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| 1 | The effect of Co and Cr substitutions for Ni on mechanical properties and plastic deformation mechanism of FeMnCoCrNi high entropy alloys显示文摘The elastic constants,ideal tensile strength(ITS),stacking fault energy(SFE),lattice constant and magnetic moment of FeMnCoCrNi high entropy alloys with varying Co and Cr contents at 0 and 300 K were systematically investigated by first-principle calculations.For the alloys with Co substitution for Ni,at both temperatures the elastic stability of the face-centered cubic(fcc)phase,bulk elastic modulus(B),Young’s modulus(E),shear modulus(G)and ITS increase monotonically with increasing Co content.However,the Cauchy pressure(Cp),Pugh ratio(B/G),Poisson ratio(v),Zener anisotropy ratio(AZ)and elastic anisotropy ratio(AVR)decrease monotonically.The SFE also decreases with the increase of Co,resulting in the change of plastic deformation mechanism from dislocation slip to mechanical twinning,and then to hcp-martensitic transformation.This elucidates the underlying mechanism of the effect of Co addition on the strength and micromechanical behavior of FeMnCoCrNi alloys.Compared with Co,the Cr substitution for Ni leads to the more complex change of elastic constants and ITS.The increase of Cr shows the similar effect on SFE and deformation mechanism as that of Co.The variation of valence electron concentration and magnetism affect the SFE.The increase of either Co or Cr leads to the reduced magnetic moments of Fe and Mn.This could be responsible for the monotonic decrease of both lattice constant and SFE as the Co content increases.However,for the Cr addition case,multiple factors may affect the evolution of lattice constant and SFE.These findings shed light on the deformation mechanism of the alloys with different compositions. | H.F.Zhang H.L.Yan H.Yu Z.W.Ji Q.M.Hu N.Jia | 2020 | Journal of Materials Science & Technology2020，47，13： | 5 |
| 2 | Distribution of Be in a Ti-Based Bulk Metallic Glass Composite Containing B-Ti显示文摘In order to obtain a glassy matrix during quenching, Be is often selected as a constituent of the compositions of Ti/Zr-based bulk metallic glass composites(BMGCs). The in situ formed β phase in Be-bearing BMGCs was reported to be Be-free. However, a thorough investigation of the distribution of Be in BMGCs is still missing to date. In this work, the distribution of Be in a Ti_(47.5)Zr_(33)Cu_(5.8)Co_3Be_(12.5)(at.%) BMGC was studied by the secondary ion mass spectrometry(SIMS) and the electron energy loss spectroscopy(EELS).It is found that Be almost totally dissolves in the glassy matrix, but a very weak intensity of Be in β phase is still detectable by SIMS, and the content of Be in β-Ti is estimated to be about 0.3 at.%. Based on the recently established two-phase quasi-equilibrium of BMGCs, the distinct solubility of Be in the glassy matrix and in β-Ti has been explained. | L.Zhang W.Q.Li Z.W.Zhu H.M.Fu H.Li Z.K.Li H.W.Zhang A.M.Wang H.F.Zhang | 2017 | Journal of Materials Science & Technology2017，33，7： | 3 |
| 3 | New ductile laminate structure of Ti-alloy/Ti-based metallic glass composite with high specific strength显示文摘Bulk laminate structure of Ti-alloy/Ti-based metallic glass composite(MGC) was prepared by melting a preform of alternate stack-up foils in the high vacuum atmosphere. The composite demonstrates a good combination of yield strength(~1618 MPa), plasticity(~4.3%) and specific fracture strength(384 × 10~3 Nmkg^(-1)) in compression. The maintained yield strength results from the unique microstructure composed of the Ti layer, the solution layer with gradient structure and the MGC layer. Such a multilayer structure effectively inhibits the propagation of shear band, leading to the enhanced plasticity. Those extraordinary properities suggest that combining ductile lamella with brittle metallic glass(MG) by such a lay-up method can be an effective way to improve mechanical properties of MG. | D.Li Z.W.Zhu A.M.Wang H.M.Fu H.Li H.W.Zhang H.F.Zhang | 2018 | Journal of Materials Science & Technology2018，34，4： | 2 |
| 4 | Photocatalytic degradation in aqueous solution using quantum-sized ZnO particles supported on sepiolite显示文摘 | W.G.Xu S.F.Liu S.X.Lu S.Y.Kang Y.Zhou and H.F.Zhang | | 0，，： | 1 |
| 5 | Formation and corrosion behavior of Fe-based amorphous metallic coatings by HVOF thermal spraying显示文摘 | Z.Zhou L.Wang F.C.Wang H.F.Zhang Y.B.Liu and S.H.Xu | | 0，，： | 1 |
| 6 | Randomly mixed model for predicting the effective thermal conductivity of moist porous media显示文摘 | H.F.Zhang X.S.Ge H.Ye | | 0，，： | 1 |
| 7 | 查看详情显示文摘 | H.F.Zhang R.R.Liu Z.Wang B.H.Wang | | 0，，： | 1 |
| 8 | Influence of high configuration entropy on damping behaviors of Ti-Zr-Hf-Ni-Co-Cu high entropy alloys显示文摘TiNi-based shape memory alloys(SMAs)have been used as damping materials to eliminate noise and mechanical vibration.However,their application is limited by low working temperatures and damping capacity.In this work,two novel Ti-Zr-Hf-Ni-Co-Cu high entropy shape memory alloys(HESMAs)with different transformation temperatures and damping properties were investigated.The results show that Ti_(25)Zr_(8)Hf_(17)Ni_(30)Co_(5)Cu_(15) has superior damping performance arising from martensitic transformation,shape memory effect(thermal cycle at constant load)as well as superelasticity.Compared to traditional TiNi-based SMAs,the as-cast HESMAs exhibit a much higher ultrahigh yield strength(∼2 GPa)and storage modulus(∼50 GPa).The high configuration entropy of the HESMAs with high uneven internal stress and severe lattice distortion is revealed as the underlying mechanisms governing distinctive damping performance.The effects of high configuration entropy and microheterogeneity on the martensitic transforma-tion behavior and damping performance of HESMAs are clarified in this work,which provides a basis for designing alloys with superior damping properties. | W.Q.Wu L.Zhang K.K.Song J.M.Pelletier H.F.Zhang J.C.Qiao | 2023 | Journal of Materials Science & Technology2023，，22： | 0 |
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