| 2 | Microstructures and Hardness Properties for β-Phase Ti-24Nb-4Zr-7.9Sn Alloy Fabricated by Electron Beam Melting显示文摘Atomized,pre-alloyed Ti—24Nb—4Zr—7.9Sn(wt%) powder was used to fabricate solid,prototype components by electron beam melting(EBM).Vickers microindentation hardness values were observed to average 2 GPa for the precursor powder and 2.5 GPa for the solid,EBM-fabricated products.The powder and solid product microstructures were examined by optical and electron microscopy.X-ray diffraction analyses showed that they had bcc β-phase microstructure.However,it was found by transmission electron microscopy that the EBM-fabricated product had plate morphology with space ~ 100—200 nm.Although the corresponding selected area diffraction patterns can be indexed by β-phase plus α '-martensite with orthorhombic crystal structure,the dark-field analyses failed to observe the a'-martensite.Such phenomenon was also found in deformed gum metals and explained by stress-induced diffusion scattering due to phonon softening. | J.Hernandez S.J.Li E.Martinez L.E.Murr X.M.Pan K.N.Amato X.Y.Cheng F.Yang C.A.Terrazas S.M.Gaytan Y.L.Hao R.Yang F.Medina R.B.Wicker | 2013 | Journal of Materials Science & Technology2013，29，11： | 8 |
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