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首页> 外文期刊>Materials Science and Engineering >Microstructural sensitivity and deformation micro-mechanisms of a bimodal metastable β titanium Ti-7Mo-3Nb-3Cr-3Al alloy
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Microstructural sensitivity and deformation micro-mechanisms of a bimodal metastable β titanium Ti-7Mo-3Nb-3Cr-3Al alloy

机译：双峰型β钛TI-7MO-3NB-3Al-3Al合金的微结构敏感性和变形微机理

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摘要

The bimodal microstructure of a metastable β Ti-7Mo-3Nb-3Cr-3Al (Ti-7333) alloy was successfully tuned through various thermomechanical processing steps, to achieve strength and ductility combinations, in the range between 903 and 1443 MPa and 2.9 % and 17 %, respectively. The influence of the microstructural variables on the deformation micro-mechanisms and fracture mechanisms were further elucidated by the assistance of TEM and fractographic analysis. The results indicate that the strength of bimodal Ti-7333 is mainly governed by secondary α_S precipitation through the introduction of a high density of α/β interfaces that effectively block dislocation transmission, whereas ductility is tuned through the control of the primary α_P, rod-like α_r and retained β phases. Moreover, ductility can be extremely deteriorated if the formation of a continuous grain boundary α_(CGB) phase is not prevented. Plastic deformation of bimodal Ti-7333 is dominated by dislocation slip and tangling, whereas the microstructural sensitivity that accelerated at high strength level is originated from the deformation incompatibility between the fine acicular as and parent β. In addition, the {10-11}<-1012>_α micro-twinning of equiaxed α_P phases also contributes to improved ductility and coordinates deformation to an extent. The fractographic analysis revealed either fracture by microvoid coalescence or a mixture of intergranular fracture and microvoid coalescence, depending on thermomechanical condition. The mixed fracture mode results in a relatively flat crack propagation path and reduced ductility; whereas a tortuous crack propagation is obtained when the alloy solely undergoes fracture by microvoid coalescence.
机译：通过各种热机械加工步骤成功调整了亚稳态βTi-7MO-3NB-3C-3AL（TI-7333）合金的双峰组织，以实现强度和延展性组合，在903和1443MPa和2.9％之间的范围内分别为17％。通过TEM和Fretography分析，进一步阐明了微观结构变量对变形微机构和断裂机制的影响。结果表明，双峰TI-7333的强度主要通过引入高密度的α/β接口来控制次级α_s沉淀，从而通过控制偏移传递，而延展性通过初级α_P，杆 - 与α_R和保留的β相。此外，如果没有防止连续晶粒边界α_（CGB）相的形成，则延展性可以极大地恶化。双模TI-7333的塑性变形是通过位错滑滑和缠结的主导，而在高强度水平下加速的微观结构敏感性源自细锥和父母β之间的变形不相容性。另外，等轴α_P阶段的{10-11} <-1012>_α微孪晶也有助于改善延展性，并在一定程度上坐标变形。根据热机械条件，碎片分析通过微约体聚结或晶间骨折和微脂糖聚结的混合物显示出骨折。混合裂缝模式导致相对扁平的裂纹传播路径和降低的延展性;虽然当合金仅通过微型微型聚结时获得曲折的裂缝繁殖。

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  • 来源
    《Materials Science and Engineering》 |2021年第8期|141821.1-141821.15|共15页
  • 作者

    Nana Chen; Hongchao Kou; Zhihong Wu; Fengming Qiang; Ke Hua; Jiangkun Fan; Bin Tang; Jinshan Li; Jon M. Molina-Aldareguia;

  • 作者单位

    State Key Laboratory of Solidification Processing Northwestern Polytechnical University 710072 Xi'an PR China IMDEA Materiab Institute C/ Eric Kandel 2 28906 Getafe Madrid Spain E. T. S. de Ingenieros de Caminos Universidad Politicnica de Madrid 28040 Madrid Spain;

    State Key Laboratory of Solidification Processing Northwestern Polytechnical University 710072 Xi'an PR China;

    State Key Laboratory of Solidification Processing Northwestern Polytechnical University 710072 Xi'an PR China;

    State Key Laboratory of Solidification Processing Northwestern Polytechnical University 710072 Xi'an PR China;

    State Key Laboratory of Solidification Processing Northwestern Polytechnical University 710072 Xi'an PR China;

    State Key Laboratory of Solidification Processing Northwestern Polytechnical University 710072 Xi'an PR China;

    State Key Laboratory of Solidification Processing Northwestern Polytechnical University 710072 Xi'an PR China;

    State Key Laboratory of Solidification Processing Northwestern Polytechnical University 710072 Xi'an PR China;

    IMDEA Materiab Institute C/ Eric Kandel 2 28906 Getafe Madrid Spain;

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  • 正文语种 eng
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  • 关键词

    Metastable β titanium alloy; Bimodal microstructure; Tensile properties; Fractographic analysis; Deformation; micro-mechanisms;

    机译：亚稳β钛合金;双峰组织;拉伸性能;Fretography分析;形变;微机制;

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