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Tailoring the Texture and Mechanical Anisotropy of Multi-cross Rolled Mg-Zn-Gd Alloy by Annealing

Acta Metallurgica Sinica(English Letters) 2023年第2期36卷 251-265页

作者： Xihai Li Hong Yan rongshi chen School of Materials Science and Engineering University of Science and Technology of ChinaShenyang110016China Shi-Changxu Innovation Center for Advanced Materials Institute of Metal ResearchChinese Academy of SciencesShenyang110016China School of Materials Science and Engineering Shandong University of Science and TechnologyQingdao266590China

The unidirectional rolled Mg-Zn-Gd sheet usually exhibited non-basal texture with two peaks whose tilting angle were about 42°from normal direction to transverse direction(TD),which would cause the mechanical *** this study,multi-cross rolling followed by annealing was used to tailor the texture and mechanical anisotropy for Mg-Zn-Gd *** increasing annealing temperature,the rolled basal texture with two peaks gradually transformed into the circle texture with *** order to figure out different texture components evolution during annealing,the basal texture,R-texture and T-texture component were defined and *** results showed that the change of R-texture and T-texture component was asynchronous with increasing annealing temperature from 250 to 400℃.The tilting angle of R-texture component increased slightly,while the tilting angle of T-texture component increased obviously,and this phenomenon was attributed to the preferential nucleation at grain nucleation stage rather than preferential grain *** yield strength along TD was more sensitive to annealing temperature compared with that along rolling direction(RD),resulting in different descending slopes and yield strength anisotropy with increasing annealing *** at 300℃was the best annealing temperature due to low yield strength anisotropy,moderate strength and good elongation among these annealing *** Schmid factor for basal slip indicated that the activity of basal slip along RD increased slightly,while that along TD increased obviously with increasing annealing temperature from 250 to 400℃,which should be caused by the asynchronous change of R-texture component and T-texture component,consequently resulting in the transformation from isotropic yield strength to anisotropic yield strength.

关键词： Mg-Zn-Gd alloy Annealing Texture Yield strength Electron back-scattering diffraction(EBSD)

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Microstructure and Texture Evolution of Mg‑14Gd‑0.5Zr Alloy during Rolling and Annealing under Diferent Temperatures

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Acta Metallurgica Sinica(English Letters) 2023年第1期36卷 61-76页

作者： Chunxiao Li Hong Yan rongshi chen Shi-Changxu Innovation Center for Advanced Materials Institute of Metal ResearchChinese Academy of SciencesShenyang 110016China School of Materials Science and Engineering University of Science and Technology of ChinaHefei 230026China School of Materials Science and Engineering Shandong University of Science and TechnologyQingdao 266590China

Mg alloys containing high rare earth(RE)elements are hard to be rolled due to their low ductility and high strength at low ***,rolling at high temperatures is necessary for these *** this work,a Mg-14Gd-0.5Zr(wt%)alloy was rolled one pass with 40%reduction at high temperatures over 450°*** efects of rolling temperature on the microstructure and dynamic recrystallization behavior were analyzed in detail by the electron backscattered difraction(EBSD)*** results revealed that the alloy shows good rollability at high temperature due to the activity of nonbasal dislocations and ***,dynamic recrystallization is difcult to take place because of the easy activation of multi-slip system and thus more accumulated strain ***,Gd segregation was observed at the grain boundary and it is inferred that the segregation can partially enhance the dynamic recrystallization *** recrystallized grains with large size took place after short-term inter-pass annealing treatment ranging from 450℃to 500°C,and formed basal *** result suggests that the formation of basal texture during short-term annealing treatment was attributed to the growth of dynamic recrystallized grains caused by weakened Gd segregation.

