| 1 | Comparison of microstructure and mechanical behavior of Ti-35Nb manufactured by laser powder bed fusion from elemental powder mixture and prealloyed powder显示文摘Although different types of powder feedstock are used for additive manufacturing via laser powder bed fusion(L-PBF),limited work has attempted to directly compare the microstructure and mechanical behavior of components manufactured from those powder feedstock.This work investigated the microstructure,phase composition,melt pool morphology,and mechanical properties of a prealloyed Ti-35Nb alloy manufactured using L-PBF and compared these to their counterparts produced from elemental powder mixture.The samples manufactured from the powder mixture are composed of randomly distributed undissolved Nb in theα/βmatrix,resulting from the unstable melt pool during the melting of the powder mixture.By contrast,parts produced from prealloyed powder display a homogeneous microstructure withβandαphases,owing to the full melting of prealloyed powder,therefore,a more stable melt pool to achieve a homogeneous microstructure.The Ti-35Nb manufactured from prealloyed powder exhibits large tensile ductility(about 10 times that of the counterparts using mixed powder),attributed to the high homogeneity in microstructure and chemical composition,strong interface bonding,relatively low oxygen content,and the existence of a large amount ofβphase.This work sheds insights into understanding the effect of powder feedstock on the melt pool stability therefore the microstructure and mechanical behavior of the resultant parts. | J.C.Wang Y.J.Liu S.X.Liang Y.S.Zhang L.Q.Wang T.B.Sercombe L.C.Zhang | 2022 | Journal of Materials Science & Technology2022，，10： | 4 |
| 2 | Strong enhancement on dye photocatalytic degradation by ball-milled TiO2:A study of cationic and anionic dyes显示文摘TiO_2 particles with desirable properties were produced by undergoing specific durations of ball milling.Characterizations of the TiO_2 particles before and after ball milling were investigated via X-ray diffraction(XRD), Brunauer-Emmett-Teller(BET), particle size analysis, zeta potential, and scanning electron microscope(SEM). The equilibrium adsorption data were well fitted to Langmuir, Freundlich, and Dubinin-Radushkevich(D-R) isotherms. Compared to the as-received TiO_2(mean particle size d150= 0.78μm, specific surface area = 88.17 m^2g^(-1), pore volume = 0.41 cm^3g^(-1)), the 60 min ballmilled TiO_2(d50= 0.55 μm, specific surface area = 99.48 m2g^(-1), pore volume = 0.48 cm3g^(-1)) enhanced the adsorption quantity of congo red and methylene blue from 10.4 mg g^(-1)to 13.6 mg g^(-1), and from17.0 mg g^(-1)to 22.2 mg g^(-1), respectively; and also improved the kinetic rates from k = 0.1325 to 0.2193, and k = 0.0944 to 0.1553, respectively. Dye adsorption and degradation efficiency of congo red was enhanced in acidic p H range(2–5.14), and methylene blue was enhanced in alkaline p H range(7.58–12). | Z.Jia L.B.T.La W.C.Zhang S.X.Liang B.Jiang S.K.Xie D.Habibi L.C.Zhang | 2017 | Journal of Materials Science & Technology2017，33，8： | 4 |
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