Effects of pre-stretching on microstructure and mechanical properties of WE43A alloy were investigated by optical microscope, transmission electron microscope, scanning electron microscopy and electronic universal material testing machine. The experimental results showed that a large number of dislocations and twins were formed in the matrix with the increase of deformation strain. During subsequent aging, β1 phases precipitated in dislocation area and distributed in matrix in a combined manner, honeycomb network and random. The precipitation of β1 increased the ultimate tensile strength and yield strength of WE43A alloy to 272 and 241 MPa, in comparison with the samples without pre-stretching (226 and 180 MPa). The fracture morphology of sample with strain 9% was transgranular cleavage fracture.
HamadK, KoYG.A cross-shear deformation for optimizing the strength and ductility of AZ31 magnesium alloys. Sci Rep. 2016;6:29954. doi: 10.1038/srep29954
2.
WuZ, CurtinWA.The origins of high hardening and low ductility in magnesium. Nature. 2015;526:62–67. doi: 10.1038/nature15364
3.
KulekciMK.Magnesium and its alloys applications in automotive industry. Int J Adv Manuf Tech. 2008;39:851–865. doi: 10.1007/s00170-007-1279-2
4.
HantzscheK, BohlenJ, WendtJ, Effect of rare earth additions on microstructure and texture development of magnesium alloy sheets. Scripta Mater. 2010;63:725–730. doi: 10.1016/j.scriptamat.2009.12.033
5.
StanfordN.Micro-alloying Mg with Y, Ce, Gd and La for texture modification – a comparative study. Mater Sci Eng A. 2010;527:2669–2677. doi: 10.1016/j.msea.2009.12.036
6.
BohlenJ, NürnbergMR, SennJW, The texture and anisotropy of magnesium-zinc-rare earth alloy sheets. Acta Mater. 2007;55:2101–2112. doi: 10.1016/j.actamat.2006.11.013
7.
YangM, GuoT, LiH.Effects of Gd addition on as-cast microstructure, tensile and creep properties of Mg-3.8Zn-2.2Ca (wt%) magnesium alloy. Mater Sci Eng A. 2013;587:132–142. doi: 10.1016/j.msea.2013.08.064
8.
WangYX, FuJW, YangYS.Effect of Nd addition on microstructures and mechanical properties of AZ80 magnesium alloys. Trans Nonferr Metal Soc. 2012;22:1322–1328. doi: 10.1016/S1003-6326(11)61321-6
9.
ChenJ, ZhangQ, LiQA.Effect of Y and Ca addition on the creep behaviors of AZ61 magnesium alloys. J Alloy Compd. 2016;686:375–383. doi: 10.1016/j.jallcom.2016.06.015
10.
GaoL, ChenRS, HanEH.Solid solution strengthening behaviors in binary Mg-Y single phase alloys. J Alloy Compd. 2009;472:234–240. doi: 10.1016/j.jallcom.2008.04.049
11.
LukyanovaEA, MartynenkoNS, ShakhovaI, Strengthening of age-hardenable WE43 magnesium alloy processed by high pressure torsion. Mater Lett. 2016;170:5–9. doi: 10.1016/j.matlet.2016.01.106
12.
BhattacharyyaJJ, WangF, McquadePJ, Deformation and fracture behavior of Mg alloy, WE43, after various aging heat treatments. Mater Sci Eng A. 2017;705:79–88. doi: 10.1016/j.msea.2017.08.067
13.
XinR, LiL, ZengK, Structural examination of aging precipitation in a Mg-Y-Nd alloy at different temperatures. Mater Charact. 2011;62:535–539. doi: 10.1016/j.matchar.2011.03.007
14.
XuZ, WeylandM, NieJF.On the strain accommodation of β1 precipitates in magnesium alloy WE54. Acta Mater. 2014;75:122–133. doi: 10.1016/j.actamat.2014.04.073
15.
AdamsJF, AllisonJE, JonesJW.The effects of heat treatment on very high cycle fatigue behavior in hot-rolled WE43 magnesium. Int J Fatigue. 2016;93:372–386. doi: 10.1016/j.ijfatigue.2016.05.033
16.
YuK, LiW, WangR, Effect of T5 and T6 tempers on a hot-rolled WE43 magnesium alloy. Mater Trans. 2008;49:1818–1821. doi: 10.2320/matertrans.MRA2008602
17.
KumarN, DendgeN, BanerjeeR, Effect of microstructure on the uniaxial tensile deformation behavior of Mg-4Y-3RE alloy. Mater Sci Eng A. 2014;590:116–131. doi: 10.1016/j.msea.2013.10.009
18.
NieJF.Precipitation and Hardening in magnesium alloys. Metall Mater Trans A. 2012;43:3891–3939. doi: 10.1007/s11661-012-1217-2
19.