关键词： Magnesium alloys Hot rolling Annealing Recrystallization Mg-Gd-Zr

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Superplasticity of Mg-5.8Zn-1Y-Zr alloy sheet fabricated by combination of extrusion and hot-rolling processes

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Science China(Technological Sciences) 2009年第1期52卷 166-171页

作者： YAN Hong chen rongshi HAN EnHou State Key Laboratory for Corrosion and Protections Institute of Metal ResearchChinese Academy of SciencesShenyang 110016China Graduate University of Chinese Academy of Sciences Beijing 100049China

Superplastic behaviors of quasicrystal phase containing Mg-5.8Zn-1Y-0.48Zr alloy sheets fabricated by combination of extrusion and hot-rolling processes have been investigated at temperature ranging from 623 to 753 K and at the strain rates ranging from 10-4 to 10-2 s-1 by uniaxial tensile tests. An excellent superplasticity with the maximum elongation to failure of 1020% was obtained at 753 K and the strain rate of 1.04×10-3 s-1 and its strain rate sensitivity, m, is as high as up to 0.75. The microstructure was stable during superplastic deformation due to the uniformly distributed fine quasicrystal particles. In addition, micro-cavities and their coalescences were observed in the superplastic deformation of the ZW61 magnesium alloy. Grain boundary sliding (GBS) was considered to be the main deformation mechanism during the superplastic deformation. Dislocation creep controlled by atom diffusion through grain boundaries or interior grains is suggested mainly to accommodate the GBS in super-plastic deformation.

关键词： magnesium alloy quasicrystal microvoid superplasticity

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Microstructural Stability of a Multiphase Ni-25Al-15Cr (at. pct) Intermetallic Alloy

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Journal of Materials Science & Technology 1999年第2期15卷 133-136页

作者： chen, rongshi Guo, Jianting Zhou, Jiyang Chinese Acad Sci Inst Met Res Dept Superalloys Shenyang 110015 Peoples R China Dalian Univ Technol Dept Mat Engn Dalian 116023 Peoples R China

The microstructure of multiphase Ni-25Al-15Cr (at. pct) intermetallic alloy consists of dendritic arms ( beta -NiAl phase) and interdendritic regions ( gamma / gamma ' two phases) under homogenization followed by air cooling condition. Furnace cooling following homogenization does not significantly influence its microstructure. However, the effects of aging treatment on the microstructure strongly depend on cooling rates following homogenization. A single phase gamma ' layer with a alpha Cr spouse layer was observed surrounding the dendritic arms, the formation of this couple is attributed to a four-phase invariant quasi-peritectoid. (Edited author abstract) 16 Refs.

关键词： Nickel alloys

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Low-cycle fatigue behavior of solutionized and aged WE43 magnesium alloys at room temperature

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Journal of Magnesium and Alloys 2024年第6期12卷 2284-2297页

作者： Yong Cai Jianxiong Wei Hong Yan Yipeng chen rongshi chen School of Materials Science and Engineering University of Science and Technology of China72 Wenhua RoadShenyang 110016China Shi-changxu Innovation Center for Advanced Materials Institute of Metal ResearchChinese Academy of Sciences72 Wenhua RoadShenyang 110016China School of Materials Science and Engineering Shandong University of Science and TechnologyQingdaoShandong 266590China

The low-cycle fatigue behavior of solutionized(T4)and aged(T6)WE43 magnesium alloys was studied at room *** total strain amplitudes(△ε_(t)/2)were 0.4%,0.5%,0.6%,0.7%and 1.0%.Detailed microstructure evolution was characterized by scanning electron microscope(SEM),electron backscattered diffraction(EBSD)and transmission electron microscopy(TEM).The results showed that plastic strain amplitude decreased with the increasing cycle number in T4 alloy,which is due to the dense persistent slip bands(PSBs)and dynamic precipitates hinderingdislocation *** contrast,the plastic strain amplitude increases gradually in T6 alloy,which is attributed to the enhanced activation of pyramidal *** low-cycle fatigue life of T6 alloy with larger fatigue ductility coefficient is longer than that of T4 *** Coffin-Manson model can accurately predict the fatigue life of T4 and T6 alloys compared to Jahed-Varvani(JV)energy *** T4 alloy,the fatigue damage mechanism was dominated by basal *** T6 alloy,the enhanced pyramidal slip plays an important role to accommodate plastic deformation.

