acta Mater., 1996, 44, (4), 127–136.
18.
KimS. -I. and YooY. -C.: ‘Dynamic recrystallization behavior of AISI 304 stainless steel’, Mater. Sci. Eng. A, 2001, A2, 108–113.
19.
ManonukulA. and DunneF. P. E.: ‘Initiation of dynamic recrystallization under inhomogeneous stress states in pure copper’, Acta Mater., 1999, 47, (17), 4339–4354.
20.
GuangjieH., BaohuaQ., LingyunW. and JonasJ. J.: ‘Study on the critical conditions for initial dynamic recrystallization of AZ31 magnesium alloy’, Rare Met. Mater. Eng., 2007, 36, (12), 2080–2083.
21.
DzialoC. M., SiopisM. S., KinseyB. L. and WeinmannK. J.: ‘Effect of current density and zinc content during electrical-assisted forming of copper alloys’, CIRP Ann.-Manuf. Technol., 2010, 59, (1), 299–302.
22.
DariavachN. G. and RiceJ. A.: ‘Electromigration and the electroplastic effect in aluminum SiC MMCs’, JOM, 2000, 52, (5), 40–42.