SolomonELS, ChanT, ChenA, Aging behavior of Mg alloys containing Nd and Y. In: SolankiK, OrlovD, SinghA, editors. Mag Technol. Pittsburgh ( PA): Springer; 2017.
20.
NieJF, MuddleBC.Characterisation of strengthening precipitate phases in a Mg-Y-Nd alloy. Acta Mater. 2000;48:1691–1703. doi: 10.1016/S1359-6454(00)00013-6
21.
AntionC, DonnadieuP, PerrardF, Hardening precipitation in a Mg-4Y-3RE alloy. Acta Mater. 2003;51:5335–5348. doi: 10.1016/S1359-6454(03)00391-4
22.
SmolaB, Stulı´KováI.Equilibrium and transient phases in Mg-Y-Nd ternary alloys. J Alloy Compd. 2004;381:L1–L2. doi: 10.1016/j.jallcom.2004.02.049
23.
PalanivelS, MishraRS, BrennanRE, Accelerated age hardening response by in-situ ultrasonic aging of a WE43 alloy. Mater Manuf Process. 2016;33:104–108. doi: 10.1080/10426914.2016.1221094
24.
ZhaoSC, GuoEJ, WangLP, Effect of pre-compressive strain on microstructure and mechanical properties of Mg-2.7Nd-0.4Zn-0.5Zr alloy. Mater Sci Eng A. 2015;647:28–33. doi: 10.1016/j.msea.2015.08.092
25.
ShiGL, ZhangDF, ZhangHJ, Influence of pre-deformation on age-hardening response and mechanical properties of extruded Mg-6%Zn-1%Mn alloy. Trans Nonferr Metal Soc. 2013;23:586–592. doi: 10.1016/S1003-6326(13)62503-0
26.
GuoEJ, ZhaoSC, WangLP, Enhanced age strengthening of Mg-Nd-Zn-Zr alloy via pre-stretching. Metals. 2016;6:196. doi: 10.3390/met6090196
27.
ZhengKY, DongJ, ZengXQ, Effect of pre-deformation on aging characteristics and mechanical properties of a Mg-Gd-Nd-Zr alloy. Mater Sci Eng A. 2007;491:103–109. doi: 10.1016/j.msea.2008.01.067
28.
ChoudhuriD, MeherS, NagS, Evolution of a honeycomb network of precipitates in a hot-rolled commercial Mg-Y-Nd-Zr alloy. Phil Mag Lett. 2013;93:395–404. doi: 10.1080/09500839.2013.791751
29.
KumarN, ChoudhuriD, BanerjeeR, Strength and ductility optimization of Mg-Y-Nd-Zr alloy by microstructural design. Int J Plasticity. 2015;68:77–97. doi: 10.1016/j.ijplas.2014.11.003
30.
KangYH, WangXX, ZhangN, Effect of pre-deformation on microstructure and mechanical properties of WE43 magnesium alloy. Mater Sci Eng A. 2017;689:435–445. doi: 10.1016/j.msea.2017.02.082
31.
LiuDR, SunQY, ZhangJZ, Numerical simulation of macrosegregation during solidification of WE43 (Mg - 4.3wt%Y - 2.0wt%Nd - 0.6wt%Gd) magnesium alloy. Int J Cast Metal Res. 2016;29:376–392. doi: 10.1179/1743133615Y.0000000040
32.
SunQY, LiuDR, ZhangJJ, Numerical simulation of macrosegregation with grain motion during solidification of Mg-4wt.%Y alloy. Mod Phys Lett B. 2016;30:1650417. doi: 10.1142/S0217984916504170
33.
SunQY, WangLP, LiuDR, Effects of double-procedure homogenization heat treatment on microstructure and mechanical properties of WE43A alloy. Mater Res Express. 2018;5:086517. doi: 10.1088/2053-1591/aad31d
34.
StanfordN.The effect of calcium on the texture, microstructure and mechanical properties of extruded Mg–Mn–Ca alloys. Mater Sci Eng A. 2010;528:314–322. doi: 10.1016/j.msea.2010.08.097
35.
BarnettMR.Twinning and the ductility of magnesium alloys: part II. “contraction” twins. Mater Sci Eng A. 2007;464:8–16. doi: 10.1016/j.msea.2007.02.109
36.
MuS, JonasJJ, GottsteinG.Variant selection of primary, secondary and tertiary twins in a deformed Mg alloy. Acta Mater. 2012;60:2043–2053. doi: 10.1016/j.actamat.2012.01.014
37.
YangP, YuY, ChenL, Experimental determination and theoretical prediction of twin orientations in magnesium alloy AZ31. Scripta Mater. 2004;50:1163–1168. doi: 10.1016/j.scriptamat.2004.01.013
38.
WangY, LiJ.Phase field modeling of defects and deformation. Acta Mater. 2010;58:1212–1235. doi: 10.1016/j.actamat.2009.10.041
