TY - JOUR
T1 - Precipitation microstructure and their strengthening effects of an Mg-2.8Nd-0.6Zn-0.4Zr alloy with a 0.2wt.% Y addition
AU - Li, J. H.
AU - Sha, G.
AU - Jie, W. Q.
AU - Ringer, S. P.
PY - 2012/3/15
Y1 - 2012/3/15
N2 - A micro-alloy addition of Y (0.2wt.%) produced a significant improvement in the tensile yield strength of an Mg-2.8Nd-0.6Zn-0.4Zr (wt.%) alloy at 200°C, with a 28% increase from 143MPa to 183MPa. APT characterisation confirmed that small solute clusters in a high number density were present in the as-quenched sample. TEM examinations revealed that β-type precipitates habiting on prism 1 1 2 0 planes were dominant in the sample after aged for 14h at 200°C, and they co-existed with γ-type precipitates on the basal plane of Mg matrix. The precipitation sequence of β-type precipitates is solute clusters→β'→β'→β1 before the peak hardness. There was significant clustering of solutes in the Y-containing alloy, but Y did not clearly partition into clusters or precipitates and remained in the Mg matrix. β', β' and β1 were measured with stoichiometric Mg9(Nd,Zn), Mg4(Nd,Zn) and Mg2(Nd,Zn), respectively.
AB - A micro-alloy addition of Y (0.2wt.%) produced a significant improvement in the tensile yield strength of an Mg-2.8Nd-0.6Zn-0.4Zr (wt.%) alloy at 200°C, with a 28% increase from 143MPa to 183MPa. APT characterisation confirmed that small solute clusters in a high number density were present in the as-quenched sample. TEM examinations revealed that β-type precipitates habiting on prism 1 1 2 0 planes were dominant in the sample after aged for 14h at 200°C, and they co-existed with γ-type precipitates on the basal plane of Mg matrix. The precipitation sequence of β-type precipitates is solute clusters→β'→β'→β1 before the peak hardness. There was significant clustering of solutes in the Y-containing alloy, but Y did not clearly partition into clusters or precipitates and remained in the Mg matrix. β', β' and β1 were measured with stoichiometric Mg9(Nd,Zn), Mg4(Nd,Zn) and Mg2(Nd,Zn), respectively.
KW - Atom probe tomography
KW - Magnesium alloy
KW - Mechanical properties
KW - Precipitation
KW - TEM
UR - http://www.scopus.com/inward/record.url?scp=84862807600&partnerID=8YFLogxK
U2 - 10.1016/j.msea.2012.01.043
DO - 10.1016/j.msea.2012.01.043
M3 - 文章
AN - SCOPUS:84862807600
SN - 0921-5093
VL - 538
SP - 272
EP - 280
JO - Materials Science and Engineering: A
JF - Materials Science and Engineering: A
ER -