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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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    Evaluation of high-temperature tensile behavior for metal foils by a novel resistance heating assisted tensile testing system using samples with optimized structures

    Qiu ZhengTsuyoshi Furushima
    216-229页
    查看更多>>摘要：To evaluate the tensile behavior of metal foils by resistance heating (RH) assisted tensile testing system accurately,this study proposed to embed a digital image correlation (DIC) system with laser speckles for the measurement of full-field strain distribution.Furthermore,the sample structures were optimized to achieve uniform temperature and strain distribution.An infrared camera was used to monitor the tem-perature distribution.Rectangular samples instead of dog-bone shaped samples were proposed.A model for calculating the temperature distribution was established to optimize the sample structure.The param-eters that influence the temperature distribution and tensile behavior were studied.As results,compared to the strain measured by a non-contact extensometer,the maximum deviation of the strain measured by DIC was less than 6％ when the nominal strain was larger than 0.013.It is confirmed that the proposed tensile testing system is reliable for measuring the temperature and full-field strain distributions.Sample shape influenced temperature distributions of smaller samples while it almost had no influence on the temperature distributions of larger samples.The temperature difference was not affected by the material type but by the sample size.The proposed rectangular shape was validated to be feasible for RH assisted tensile testing.The sample length was successfully optimized for a more uniform temperature distribu-tion by the established model.Although the tensile deformation was not influenced by the sample shape,the temperature distribution resulted in a non-uniform strain distribution before achieving ultimate ten-sile strength.Longer effective sample length between two clamping jigs contributed to a more uniform temperature distribution and material deformation.A more accurate evaluation of high-temperature ten-sile behavior for metal foils can be achieved by the proposed RH assisted tensile testing system using rectangular samples with an optimized structure.
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    Simple and rapid conversion of silicon carbide to nanodiamonds at ambient pressure

    Cheng YangBingqiang WeiKejian HePing Xu...
    230-238页
    查看更多>>摘要：Nanodiamonds (NDs) were prepared under ambient pressure by sublimation decomposition of silicon carbide in an intermediate frequency furnace for only 8 min.The synthesis proceeded in the temperature range of 2600-2800 ℃ without any catalyst or highly active gas components (such as H2,alkane,and halogen).The conversion began at 2600 ℃ and produced NDs with particle sizes in the range of 1-5 nm with a uniform particle shape and excellent dispersion.The linear reaction kinetics allowed for rapid transformation to any depth with reasonable control of the temperature.The linear rate constant (K1) for the reaction at 2800 ℃ was 37.5 mm/h,which is 31.2 times that of the reaction at 2600 ℃.The SiC sublimation decomposition produced carbon atoms that filled the SiC lattice vacancies or were combined with the suspended carbon chain bonds to form sp3 carbon,while the diffusion of amorphous carbon atoms promoted nucleation and growth of diamond.High-resolution transmission electron microscopy analysis indicated that the NDs were separated from the SiC matrix by break-off due to propagation of the reaction front.This SiC sublimation decomposition method is considered simple,fast,environmentally friendly and promising for industrial-scale production.
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    Carbon fibers@Co-ZIFs derivations composites as highly efficient electromagnetic wave absorbers

    Jiabin ChenJing ZhengQianqian HuangGehuan Wang...
    239-246页
    查看更多>>摘要：To reduce electromagnetic (EM) wave interference pollution,in this work,carbon fibers@Co-ZIFs deriva-tions (CFZD) as an advanced EM wave absorbing material was successfully prepared.The yolk-shell struc-ture of the magnetic metal particles generated a large amount of contact area,facilitating the interface polarization and relaxation.As a result,the optimized sample delivers a maximum reflection loss (RL)value of-19.2 dB with a bandwidth of 2.6 GHz at a small thickness of 1.3 mm.Additionally,ANSYS Elec-tronics Desktop 2018 (HFSS) was used to simulate the radar cross section (RCS) reduction in practical application based on these composites.The RCS values of composite coatings are less than-10 dB m2 at the range of-90° ＜theta＜-10° and 10° ＜theta＜90°,which indicate the effective reduction of the radar reflection signal by the composite coatings.The work is of reference significance for preparing great ab-sorbing materials and designing absorbing coatings by combining simulation method.
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    Formation of TiAlSi intermetallics during heating Ti-A356 Al mixed powder compact at semisolid temperature

    M.GaoT.J.ChenZ.X.Zhang
    247-263页
    查看更多>>摘要：Due to the similarity in composition and crystal structure of some TiAlSi ternary intermetallics,it is quite difficult to accurately confirm their physic characteristics,and thus,to tailor microstructure to improve mechanical properties of metal materials related to the TiAlSi intermetallics.Therefore,the formation pro-cess of TiAlSi intermetallics was investigated during heating Ti-A356 mixed powder compact at a A356 alloy semisolid temperature of 595 ℃.The results indicated that two kinds of intermetallics of τ1 (tetrag-onal,I41/amd) and τ2 (orthorhombic,Cmcm) generated,and both the concentration and supply direction of Ti atoms,which are related to local breakage of oxide films on neighboring Ti and A356 alloy pow-ders,determined the phase and morphology of the intermetallics.τ1 and τ2 crystals all had an intrinsic plate morphology,but τ2 crystals were thinner due to more anisotropic growth resulted from their high density of stacking faults (SFs).τ1 lamellar domains generated during growth of τ2 crystals,which were accompanied by decrease in density of SFs.The combined effect of size difference and internal energy difference between τ1 and τ2 crystals made large τ1 crystals coarsen at the expense of τ2 crystals in Ostwald ripening,leading them to finally evolve into an agglomerate of large τ1 plates.
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    Strengthening in Al-,Mo-or Ti-doped CoCrFeNi high entropy alloys:A parallel comparison

    Xi LiZhongtao LiZhenggang WuShijun Zhao...
    264-274页
    查看更多>>摘要：In the current work,a parallel comparison of the influence of Al,Mo and Ti,on the microstructure and strengthening of the CoCrFeNi alloy was conducted.To achieve this,inconsistencies on variables includ-ing the extent of alloying,thermomechanical processing and property-evaluation method were avoided.Microstructurally,following cold-rolling,annealing of the 4 at.％ Al-doped alloys at 800-1000 ℃ did not result in phase separation;nevertheless,that of the 4 at.％ Mo-and Ti-doped alloys led to the respective formation of σ and ηphase and,consequently,caused extra strengthening through the Orowan disloca-tion bypassing mechanism.Our systematic qualitative analysis and DFT calculations showed that Al and Ti are more effective than Mo in reducing the stacking fault energy (SFE) of the CoCrFeNi alloy,because they can induce more considerable deformation of electronic density,making the gliding of atomic layers easier.Following identical thermomechnical processing,Al-,Mo-,and Ti-doping causes different extent of solid solution strengthening and grain boundary strengthening.Mo causes the most pronounced solid solution strengthening but does not benefit the grain boundary strengthening;in contrast,the effective-ness of grain boundary strengthening is boosted by the doping Al and Ti.Current analyses support that Labusch instead of Fleischer mechanism is applicable to explain the differences in solid solution strength-ening,and the observed differences in grain boundary strengthening arise from the different tendency of Al,Mo and Ti to reduce the SFE of CoCrFeNi.In addition,we determined the value of the dimension-less parameter f in the Labusch model for CoCrFeNi-based alloys and observed a close relation between Hall-Petch slope and SFE.Although more in-depth studies are needed to provide full and mechanistic understandings,both these findings in fact presents significant values toward designing novel single-phase high-strength CoCrFeNi-based alloys through manipulating the solid solution and grain boundary strengthening by compositional tuning.
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