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| 1 | Dynamic mechanical relaxation behavior of Zr_(35)Hf_(17.5)Ti_(5.5)Al_(12.5)Co_(7.5)Ni_(12)Cu_(10)high entropy bulk metallic glass显示文摘Non-equiatomic high entropy bulk metallic glasses were reported recently and show unique mechanical and physical properties.Dynamic mechanical relaxation behavior of Zr_(35)Hf_(17.5)Ti_(5.5)Al_(12.5)Co_(7.5)Ni_(12)Cu_(10)high entropy bulk metallic glass was investigated by dynamic mechanical analysis(DMA)and the mechanical spectra could be well described by the quasi-point defects(QPD)theory.Compared to typical metallic glasses,the intensity of theβrelaxation of Zr_(35)Hf_(17.5)Ti_(5.5)Al_(12.5)Co_(7.5)Ni_(12)Cu_(10)high entropy bulk metallic glass is lower due to the sluggish diffusion.At the same time,the correlation factor is higher than that of conventional metallic glasses and this is ascribed to the high configuration entropy.In parallel,physical aging below the glass transition temperature leads to a decrease of atomic mobility,caused by a decrease of the concentration of defects. | L.T.Zhang Y.J.Duan T.Wada H.Kato J.M.Pelletier D.Crespo E.Pineda J.C.Qiao | 2021 | Journal of Materials Science & Technology2021，，24： | 2 |
| 2 | STUDY ON C-FIBER-REINFORCED CELSIAN-MATRIX COMPOSITES显示文摘Strong, tough, and almost fully dense C fiber reinforced celsian matrix composites have been fabricated by impregnation of the fiber tows with the matrix slurry, winding on a drum, drying, stacking the prepreg tapes in the desired orientation, and hot pressing. The monoclinic celsian phase in the matrix was produced in situ, during hot pressing, from amphosous BAS. The unidirectional composites having ≈20 vol% of fibers exhibited graceful failure with extensive fiber pullout in three point bend tests at room temperature. Values of ultimate flexural strength and fracture toughness were 379MPa and 8 3MPa·m 1/2 , respectively. | X.W.Yin, L.F.Cheng,L.T.Zhang, W.C.Zhou and Y.D.Xu State Key Laboratory of Solidification Processing, Northwestern Polytechnical University, Xi′an 710072, China | 1999 | Acta Metallurgica Sinica(English Letters)1999，12，5： | 2 |
| 3 | 查看详情显示文摘 | Y.D.Xu L.T.Zhang | | 0，，： | 1 |
| 4 | MARTENSITE-LIKE PHASE TRANSITIONS DUE TO POLAR REGION STRUCTURE IN DISORDERED FERROELECTRIC CERAMICS显示文摘Clear experimental evidence for phase transitions was shown in titanium doped lead magnesium niobate compositional disordered ferroelectric ceramics. One is the diffused phase transition around the temperature of dielectric permittivity maxima, which is often assumed as the characteristics of relaxor ferroelectrics. Another is a first order transition from frequency dispersion relaxor ferroelectrics to normal ferroelectrics, corresponding to a zero field spontaneous polar micro macrodomain switching. According to the x ray diffraction, thermal analysis and transmission electron microscope results, it is pointed out that the relaxor state corresponds to a coexistence of cubic parent phase and nucleating rhombohedral ferroelectric microregion which is similar to a precursor martensite. After the spontaneous relaxor normal ferroelectrics transition, the lower symmetry phase is sure to be a long range rhombohedral phase. Thus a dynamic behavior of polar microregions is suggested to explain the phenomena, which is more similar to a stress induced martensitic transformations from cubical stabilized perovskite parent phase. | H.Q.Fan and L.T.Zhang State Key Lab. of Solidification Processing, Northwestern Polytechnical University, Xi’an 710072, China | 1999 | Acta Metallurgica Sinica(English Letters)1999，12，5： | 1 |
| 5 | Analysis of the anelastic deformation of high-entropy Pd_(20)Pt_(20)Cu_(20)Ni_(20)P_(20) metallic glass under stress relaxation and recovery显示文摘The anelastic deformation behavior of Pd_(20)Pt_(20)Cu_(20)Ni_(20)P_(20) high-entropy metallic glass was probed by monitoring the stress relaxation and recovery processes. The stress relaxation under consecutive strain steps can be described by the Kohlrausch-Williams-Watts(KWW) function. In addition, considering a hierarchy of relaxation processes related to the structural heterogeneity, a constitutive model is proposed in order to describe the whole process of stress relaxation and determine the contribution of different time scales. Moreover, a crossover from stochastic activation to percolation of flow defects with the ultimate strain can be observed during stress relaxation process. The anelastic recovery process after a strain step is studied as a function of the initial strain level and characterized by means of a direct spectrum analysis. The peaks in the recovery time-spectra revealed the evolution of flow defects in Pd_(20)Pt_(20)Cu_(20)Ni_(20)P_(20) high-entropy metallic glass. The understanding of the atomic free-volume zones effect and the anelastic deformation provides important insight into how atomic structural features affect the deformation behavior of high-entropy metallic glasses, and may provide a new avenue into the improvement of their mechanical properties. | Y.J.Duan L.T.Zhang T.Wada H.Kato E.Pineda D.Crespo J.M.Pelletier J.C.Qiao | 2022 | Journal of Materials Science & Technology2022，，12： | 0 |
| 6 | Training β relaxation to rejuvenate metallic glasses显示文摘In the current work,we demonstrated that the rejuvenation of metallic glasses can be achieved through training theβrelaxation process.With the increase in the training frequency,a transition from structural relaxation to rejuvenation can be observed.This rejuvenation treatment is unexpected due to it occurs at a relatively small cyclic strain of 0.2%.Rejuvenation is beneficial to increase the relaxation enthalpy and promotes the decoupling of theβrelaxation process andαrelaxation process.A cluster ofβrelaxation time curves are formulated to describe any energetic state between ultrastable and ultimately rejuvenated metallic glasses.In addition,rejuvenation expands the distribution ofβrelaxation process,anelastic and viscoplastic components during the deformation process. | L.T.Zhang Yun-Jiang Wang Y.Yang J.C.Qiao | 2023 | Journal of Materials Science & Technology2023，，27： | 0 |
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