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材料科学技术（英文版）
材料科学技术（英文版）

胡壮麟

月刊

1005-0302

jmst@imr.ac.cn

024-83978208

110016

沈阳市沈河区文化路72号

材料科学技术（英文版）/Journal Journal of Materials Science & TechnologyCSCDCSTPCD北大核心EISCI
查看更多>>本刊简称《JMST》，（ISSN 1005-0302，CN 21-1315/TG）。1985年创刊。是中国科协主管，中国金属学会，中国材料研究学会和中国科学院金属研究所联合主办的国际性英文期刊，以“加强国际交流，扩大学术影响，服务经济建设”为办刊宗旨，刊登世界各国的具有创新性和较高学术水平的原始性论文，并设有物约综述、快报、简讯及国内外材料界杰出学者简介等栏目，内容包括金属材料、无机非金属材料、复合材料及有机高分子材料等。
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    Recrystallization behavior and microstructure evolution of Mg-5Bi-3Al alloy during very high-speed extrusion

    Sang-Cheol JinYe Jin KimDong Hee LeeSang-Ho Han...
    233-249页
    查看更多>>摘要：In our previous study,we extruded Mg-5Bi-3Al(BA53,wt.％)alloy at a very high speed of 70 m/min,and the high-speed-extruded alloy exhibited an unusual fine grain structure.Since dynamic recrystal-lization(DRX)behavior determines the microstructure and corresponding mechanical properties of the extruded alloy,understanding its origin is crucial for further improvement and optimization of alloys.Herein,the DRX behavior during high-speed extrusion of the recently developed BA53 alloy was inves-tigated in detail by analyzing the microstructure and texture of the extrusion butt along the extrusion path obtained by water quenching the remaining part of the billet immediately after extrusion.During the initial stages of extrusion with a high extrusion speed of 70 m/min and a high temperature of 400 ℃,tension twinning predominantly occurred in grains with a high Schmid factor(SF),switching the c-axis of the grains toward the transverse direction of the butt and causing the formation of a ring basal texture.In the intermediate stage,the microstructural changes were dominated by continuous and discontinuous DRX,resulting in the formation of fine recrystallized grains and orientation distribution originated from the parent grain.DRX was completed in the late stage wherein unrecrystallized grains with low SF for basal slip contributed to the late-stage recrystallization,strengthening the ring basal texture.Addition-ally,DRXed grains with favorable orientation for basal slip underwent lattice rotation,contributing to the formation of the obvious ring basal texture.Finally,preferential grain growth occurred after the DRX,leading to an increase in texture intensity and grain size of the extruded alloy.Therefore,the fine grain structure and ring basal texture obtained through high-speed extrusion were primarily attributed to the activated discontinuous DRX facilitated by a high strain rate and temperature.
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    Different mechanisms of A-site and B-site high entropy effect on radiation tolerance of pyrochlores

    Yuxin LiYiming LeiHao XiaoShuang Zhao...
    250-258页
    查看更多>>摘要：The properties of high entropy pyrochlore have been studied extensively,but there is no consistent con-clusion on its radiation tolerance.Besides,the mechanism of the high entropy effect on the radiation tolerance of pyrochlore is still unclear.In this work,combined with experiments and calculations of pyrochlores with similar cationic radius ratios,the A-site and B-site high entropy effects on structural evolution under irradiation are analyzed.In situ irradiation experiments were carried out on A-site high entropy pyrochlores such as(La0.2Nd0.2Sm0.2Gd0.2Er0.2)2Zr2O7,B-site Gd2(Ti1/3Sn1/3Zr1/3)2O7,and ternary pyrochlore Sm2Zr2O7 and Gd2Sn2O7 for comparison.The A-site high entropy pyrochlore can maintain a stable structure under high fluence irradiation like corresponding ternary pyrochlore,demonstrated by high angle annular dark field scanning transmission electron microscopy(HAADF-STEM),energy disper-sive spectroscopy(EDS)mapping and Raman spectrum.The additional irradiation experiments on A-site high entropy pyrochlores(La1/3Nd1/3Gd1/3)2Zr2O7 and(Nd1/3Sm1/3Gd1/3)2Zr2C7 also confirm the similarity under irradiation between A-site high entropy and ternary pyrochlores.However,the B-site high entropy pyrochlore Gd2(Ti1/3Sn1/3Zr1/3)2O7 becomes amorphous at exceptionally low irradiation fluences,indicat-ing a significantly distinct radiation tolerance compared with the A-site high entropy.The difference be-tween the A-site and B-site high entropy effect is analyzed from cationic lattice distortion,bond strength,and inner electron binding energy by first-principles calculations.The results reveal the role and mecha-nism of the high entropy effect in pyrochlores and lay a foundation for material design and future appli-cations.
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