Constitutive analysis of AZ31 magnesium alloy plate

Abstract

The plastic deformation simulation of AZ31 magnesium alloy at different elevated temperatures (from 473 to 723 K) was performed on Gleeble-1500 thermal mechanical simulator at the strain rates of 0.01, 0.1, 1, 5 and 10 s⁻¹ and the maximum deformation degree of 80%. The relationship between the flow stress and deformation temperature as well as strain rate was analyzed. The materials parameters and the apparent activation energy were calculated. The constitutive relationship was established with a Zener-Hollomon (Z) parameter. The results show that the flow stress increases with the increase of strain rate at a constant temperature, but it decreases with the increase of deformation temperature at a constant strain rate. The apparent activation energy is estimated to be 129–153 kJ/mol, which is close to that for self-diffusion of magnesium. The established constitutive relationship can reflect the change of flow stress during hot deformation.

Keywords

AZ31 magnesium alloy / hot deformation / flow stress / constitutive relationship

References

[1] MordikeB. L., EbertT.. Magnesium properties—application—potential[J]. Materials Science and Engineering A, 2001, 302(1): 37-45

[2] YuK., LiW.-x., ZhaoJ., MaZ.-q., WangR.-chu.. Plastic deformation behavior of a Mg-Ce-Zn-Zr alloy [J]. Scripta Materialia, 2003, 48(9): 1319-1323

[3] ZhangB.-p., TuY.-f., ChenJ.-y., ZhangH.-l., KangY.-l., SuzukiH. G.. Preparation and characterization of as-rolled AZ31 magnesium alloy sheets [J]. Journal of Materials Processing Technology, 2007, 184(1/3): 102-107

[4] BeausirB., SuwasS., TóthL. S., NealeK. W., FundenbergerJ. J.. Analysis of texture evolution in magnesium during equal channel angular extrusion [J]. Acta Materials, 2007, 56(2): 200-214

[5] LinY. C., ChenM. S., ZhongJ.. Effect of temperature and strain rate on the compressive deformation behavior of 42CrMo steel [J]. Journal of Materials Processing Technology, 2008, 205(1/3): 308-315

[6] ChinoY., KadoM., MabuchiM.. Compressive deformation behavior at room temperature — 773 K in Mg-0.2mass% (0.035at%)Ce alloy [J]. Acta Materials, 2008, 56(3): 387-394

[7] GaliyevA., KaibyshevR.. Superplasticity in a magnesium alloy subjected to isothermal rolling [J]. Scripta Materialia, 2004, 512(2): 89-93

[8] SpigarelliS., MehtediM. E., CabibboM., EvangelistaE., KanekoJ., JaegerA., GartnerovaV.. Analysis of high-temperature deformation and microstructure of an AZ31 magnesium alloy [J]. Materials Science and Engineering A, 2007, 462(1/2): 197-201

[9] ChengY.-q., ZhangH., ChenZ.-h., XianK.-feng.. Flow stress equation of AZ31 magnesium alloy sheet during warm tensile deformation [J]. Journal of Materials Processing Technology, 2008, 208(1/3): 29-34

[10] SlooffF. A., ZhouJ., DuszczykJ.. Constitutive analysis of wrought magnesium alloy Mg-Al4-Zn1 [J]. Scripta Materialia, 2007, 57(8): 759-762

[11] SivapragashM., LakshminarayananP. R., KarthikeyanR., HanumanthaM., BhattR. R.. Hot deformation behavior of ZE41A magnesium alloy [J]. Materials and Design, 2008, 29(4): 860-866

[12] PengY.-hong.Plastic forming simulation technology of metals [M], 1999, Shanghai, Shanghai Jiaotong University Press

[13] NiuJ.-tai.Physical simulation in materials and hot-working [M], 1999, Beijing, National Defense Industry Press

[14] GaliyevA., KaibyshevR., GottsteinG.. Correlation of plastic deformation and dynamic recrystallization in magnesium alloy ZK60 [J]. Acta Materials, 2001, 49(7): 1199-1207

[15] McqueenH. J., RyanN. D.. Constitutive analysis in hot working [J]. Materials Science and Engineering A, 2002, 322(1/2): 43-63

[16] YinD. L., ZhangK. F., WangG. F., HanW. B.. Warm deformation behavior of hot-rolled AZ31 Mg alloy [J]. Materials Science and Engineering A, 2005, 392(1/2): 320-325

[17] PoirierJ. P.Plastic deformation of crystal at high temperature [M], 1989, Dalian, Dalian Science and Technology University Press

[18] BarnettM. R.. Influence of deformation conditions and texture on the high temperature flow stress of magnesium AZ31 [J]. Journal of Light Metals, 2001, 1(3): 167-177

[19] TakudaH., FujimotoH., HattaN.. Modelling on the flow stress of Mg-Al-Zn alloys at elevated temperatures [J]. Journal of Materials Processing Technology, 1998, 80/81(1): 513-516

[20] PrasadY. V. R. K., RaoK. P.. Effect of crystallographic texture on the kinetics of hot deformation of rolled Mg-3Al-1Zn alloy plate [J]. Materials Science and Engineering A, 2006, 432(1/2): 170-177

[21] SpigarelliS., CabibboM., EvangelistaE., TaliankerM., EzerskyV.. Analysis of the creep behavior of a thixoformed AZ91 magnesium alloy [J]. Materials Science and Engineering A, 2000, 289(1/2): 172-181