关键词： Low-cycle fatigue WE43 alloy Cyclic hardening/softening JV model Dislocation

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Characterization and Prediction of Microporosity Defect in Sand Cast WE54 Alloy Castings

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Journal of Materials Science & Technology 2014年第10期30卷 991-997页

作者： Jilin Li rongshi chen Yuequn Ma Wei Ke State Key Laboratory for Corrosion and Protection Institute of Metal ResearchChinese Academy of Sciences

In order to study the effect of Zr modification and riser size on microporosity defect distributions in WE54 alloy sand castings, the microporosity volume percentage in Zr-free and Zr-containing WE54 alloy plate castings was determined by density measurement based on Archimedes＇ principle, and the microstructure of the microporosity defects was observed by optical microscopy and scanning electron microscopy. Then by using Procast software, the Niyama criterion was calculated in order to investigate the validity of Niyama criterion on prediction of microporosity defects in WE54 alloy sand castings. It is found from the density measurement results that Zr addition does not affect the microporosity distributions in WE54 alloy castings. While the distribution area of microporosity defect in the plate castings decreases significantly as the riser size increases. Based on the experimental results, a riser selection principle for production of compact WE54 alloy castings is proposed that the solidification modulus of the riser should be greater than that of the casting by 30%, simply mr ≥ 1.3mc. By comparing the experimental and simulating results, it is found that the predicted microporosity regions by Niyama criterion agrees well with experimental results, and a critical Niyama value of 0.4 ℃0.5 s0.5 mm-1 is suggested for prediction of microporosity formation in WE54 alloy sand castings.

关键词： Microporosity defect WE54 alloy Sand cast Niyama criterion

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Tailoring the texture and mechanical properties of 3%Y_(2)O_(3)p/ZGK200 composites fabricated by unidirectional and cross rolling followed by annealing

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Journal of Magnesium and Alloys 2024年第4期12卷 1479-1495页

作者： Xihai Li Hong Yan Zhiwei Shan rongshi chen Shi-changxu Innovation Center for Advanced Materials Institute of Metal ResearchChinese Academy of Sciences72 Wenhua RoadShenyang 110016China School of Materials Science and Engineering University of Science and Technology of China72 Wenhua RoadShenyang 110016China School of Materials Science and Engineering Shandong University of Science and TechnologyQingdaoShandong 266590China Center for Advancing Materials Performance from the Nanoscale(CAMP-Nano)and Hysitron Applied Research Center in China(HARCC) State Key Laboratory for Mechanical Behavior of MaterialsXi’an Jiaotong UniversityXi’an 710049China

3%Y_(2)O_(3)p/ZGK200 composites were subjected to unidirectional rolling(UR)and cross rolling(CR)at 400℃and 350℃followed by annealing at 300℃for 1 *** microstructure,texture and mechanical properties of rolled and annealed composites were systematically *** rolled composites exhibited a heterogeneous microstructure,consisting of deformed grains elongated along rolling direction(RD)and Y_(2)O_(3)particles bands distributed along *** annealing,static recrystallization(SRX)occurred and most deformed grains transformed into equiaxed grains.A non-basal texture with two strong T-texture components was obtained after UR while a non-basal elliptical/circle texture with circle multi-peaks was obtained after CR,indicating that rolling path had great influences on texture of the *** annealing process,R-texture component disappeared or weakened,as results,a non-basal texture with double peaks tilting from normal direction(ND)to transverse direction(TD)and a more random non-basal texture with circle multi-peaks were obtained for UR and CR composites,*** yield strength of rolled composites after UR showed obvious anisotropy along RD and TD while a low anisotropic yield strength was obtained after *** Y_(2)O_(3)particles broke during *** fracture of the composites was attributed to the existence of Y_(2)O_(3)clusters and interfacial debonding between particles and matrix during tension,as a result,the ductility was not as superior as matrix alloy.

