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Enhancing the high-temperature creep properties of mo alloys via nanosized La_(2)O_(3) particle addition

Journal of Materials Science & Technology 2022年第35期130卷 53-63页

作者： P.M.Cheng C.Yang P.Zhang J.Y.Zhang H.Wang J.Kuang G.Liu J.Sun State Key Laboratory for Mechanical Behavior of Materials Xi’an Jiaotong UniversityXi’an 710049China School of Mechanical Engineering Chengdu UniversityChengdu 610106China

molybdenum(mo) alloys with different La_(2)O_(3)particle additions(0.6,0.9,1.5 wt.%) were prepared by powder metallurgy to investigate the effect of La_(2)O_(3)particles on microstructural evolution and creep behavior of the *** mo,annealed at 1500℃ for 1 h,presented a fully recrystallized microstructure characterized by equiaxed *** alloys doped with La_(2)O_(3)particles(mo-La_(2)O_(3)alloys),on the other hand,exhibited fibrous grains elongated in the rolling direction of the *** contrast to the shape of the grains,the average grain size of the alloys was found to be insensitive to the addition of La_(2)O_(3)*** La_(2)O_(3)particles with diameters ranging from 65 to 75 nm were distributed within the grain *** creep tests showed that dislocation creep was the predominant deformation mode at intermediate creep rate(10^(-7)s^(-1)-10^(-4)s^(-1)) in the present *** creep stress exponent and activation energy were found to decrease with increasing temperature,particularly within the low creep rate regime(mo-La_(2)O_(3)alloys exhibited remarkably greater apparent stress exponent and activation energy than pure mo.A creep constitutive model based on the interaction between particles and dislocations was utilized to rationalize the nanoparticle-improved creep *** was demonstrated that low relaxed efficiency of dislocation line energy,which is responsible for an enhanced climb resistance of dislocations,is the major creep strengthening mechanism in the mo-La_(2)O_(3)*** addition,the area reduction and creep fracture mode of the mo-La_(2)O_(3)alloys were found to be a function of the creep rate and temperature,which can be explained by the effect of the two parameters on the creep and fracture mechanisms.

关键词： mo alloys Nanosized particles Creep strength Deformation and fracture

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Densification of mo alloys at 1473K

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Journal of Wuhan University of Technology(Materials Science) 2003年第2期18卷 41-42页

作者：龚道仁 Wuhan University of Technology

By choosing different weight contents of Ni and Cu,mo alloys have been densified under 1473K-30MPa-1h in a vacuum *** experimental results indicate that,when the contents of Ni and Cu are 3wt% and 2wt% respectively,the relative density of the sample reaches the maximum *** and Cu play different roles in the process of sintering,the powder Ni,dissolved in the liquid Cu,shows more activating sintering feature for mo than the solid Ni.

关键词： graded flier-plate mo alloys sintering densification hot-pressing sintering

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Densification of mo alloys at 1473 K by Adding Ni-Cu Solid Solution

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Journal of Materials Science & Technology 2004年第3期20卷 361-362页

作者： DaorenGONG ZhongminYANG QiangSHEN LianmengZHANC StateKeyLab.ofAdvancedTechnologyforMaterialsSynthesisandProcessing WuhanUniversityofTechnologyWuhan430070China ShanghaiInstituteofOpticsandFineMechanics ChineseAcademyofSciencesShanghai201800China

mo is difficult to sinter densely at a relatively low temperature due to its high melting point. In the present paper,by adding different weight contents of Ni and Cu additives, mo alloys have been densified at 1473 K for an hour byhot-pressing method, and the optimum contents of Cu and Ni additives have been acquired: when the contents of Niand Cu are 3 and 2 wt pct respectively, the relative density of the sample reaches the maximum value. It was foundthat when the Ni-Cu solid solution was added into mo alloys. the achieved density is higher than the case of Ni andCu additives. The experimental results indicate that, Ni and Cu play different roles in the process of sintering, theNi-Cu solid solution has the same function as Ni and Cu additives in the course of sintering mo alloys, It shows moreactivating sintering feature for mo than the Ni and Cu additives.

关键词： mo alloys Ni-Cu solid solution Sintering densification Hot-pressing sintering

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