Investigation on the microstructure and mechanical behaviors of a laser formed Nb-Ti-Al alloy
Shi, Zhiwu1; Liu, Jinlai2; Wei, Hua3; Zhang, Hongyu2; Sun, Xiaofeng2; Zheng, Qi2
Corresponding AuthorShi, Zhiwu( ; Zheng, Qi(
AbstractNb-Ti-Al alloys have attracted much attention as a potential candidate for high-temperature structural applications beyond the scope of Ni-based superalloys. Previously, Nb-Ti-Al alloys were prepared by arc-melting or hot-pressing. In this study, laser forming of the Nb-23Ti-15Al alloy is explored, and the microstructure and mechanical behaviors are systematically investigated. The results indicate that the nearly defectless Nb-Ti-Al alloy with fine dendrites could be obtained through laser forming. Three phases, beta, delta and Ti(O,C), present in the alloy, and the beta/delta matrix displays a columnar microstructure. Moreover, the Ti(O,C) phase, a solid-solution of TiO or TiC, appears in the alloy. Ti(O,C) is formed due to the introduction of the O and C from the elemental powder, which has a face-centered cubic (FCC) structure and a moderate lattice parameter between that of TiO and TiC. Two morphologies of Ti(O,C), large cobblestone-like particles and small dispersive particles, are observed in the alloy. Forbidden reflections of delta phase occur due to double diffraction and slight superlattice reflections of beta phase arise. Furthermore, refined beta/delta phases and dispersed small Ti(O,C) result in higher microhardness and fracture toughness. In brief, our results indicate that laser forming is a potential method for manufacturing Nb-Ti-Al alloys with prominent properties.
KeywordLaser forming Nb-Ti-Al alloy Microstructure Ti(O,C) Double diffraction Mechanical behavior
Funding OrganizationNNSF of China
Indexed BySCI
Funding ProjectNNSF of China[51601192] ; NNSF of China[51671189]
WOS Research AreaMaterials Science ; Metallurgy & Metallurgical Engineering
WOS SubjectMaterials Science, Multidisciplinary ; Metallurgy & Metallurgical Engineering ; Materials Science, Characterization & Testing
WOS IDWOS:000539353900023
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Cited Times:7[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Corresponding AuthorShi, Zhiwu; Zheng, Qi
Affiliation1.AECC Commercial Aircraft Engine Co Ltd, Dept Mat Sci & Mfg Proc, Shanghai 200241, Peoples R China
2.Chinese Acad Sci, Inst Met Res, Superalloys Div, 72 Wenhua Rd, Shenyang 110016, Peoples R China
3.Zhejiang Univ, Coll Civil Engn & Architecture, Hangzhou 310058, Peoples R China
Recommended Citation
GB/T 7714
Shi, Zhiwu,Liu, Jinlai,Wei, Hua,et al. Investigation on the microstructure and mechanical behaviors of a laser formed Nb-Ti-Al alloy[J]. MATERIALS CHARACTERIZATION,2020,162:8.
APA Shi, Zhiwu,Liu, Jinlai,Wei, Hua,Zhang, Hongyu,Sun, Xiaofeng,&Zheng, Qi.(2020).Investigation on the microstructure and mechanical behaviors of a laser formed Nb-Ti-Al alloy.MATERIALS CHARACTERIZATION,162,8.
MLA Shi, Zhiwu,et al."Investigation on the microstructure and mechanical behaviors of a laser formed Nb-Ti-Al alloy".MATERIALS CHARACTERIZATION 162(2020):8.
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