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首页> 外文期刊>Materials Science and Engineering >Formation of Ti_2AlN and TiB and its effect on mechanical properties of Ti46Al4Nb1Mo alloy by adding BN particles
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Formation of Ti_2AlN and TiB and its effect on mechanical properties of Ti46Al4Nb1Mo alloy by adding BN particles

机译：添加BN颗粒形成Ti_2AlN和TiB及其对Ti46Al4Nb1Mo合金力学性能的影响

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摘要

The synergistic effects of B and N on the microstructure evolution, mechanical properties and fracture behavior of Ti46Al4Nb1Mo alloy were investigated by adding BN particles. Ti46Al4Nb1Mo-xB-xN (x = 0, 0.4%, 0.8%, 1.2%, 1.6%, atomic percent, hereafter in at.%) alloys were prepared by vacuum arc melting. Compared with Ti46Al4Nb1Mo alloy, B2 phase disappeared and curvy TiB phase appeared at the interdendritic region in the Ti46Al4Nb1Mo-0.4B-0.4 N alloy. When 0.8% B and 0.8% N were added, Ti2AlN particles appeared in alpha(2)/gamma lamellar colonies, tiny TiB particles and a few curvy TiB phases formed both at lamellar boundaries and lamellar colonies. With further increasing B and N content, the volume fraction of Ti2AlN and tiny TiB phases increased, and some long TiB phases appeared in the Ti46Al4Nb1Mo-1.6B-1.6 N alloy. Ti2AlN and TiB phases formed by the reaction between Ti46Al4Nb1Mo alloy and BN particles. The different formation mechanism between Ti2Al and TiB was related to the different solid solubility of B and N in the Ti46Al4Nb1Mo alloy and solute redistribution during solidification process. When the content of B and N increased from 0 to 1.2%, the average lamellar colony size decreased from 358.4 mu m to 48.7 mu m, which resulted from synergistic effect of Ti2AlN and TiB. Compression results showed that the strength was improved from 1961 MPa to 2493 MPa without decreasing compressive strain. The fracture morphology showed Inter-granular and inter-lamellar fracture mode in the Ti46Al4Nb1Mo alloy, while the fracture morphology showed trans-lamellar mode in the reinforced composites. The second phase strengthening of Ti2AlN and TiB, grain boundary strengthening by refined alpha(2)/gamma lamellae, and elimination of B2 phase contributed to the improvement of strength.
机译：通过添加BN颗粒，研究了硼和氮对Ti46Al4Nb1Mo合金组织演变，力学性能和断裂行为的协同作用。通过真空电弧熔化制备Ti46Al4Nb1Mo-xB-xN（x = 0，0.4％，0.8％，1.2％，1.6％，原子百分比，此后为原子百分比）的合金。与Ti46Al4Nb1Mo合金相比，Ti46Al4Nb1Mo-0.4B-0.4 N合金的枝晶间区域B2相消失，弯曲的TiB相出现。当添加0.8％B和0.8％N时，Ti2AlN颗粒出现在α（2）/γ层状菌落中，微小的TiB颗粒和一些弯曲的TiB相在层状边界和层状菌落处均形成。随着B和N含量的进一步增加，Ti46Al4Nb1Mo-1.6B-1.6 N合金中Ti2AlN和微小TiB相的体积分数增加，并且出现了一些长的TiB相。 Ti46Al4Nb1Mo合金与BN颗粒之间的反应形成了Ti2AlN和TiB相。 Ti2Al和TiB之间形成机理的不同与B和N在Ti46Al4Nb1Mo合金中的固溶度不同以及凝固过程中的溶质再分布有关。当B和N的含量从0增加到1.2％时，由于Ti2AlN和TiB的协同作用，平均片状菌落尺寸从358.4μm减小到48.7μm。压缩结果表明，强度从1961 MPa提高到2493 MPa，而压缩应力却没有降低。 Ti46Al4Nb1Mo合金的断裂形态为晶间和层间断裂模式，而增强复合材料的断裂形态为跨层模式。 Ti2AlN和TiB的第二相强化，通过精制的alpha（2）/γ片晶强化晶界以及消除B2相有助于提高强度。

著录项

  • 来源
    《Materials Science and Engineering》 |2019年第22期|161-171|共11页
  • 作者

    Tan Yingmei; Chen Ruirun; Liu Yangli; Ding Hongsheng; Su Yanqing; Guo Jingjie; Fu Hengzhi;

  • 作者单位

    Harbin Inst Technol, Natl Key Lab Precis Hot Proc Met, Harbin 150001, Heilongjiang, Peoples R China;

    Harbin Inst Technol, Natl Key Lab Precis Hot Proc Met, Harbin 150001, Heilongjiang, Peoples R China|Harbin Inst Technol, State Key Lab Adv Welding & Joining, Harbin 150001, Heilongjiang, Peoples R China;

    Harbin Inst Technol, Natl Key Lab Precis Hot Proc Met, Harbin 150001, Heilongjiang, Peoples R China;

    Harbin Inst Technol, Natl Key Lab Precis Hot Proc Met, Harbin 150001, Heilongjiang, Peoples R China;

    Harbin Inst Technol, Natl Key Lab Precis Hot Proc Met, Harbin 150001, Heilongjiang, Peoples R China;

    Harbin Inst Technol, Natl Key Lab Precis Hot Proc Met, Harbin 150001, Heilongjiang, Peoples R China;

    Harbin Inst Technol, Natl Key Lab Precis Hot Proc Met, Harbin 150001, Heilongjiang, Peoples R China;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    TiAl; BN; Microstructure; Fracture behavior;

    机译：TiAl;BN;显微组织;断裂行为;

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