关键词： Magnesium matrix composites Unidirectional rolling Cross rolling Texture Mechanical properties

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Hot Tearing of Sand Cast Mg-5 wt.% Y-4 wt.% RE (WE54) Alloy

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Acta Metallurgica Sinica(English Letters) 2013年第6期26卷 728-734页

作者： Jilin LI rongshi chen Yuequn MA Wei KE State Key Laboratory for Corrosion and Protection Institute of Metal ResearchChinese Academy of Sciences

Hot tearing is a common and severe defect occurring during solidification of castings. The rational understand- ing of hot tearing formation mechanism is beneficial to the foundry process design. In the present research, a new developed instrumented ＂CRC＂ equipment was applied in characterization of hot tearing in sand cast Mg-5 wt.% Y-4 wt.% RE （WE54） alloy with and without Zr addition. Microstructure observation and thermal analysis were carried out to help analyzing the results. The results showed that hot tearing onset occurs at a relatively low solid fraction （fs） in WE54 alloy sand castings, which indicates the participation of remaining liquid during hot tearing formation. Microstructure observation of the hot tearing surface also proves the liquid film existence between solidifying dendrites. The contraction strain caused by casting solidification induces the flowing of remaining liquid between solidifying dendrites and results in formation of interdendritic liquid films. These liquid films are separated by sufficient contraction stress and form hot cracks. The addition of Zr in WE54 alloy significantly refines the alloy microstructure and increases the solid fraction at hot tearing onset, both of which result in increasing of the fracture stress of interdendritic liquid film. Thus the hot tearing susceptibility of WE54 alloy is weakened by Zr addition.

关键词： Mg-5 wt.% Y-4 wt.% RE (WE54) magnesium alloy Sand cast Hot tearingdefect Instrumented "CRC"

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Formation mechanism of high-temperature oxidation film on WE43 magnesium alloy and its effect on corrosion performance

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Journal of Rare Earths 2024年第12期42卷 2316-2324页

作者： Ruizhi Ding Hong Yan Fangqiang Ning Yifan Song Jinliang Xu rongshi chen School of Materials Science and Engineering Shandong University of Science and Technology Shi-changxu Innovation Center for Advanced Materials Institute of Metal Research Chinese Academy of Sciences

The oxidation behavior of WE43 magnesium alloy in dry air at three temperatures（225, 440 and 525℃）and the corresponding corrosion performance of samples attached to oxide film in 3.5 wt% NaCl solution was investigated. The results show that the oxide films formed at all three temperatures are a complex MgO·RE2O3·ZrO film with different compositions. The film formed at 225℃ is flat and dense, whose components are 3.2MgO·1.8RE2O3·1ZrO. The oxidation ridges begin to form, and then gradually grow into nodular oxides and form a loose and porous oxide layer as the temperature increases to 525℃. The oxide films formed at all three temperatures improve the corrosion resistance of the alloy due to the MgO·RE2O3·ZrO, with the protective properties of oxide films following the order of 225℃ > 440℃ > 525℃, because the dense MgO·RE2O3·ZrO film formed at 225℃ can provide better protection to the substrate than the loose oxide film formed at higher temperatures.

关键词： Magnesium alloy High-temperature oxidation Oxide film Corrosion resistance Rare earths

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Solidification of Mg-Zn-Zr Alloys:Grain Growth Restriction,Dendrite Coherency and Grain Size

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Acta Metallurgica Sinica(English Letters) 2020年第11期33卷 1477-1486页

作者： Pei Li Danhui Hou En-Hou Han rongshi chen Zhiwei Shan State Key Laboratory for Mechanical Behavior of Materials Xi'an Jiaotong UniversityXi'an 710049China Institute of Metal Research Chinese Academy of SciencesShenyang 110016China

The solidification characterization of Mg-xZn-0.5Zr(x=0,1,3,4,5 wt%)alloys has been extensively investigated through thermal analysis,microstructure characterization and thermodynamic *** impact of Zn content on the grain growth restriction,dendrite coherency and thus the final grain size has been investigated and *** Zn content,the grain size of Mg-xZn-0.5Zr alloy was firstly refined and then coarsened with the finest grain size of^50μm for the Mg-3 Zn-0.5 Zr(ZK31)*** effects of the grain size on the mechanical properties were observed in the investigated *** combination of growth restriction factor theory and dendrite coherency point provides a reasonable explanation of the grain size *** helps to further understand the mechanisms of grain refinement and grain coarsening related to solute content,providing reference for alloy design and grain size prediction.

关键词： Magnesium alloy Grain size Solute content Growth restriction Dendrite coherency Solidifi cation

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