Effect of Ge addition on microstructural evolution and mechanical properties of quinary Nb-16Si-22Ti-2Al-2Cr alloy

被引：4
作者：
Li, Zhaobo [1 ]
Luo, Liangshun [1 ]
Wang, Binbin [1 ]
Su, Baoxian [1 ]
Luo, Lei [2 ]
Wang, Liang [1 ]
Su, Yanqing [1 ]
Guo, Jingjie [1 ]
Fu, Hengzhi [1 ]
机构：
[1] Harbin Inst Technol, Sch Mat Sci & Engn, Natl Key Lab Precis Hot Proc Met, Harbin 150001, Peoples R China
[2] Nanjing Univ Aeronaut & Astronaut, Coll Mat Sci & Technol, Nanjing 210016, Peoples R China
来源：
INTERNATIONAL JOURNAL OF REFRACTORY METALS & HARD MATERIALS | 2023年 / 116卷
基金：
中国国家自然科学基金;
关键词：
Microstructural evolution; Fracture toughness; Elastic modulus; High-temperature compression strength; TEMPERATURE FRACTURE-TOUGHNESS; NB-MO-SI; HOT COMPRESSION; PHASE; TI; BEHAVIOR; STRENGTH; TRANSFORMATION; DEFORMATION; STABILITY;
D O I：
10.1016/j.ijrmhm.2023.106327
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
In this study, the effect of Ge addition on microstructural evolution and mechanical properties of hypereutectic Nb-16Si-22Ti-2Al-2Cr (at.%) alloy was explored in detail. The microstructural evolution of these alloys containing Ge was characterized by scanning electron microscopy (SEM), electron backscatter diffraction (EBSD), transmission electron microscopy (TEM). The mechanical properties including room-temperature fracture toughness and high-temperature compression strength were measured. Only Nbss and & beta;-Nb5Si3 were observed in all Ge-added alloys, which indicated that Ge intensively promoted the formation of & beta;-Nb5Si3 and restrained the formation of Nb3Si. Moreover, the volume fraction of & beta;-Nb5Si3 increased with Ge addition. Ge could improve the fracture toughness of Nb-16Si-22Ti-2Al-2Cr alloy. 1Ge (Nb-16Si-22Ti-2Al-2Cr-1Ge) alloy exhibited the max KQ of 18.47 MPa & BULL;m1/2. All alloys with added Ge, except 9Ge alloy, showed the higher toughness than that of Nb-16Si22Ti-2Al-2Cr alloy, owing to the presence of chaotic eutectics of Nbss/& beta;-Nb5Si3. In addition, Ge could not only improve the elastic modulus and nanohardness of constituent phases, but also elevate the high-temperature compression strength of the alloys. Moreover, some orientation relationships between Nbss and Nb5Si3 before and after high-temperature deformation were observed by EBSD method.
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页数：16
相关论文
共 60 条
[21]   Ultrahigh-temperature NbSS/Nb5Si3 fully-lamellar microstructure developed by directional solidification in OFZ furnace [J].
Li, Yulong ;
Miura, Seiji ;
Ohsasa, Kenichi ;
Ma, Chaoli ;
Zhang, Hu .
INTERMETALLICS, 2011, 19 (04) :460-469
[22]  
Li Z., 2023, Mater. Sci. Eng. A
[23]   Study of the effect of Ti and Ge in the microstructure of Nb-24Ti-18Si-5Ge in situ composite [J].
Li, Zifu ;
Tsakiropoulos, Panos .
INTERMETALLICS, 2011, 19 (09) :1291-1297
[24]   Study of the effects of Ge addition on the microstructure of Nb-18Si in situ composites [J].
Li Zifu ;
Tsakiropoulos, Panos .
INTERMETALLICS, 2010, 18 (05) :1072-1078
[25]   Failure mode transition of Nb phase from cleavage to dimple/tear in Nb-16Si-based alloys prepared via spark plasma sintering [J].
Liu, W. ;
Sha, J. B. .
MATERIALS & DESIGN, 2016, 111 :301-311
[26]   Microstructure and mechanical properties of Nb/Nb5Si3 in situ composites in Nb-Mo-Si and Nb-W-Si systems [J].
Ma, CL ;
Li, JG ;
Tan, Y ;
Tanaka, R ;
Hanada, S .
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING, 2004, 386 (1-2) :375-383
[27]   Composite alloying effects of V and Zr on the microstructures and properties of multi-elemental Nb?Si based ultrahigh temperature alloys [J].
Ma, Rui ;
Guo, Xiping .
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING, 2021, 813
[28]   Effects of Mo and Zr composite additions on the microstructure, mechanical properties and oxidation resistance of multi-elemental Nb-Si based ultrahigh temperature alloys [J].
Ma, Rui ;
Guo, Xiping .
JOURNAL OF ALLOYS AND COMPOUNDS, 2021, 870
[29]   Influence of molybdenum contents on the microstructure, mechanical properties and oxidation behavior of multi-elemental Nb - Si based ultrahigh temperature alloys [J].
Ma, Rui ;
Guo, Xiping .
INTERMETALLICS, 2021, 129 (129)
[30]   Eutectoid decomposition of βNb5Si3 →αNb5Si3 + Nbss in Nbss/Nb5Si3 in-situ composites revealed by electron microscopy [J].
Ma, Xiao ;
Guo, Xiping ;
Fu, Maosen .
MATERIALS CHARACTERIZATION, 2022, 191
123456