Precipitation behavior of Nb-Si-based in-situ composite manufactured by laser directed energy deposition
نویسندگان
چکیده
Understanding precipitation behaviors of laser directed energy deposition (L-DED) Nb-Si-based in-situ composite is significant to tailor the microstructure and performances. Here, FCC-Ti α-Nb5Si3 precipitates are formed in Nb-based solid solution(Nbss) as-built Nb-24Ti-15Si alloy, orientation relationships (ORs) between Nbss have been determined with coherent interfaces among them. With Zr or (Zr+Cr) addition, only γ-Nb5Si3 precipitate Nbss. The ORs [12¯16]γ//[011]Nbss (101¯0)γ//(01¯1)Nbss semi-coherent interface Nb-24Ti-15Si-2Zr while [0001]γ//[111]Nbss (011¯0)γ//(11¯0)Nbss appear Nb-24Ti-15Si-2Zr-5Cr alloy near interface. supersaturation alloying elements during near-rapid solidfication L-DED supplies chemical driving force thermal cycles process provide for formation precipitates.
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ژورنال
عنوان ژورنال: Scripta Materialia
سال: 2022
ISSN: ['1359-6462', '1872-8456']
DOI: https://doi.org/10.1016/j.scriptamat.2021.114288