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| 1 | Precipitate characteristics and their effects on the mechanical properties of as-extruded Mg-Gd-Li-Y-Zn alloy显示文摘In this work,a high-performance Mg-8.4 Gd-4.4 Li-3.5 Y-1.4 Zn(wt%)alloy was successfully prepared by low-temperature hot extrusion.The studied alloy has a TYS of 295±1 MPa and an EL of 2.5%±0.2%at room temperature,159±8 MPa and 15.9%±1.4%at 150℃,and 143±4 MPa and 19.8%±1.8%at200℃.The high performance at tempe ratures up to 200°is attributed to the dispersion strengthening of three Mg3 RE phase variants,the solid solution strengthening of alloying elements and the bimodal structure consisting of fine DRXed grains with random texture and coarse un-DRXed grains with basal texture.A novel island shapedβ_(1 R)phase(FCC,a=0.78 nm)with a size of 30 nm-100 nm is observed in the studied alloy.Theβ_(1 R)phase precipitates on the{1100}_(α)prismatic planes.The strain-induced,dislocationassisted dynamic precipitation during low-temperature hot extrusion is responsible for the formation of theβ_(1 R)phase.The growth of theβ_(1 R)phase is owing to the aid of the formation and transformation of zig-zag structures.The basal slip of dislocations is the dominate deformation mechanism of the studied alloy in the early stage of tensile deformation at room temperature,while non-basal slip of and dislocations at 200℃.Due to the strong interaction betweenβ_(1 R)precipitates and dislocations,the densely distributedβ_(1 R)precipitates significantly improve the mechanical properties via the Orowan strengthening both at room temperature and elevated temperatures. | Zijian Yu Xi Xu Adil Mansoor Baotian Du Kang Shi Ke Liu Shubo Li Wenbo Du | 2021 | Journal of Materials Science & Technology2021，，29： | 1 |
| 2 | Development and characteristics of a low rare-earth containing magnesium alloy with high strength-ductility synergy显示文摘In this study,we successfully developed a low RE containing Mg-3Y-2Gd-1Nd-0.5Zr(wt%)alloy with high strength-ductility synergy by combined processes of hot extrusion,hot rolling and ageing.This alloy exhibits an excellent strength-ductility balance(UTS of 345±2.0 MPa,TYS of 301±5.0 MPa and EL of 9.2±1.9%),which is better than that of many Mg-RE wrought alloys with higher RE concentration and even comparable to that of 6061 Al wrought alloy.A long-range chain-like structure consisting ofβphase,βH phase,βM phase and zig-zag atomic columns is observed for the first time in the studied alloy.The combined process of hot extrusion and hot rolling boosts the formation of deformed grains and low angle grain boundaries,and makes the deformed grains dominate in the alloy strengthening.Under this circumstance,the following ageing generates a novel heterogeneous structure comprising the long-range chain-like structure with broad interparticle spacing and the spacious precipitate-free zones in the deformed grains,which plays a key role in the concurrent strengthening and toughening of the alloy.The present study demonstrates that the deformed grains with long-range chain-like structures and precipitate-free zones is desirable microstructure for the low RE containing Mg alloys to achieve high strength-ductility synergy. | Zijian Yu Xi Xu Kang Shi Baotian Du Xiuzhu Han Tao Xiao Shubo Li Ke Liu Wenbo Du | 2023 | Journal of Magnesium and Alloys2023，11，5： | 1 |
| 3 | Correction to: Improving the Mechanical Properties of Mg–Gd–Y–Ag–Zr Alloy via Pre‑Strain and Two‑Stage Ageing显示文摘Correction to:Acta Metallurgica Sinica(English Letters)(2023)36:456-468 https:/doi.0rg/10.1007/s40195-022-01485-5 In the online published version,Tables 1 and 2 have appeared incorrectly due to technical glitch.The corrected tables are provided below:The original article has been corrected. | Baotian Du Zijian Yu Kang Shi Ke Liu Shubo Li Wenbo Du | 2023 | Acta Metallurgica Sinica(English Letters)2023，36，9： | 0 |
