| 1 | Recent progresses on designing and manufacturing of bulk refractory alloys with high performances based on controlling interfaces显示文摘Refractory alloys such as tungsten and molybdenum based alloys with high strength,thermal/electrical conductivity,low coefficient of thermal expansion and excellent creep resistances are highly desirable for applications in nuclear facilities,critical components in aerospace and defense components.However,the serious embrittlement limits the engineering usability of some refractory alloys.A lot of research results indicate that the performances of refractory alloys are closely related to the physical/chemical status,such as the interface dimension,interface type,interface composition of their grain boundaries(GBs),phase boundaries(PBs)and other interface features.This paper reviewed the recent progress of simulations and experiments on interface design strategies that achieve high performance refractory alloys.These strategies include GB interface purifying/strengthening,PB interface strengthening and PB/GB synergistic strengthening.Great details are provided on the design/fabrication strategy such as GB interface controlling,PB interface controlling and synergistic control of multi-scaled interfaces.The corresponding performances such as the mechanical property,thermal conductivity,thermal load resistance,thermal stability,irradiation resistance,and oxidation resistance are reviewed in the aspect to the effect of interfaces.In addition,the relationships between these interfaces and material properties are discussed.Finally,future developments and potential new research directions for refractory alloys are proposed. | T.Zhang H.W.Deng Z.M.Xie R.Liu J.F.Yang C.S.Liu X.P.Wang Q.F.Fang Y.Xiong | 2020 | Journal of Materials Science & Technology2020，52，17： | 6 |
| 2 | INTERNAL FRICTION AND MODULUS DEFECT ASSOCIATED WITH THE MICROCRACKS IN MATERIALS显示文摘Inthis paper, theinvestigation of applying internalfriction ( ultrasonic attenuation) andmodulus defect(ultrasonic velocity change) tostudy the variation of dislocation density andlooplength withcycle numberintheearly fatiguestageisreviewed. On this basis,thecon ceptof characterization of fatigue microcrackformation and propagation assessed bythe mea surementofinternalfriction and dynamicalelastic modulusissuggested. Theanalyticalex pressionoftheinternalfriction and modulus defect associated with microcracksiscalculated underthe assumptionthatthe mechanicalenergy dissipation iscaused by the mutualfriction betweentheoppositefacesofthe microcrack. | Q.F.Fang Laboratory ofInternal Friction and Defectsin Solids,Institute of Solid State Physics, The Chinese Academy of Sciences, Hefei230031 ,China | 1999 | Acta Metallurgica Sinica(English Letters)1999，12，4： | 0 |
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