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首页> 外文期刊>Materials Science and Engineering >Microstructure characterization, mechanical properties and toughening mechanism of TiB_2-containing conventional cast TiAl-based alloy
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Microstructure characterization, mechanical properties and toughening mechanism of TiB_2-containing conventional cast TiAl-based alloy

机译:含TiB_2的传统铸造TiAl基合金的显微组织表征,力学性能和增韧机理

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摘要

Effects of TiB_2 addition on microstructure and mechanical properties of Ti-48Al-2Cr-2Nb+(0.72,1.62) wt% TiB_2 alloys fabricated by the induction skull melting (ISM) process were investigated. Results showed that the TiB_2-induced microstructure was characterized by randomly orientated fully lamellar colonies and both the colony size and lamellae spacing were refined (100 μm and ~185 nm, respectively) by TiB_2 addition. The borides were identified to be TiB_2 with plate, needle and block morphologies, determined by different growth stages during solidification. At room temperature and 700 ℃, the TiB_2-containing alloys exhibit non-deteriorated fracture toughness and superior tensile properties than that of the as-cast and heat-treated matrix alloys. Furthermore, the fracture toughness anisotropy was eliminated due to the randomly orientated lamellar microstructure induced by TiB_2 addition. The fine TiB_2 particles with special morphology (plate and needle) and the easy-to-deform ligament bridges induced by the refined microstructure can account for the notable fracture toughness of the studied TiB_2-containing alloys. The main toughening mechanism was analyzed and discussed in light of the microstructure characterization, size and morphology of borides and the deformed ligament bridges.
机译:研究了TiB_2的添加对通过感应熔炼(ISM)工艺制备的Ti-48Al-2Cr-2Nb +(0.72,1.62)wt%TiB_2合金的组织和力学性能的影响。结果表明,TiB_2诱导的显微结构具有随机定向的完全层状菌落的特征,并且通过添加TiB_2可以改善菌落的大小和片层间距(分别为100μm和〜185 nm)。硼化物被鉴定为具有板状,针状和块状形态的TiB_2,由凝固过程中的不同生长阶段确定。在室温和700℃下,含TiB_2的合金比铸态和热处理的基体合金具有不劣化的断裂韧性和优异的拉伸性能。此外,由于添加TiB_2引起的随机取向的片状微观结构,消除了断裂韧性各向异性。具有特殊形态(板状和针状)的细TiB_2颗粒以及细化的微结构引起的易于变形的韧带桥可以解释所研究的含TiB_2合金的显着断裂韧性。根据硼化物和变形韧带桥的微观结构特征,尺寸和形态,分析和讨论了主要的增韧机理。

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  • 来源
    《Materials Science and Engineering》 |2015年第1期|8-19|共12页
  • 作者单位

    National Key Laboratory of Science and Technology on Precision Heat Processing of Metals, Harbin Institute of Technology, Harbin 150001, PR China;

    National Key Laboratory of Science and Technology on Precision Heat Processing of Metals, Harbin Institute of Technology, Harbin 150001, PR China;

    National Key Laboratory of Science and Technology on Precision Heat Processing of Metals, Harbin Institute of Technology, Harbin 150001, PR China;

    National Key Laboratory of Science and Technology on Precision Heat Processing of Metals, Harbin Institute of Technology, Harbin 150001, PR China;

    National Key Laboratory of Science and Technology on Precision Heat Processing of Metals, Harbin Institute of Technology, Harbin 150001, PR China;

    National Key Laboratory of Science and Technology on Precision Heat Processing of Metals, Harbin Institute of Technology, Harbin 150001, PR China;

    National Key Laboratory of Science and Technology on Precision Heat Processing of Metals, Harbin Institute of Technology, Harbin 150001, PR China;

    National Key Laboratory of Science and Technology on Precision Heat Processing of Metals, Harbin Institute of Technology, Harbin 150001, PR China;

    National Key Laboratory of Science and Technology on Precision Heat Processing of Metals, Harbin Institute of Technology, Harbin 150001, PR China;

    National Key Laboratory of Science and Technology on Precision Heat Processing of Metals, Harbin Institute of Technology, Harbin 150001, PR China;

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  • 正文语种 eng
  • 中图分类
  • 关键词

    Titanium aluminides; Microstructure; Crystal growth; Fracture toughness; Tensile property;

    机译:铝化钛;微观结构晶体生长;断裂韧性;拉伸性能;

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