| 4 | Improving the Mechanical Properties of Mg–Gd–Y–Ag–Zr Alloy via Pre‑Strain and Two‑Stage Ageing显示文摘In this study,we investigated the effects of single-stage ageing(SSA),two-stage ageing(TSA),2%pre-strain+single-stage ageing(P2%SSA)and 2%pre-strain-I-two-stage ageing(P2%TSA)on the mechanical properties of as-extruded Mg-8Gd-3Y-0.5Ag-0.5Zr alloy(E alloy).Compared with the SSA treatment,the TSA treatment increased the number density of/β'phase.The P2%SSA and P2%TSA treatments generated theγ'phase and chain-like precipitates in addition to the/β'phase.The contributions of these ageing treatments to the alloy strengthening can be ranked as P2%TSA>P2%SSA>TSA>SSA,because the increments in the tensile yield strength were estimated to be 199 MPa>148 MPa>144 MPa>110 MPa.Different from the traditional strengthening of/β'phase in the E+SSA and E+TSA alloys,the composite precipitates comprising the/β'phase,γ'phase and chain-like precipitates in the E+P2%SSA and E+P2%TSA alloys provided better combined strengthening effect.The/β'phase was still dominated in the strengthening effect of the composite precipitates.Owing to the higher number density of/β'phase in the composite precipitates,the E+P2%TSA alloy exhibited the better mechanical performance as compared with the E+P2%SSA alloy.Finally,the E+P2%TSA alloy had the ultimate tensile strength of 452 MPa,the tensile yield strength of 401 MPa and elongation to failure of 3.3%. | Baotian Du Zijian Yu Kang Shi Ke Liu Shubo Li Wenbo Du | 2023 | Acta Metallurgica Sinica(English Letters)2023，36，3： | 0 |
| 5 | Precipitate Characteristics and Mechanical Performance of Cast Mg–6RE–1Zn–xCa–0.3Zr(x=0 and 0.4 wt%) Alloys显示文摘In this study,the Mg–4Y–1Gd–1Nd–xCa–1Zn–0.3Zr(x=0 and 0.4 wt%)cast alloys with low rare earth concentration were prepared in different routes of heat treatments,and their microstructures and mechanical properties were investigated.The Mg–4Y–1Gd–1Nd–1Zn–0.4Ca–0.3Zr cast alloy with ultimate tensile strength(UTS)of 264±7.8 MPa,tensile yield strength(TYS)of 153±1.2 MPa and elongation to failure(EL)of 17.2±1.2% was successfully developed by appropriate heat treatment.The improved mechanical performance was attributed to the combined strengthening effects of fine grains,Mg24RE5,β′,β_(1),γ′and LPSO phases.In the heat treatment process,cooling method of T4 treatment affected the microstructure,which consequently determined the mechanical properties air cooling,rather than water cooling,gave rise to the formation of γ′phase in the alloy without Ca addition.However,Ca addition facilitated the formation of γ′phase,and the γ′phase precipitated in the alloy after T4 treatment either by water cooling or by air cooling,but the air cooling increased the number density of γ′phase in comparison to the water cooling.Although the γ′phase strengthened the studied alloys,the formation of γ′phase inhibited the precipitatition of β′and β_(1) phases in the following T6 treatment,and consequently reduced the strengthening effect ofβ′andβ_(1) phases.The results showed that the mechanical performance of the studied alloys was largely determined by the precipitation of γ′phase,which was regulated by the Ca addition and the cooling method of T4 treatment. | Zijian Yu Xi Xu Baotian Du Kang Shi Ke Liu Shubo Li Xiuzhu Han Tao Xiao Wenbo Du | 2022 | Acta Metallurgica Sinica(English Letters)2022，35，4： | 0 |
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