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首页> 外文期刊>Materials Science and Engineering >Effects of in situ formation of TiB_2 particles on age hardening behavior of Cu-1 wt% Ti-1 wt% TiB_2
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Effects of in situ formation of TiB_2 particles on age hardening behavior of Cu-1 wt% Ti-1 wt% TiB_2

机译：TiB_2原位形成对Cu-1 wt％Ti-1 wt％TiB_2时效硬化行为的影响

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摘要

Age hardenable Cu-1 wt% Ti-1 wt% TiB_2 composite was produced by adding boron powder to Cu-Ti melt. TiB_2 nano-particles were formed via in situ reaction between titanium and boron in the melt. This composite was aged in a temperature range of 300-550 ℃ for a period of 1-25 h. Then, the age hardening behavior of the composite was compared with that of the binary Cu-2 wt% Ti alloy. The microstructure of the composite was examined with a high-resolution transmission electron microscope (HRTEM). The results of this study showed that TiB_2 particles can act as a heterogeneous nucleation site for β'(Cu_4Ti) precipitates. Substantial increase in tensile and yield stress of composite (i.e. 63% and 186% respectively) occurred relative to the solution state, after ageing at 450 ℃ for 10 h. The maximum strengthening of the composite was associated with precipitation of metastable Cu_4Ti near the ultra hard TiB_2 particles within the matrix. However, the results of this research show that the mechanical properties of aged composites are in good agreement with those of binary Cu-2 wt% Ti alloy; the maximum values of the hardness and electrical conductivity of the composite (i.e. 258 HV, 28% IACS) and the binary Cu-2 wt% Ti alloy (i.e. 264 HV, 17% IACS) were obtained when solution treated samples were aged at 450 ℃ for 10 h and 15 h, respectively.
机译：通过将硼粉添加到Cu-Ti熔体中来生产可时效硬化的Cu-1 wt％Ti-1 wt％TiB_2复合材料。通过熔体中钛和硼之间的原位反应形成TiB_2纳米颗粒。该复合材料在300-550℃的温度范围内老化1-25小时。然后，将复合材料的时效硬化行为与二元Cu-2 wt％Ti合金的时效硬化行为进行了比较。用高分辨率透射电子显微镜（HRTEM）检查复合材料的微观结构。研究结果表明，TiB_2颗粒可作为β'（Cu_4Ti）沉淀的异质形核位点。在450℃下老化10h后，相对于固溶状态，复合材料的拉伸应力和屈服应力显着增加（分别为63％和186％）。复合材料的最大强化与基体内超硬TiB_2颗粒附近亚稳Cu_4Ti的沉淀有关。然而，这项研究的结果表明，时效复合材料的力学性能与二元Cu-2 wt％Ti合金的力学性能非常吻合。当溶液处理的样品在450℃时效时，获得了复合材料（即258 HV，28％IACS）和二元Cu-2 wt％Ti合金（即264 HV，17％IACS）的硬度和导电率的最大值分别保持10小时和15小时。

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  • 来源
    《Materials Science and Engineering》 |2013年第10期|16-22|共7页
  • 作者

    Mohsen Sobhani; Alireza Mirhabibi; Hossein Arabi; R.M.D. Brydson;

  • 作者单位

    Center of Excellence for High Strength Alloys Technology (CEHSAT), School of Metallurgy and Materials Engineering, Iran University of Science and Technology, IUST, Tehran 16845-118, Iran;

    Center of Excellence for Ceramic Materials in Energy and Environmental Applications(CECMEEA), IUST, Tehran 16845-118, Iran;

    Center of Excellence for High Strength Alloys Technology (CEHSAT), School of Metallurgy and Materials Engineering, Iran University of Science and Technology, IUST, Tehran 16845-118, Iran;

    Institute for Materials Research, University of Leeds, Leeds LS2 9JT, United Kingdom;

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  • 原文格式 PDF
  • 正文语种 eng
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  • 关键词

    Cu-Ti; Age hardening; Composite; TiB_2; In situ;

    机译：铜钛;时效硬化;综合;TiB_2;原位;

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