High temperature mechanical behavior of an extruded Mg-11Gd-4.5Y-1Nd-1.5Zn-0.5Zr (wt%) alloy
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In: Materials Science and Engineering A, Vol. 645, 01.10.2015, p. 213-224.
Research output: Journal contributions › Journal articles › Research › peer-review
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TY - JOUR
T1 - High temperature mechanical behavior of an extruded Mg-11Gd-4.5Y-1Nd-1.5Zn-0.5Zr (wt%) alloy
AU - Yu, Zijian
AU - Huang, Yuanding
AU - Dieringa, Hajo
AU - Lakshi Mendis, Chamini
AU - Guan, Renguo
AU - Hort, Norbert
AU - Meng, Jian
PY - 2015/10/1
Y1 - 2015/10/1
N2 - The microstructure-property relation of an extruded Mg-11Gd-4.5Y-1Nd-1.5Zn-0.5Zr (wt%) alloy was investigated by conducting hot compression and high temperature creep at temperatures upto 250°C. The alloy exhibits an average compressive yield strength (σ CYS) of 363±1MPa and an average elongation to failure (ε CF) of 10.5±0.2% at room temperature, 301±13MPa and 12.8±1.1% at 200°C. In creep the minimum creep strain rate (ε˙) is 1.94×10-9s-1 at 175°C/160MPa and 6.67×10-9s-1 at 200°C/100MPa. The obtained stress exponent n is in the range of 3.7-4.7, suggesting that the creep is controlled by the dislocation climb mechanism. The improvement in compressive strength and creep resistance is attributed to the fine recrystallized grains, SFs in the grain interior, Mg5RE and LPSO phases at grain boundaries. The alloy exhibits a bimodal texture with 〈0001〉 and 〈 10-0〉 components. Its strengthening effect is determined by the competition between these two texture components. In compressive deformation, the textural evolution from 〈10 1 - 0〉 to 〈0001〉 is mainly attributed to the operation of basal 〈a〉 slip and {10 1 - 2}〈 10 1 - 1 〉 tensile twinning. This texture evolution is not seen in creep.
AB - The microstructure-property relation of an extruded Mg-11Gd-4.5Y-1Nd-1.5Zn-0.5Zr (wt%) alloy was investigated by conducting hot compression and high temperature creep at temperatures upto 250°C. The alloy exhibits an average compressive yield strength (σ CYS) of 363±1MPa and an average elongation to failure (ε CF) of 10.5±0.2% at room temperature, 301±13MPa and 12.8±1.1% at 200°C. In creep the minimum creep strain rate (ε˙) is 1.94×10-9s-1 at 175°C/160MPa and 6.67×10-9s-1 at 200°C/100MPa. The obtained stress exponent n is in the range of 3.7-4.7, suggesting that the creep is controlled by the dislocation climb mechanism. The improvement in compressive strength and creep resistance is attributed to the fine recrystallized grains, SFs in the grain interior, Mg5RE and LPSO phases at grain boundaries. The alloy exhibits a bimodal texture with 〈0001〉 and 〈 10-0〉 components. Its strengthening effect is determined by the competition between these two texture components. In compressive deformation, the textural evolution from 〈10 1 - 0〉 to 〈0001〉 is mainly attributed to the operation of basal 〈a〉 slip and {10 1 - 2}〈 10 1 - 1 〉 tensile twinning. This texture evolution is not seen in creep.
KW - Compressive deformation
KW - Creep
KW - Hot extrusion
KW - Magnesium alloys
KW - Precipitation
KW - Engineering
UR - http://www.scopus.com/inward/record.url?scp=84939547664&partnerID=8YFLogxK
U2 - 10.1016/j.msea.2015.08.001
DO - 10.1016/j.msea.2015.08.001
M3 - Journal articles
AN - SCOPUS:84939547664
VL - 645
SP - 213
EP - 224
JO - Materials Science and Engineering A
JF - Materials Science and Engineering A
SN - 0921-5093
ER -