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A real-time TEM study of the deformation mechanisms in β-Ti reinforced bulk metallic glass composites

机译：β-Ti加强块状金属玻璃复合材料变形机制的实时TEM研究

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摘要

The deformation mechanisms in a p-Ti reinforced Zr-based bulk metallic glass composite (BMGC) are studied by extracting submicron sized tensile coupons of the crystalline and amorphous phase in their monolithic and bilaminate composite forms and tensile testing them inside a TEM. Results show that the monolithic BCC crystalline phase and amorphous phase have high yield strains, owing to small length scale effects, but undergo negligible post-yield elongation before failure. However, the ductility of the bilaminate composite is significantly higher (～12.4%), provided the thickness of its amorphous portion is ＜ 100 nm. Real time videos, which are supplemented by molecular dynamics simulations, show that the negligible post yield elongation of the monolithic BCC crystalline phase is caused by planar slip on one of the {110} planes. However, the bilaminate composite form exhibits strain hardening, despite the occurrence of planar slip, as dislocations pile up at the impervious amorphous/crystalline interface, which in turn, activates slip on other {110} planes. Strain hardening in the crystalline phase ceases when a shear band nucleated in the amorphous phase penetrates the dendrite along one of the slip planes. These mechanisms are extended to explain the flow behavior of β-Ti reinforced BMGCs and strategies to improve the ductility are discussed.
机译：通过在其整体式和双晶体复合形式中提取亚微晶和无定形相的亚微晶和无定形相的亚微晶和无定形相的亚微米的拉伸试样和TEM在TEM内的拉伸试验来研究P-Ti加强Zr基体金属玻璃复合物（BMGC）中的变形机制。结果表明，由于小幅度效应小，整体BCC结晶相和无定形相具有高产量菌株，但在发生故障之前经历可忽略的后产率伸长率。然而，基亚酸盐复合材料的延展性显着较高（〜12.4％），条件是其无定形部分的厚度<100nm。通过分子动力学模拟补充的实时视频，表明整体式BCC结晶相的可忽略的产量伸长率是由{110}平面之一的平面滑动引起的。然而，尽管发生了平面滑动，但毕氨基酸盐复合形式表现出应变硬化，因为在不透水非晶/晶体界面上堆积的脱位堆积，这反过来，其在其他{110}平面上激活滑动。当在非晶相中核成核的剪切带沿着滑架中的一个剪切带渗透时，在结晶相的菌株暂停。展开了这些机制以解释β-Ti增强BMGC的流动性和改善延展性的策略。

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  • 来源
    《Materials Science and Engineering》 |2021年第22期|141427.1-141427.9|共9页
  • 作者

    Lin Tian; R. Lakshmi Narayan; Kun Zhou; Rita Babicheva; Upadrasta Ramamurty; Zhi-wei Shan;

  • 作者单位

    Center for Advancing Materials Performance from the Nanoscale (CAMP-Nano) Hysitron Applied Research Center in China (HARCC) State Key Laboratory for Mechanical Behavior of Materials Xi'an Jiaotong University Xi'an Shaanxi 710049 PR China Institute of Materials Physics University of Goettingen Niedersachsen 37077 Germany;

    Department of Materials Science and Engineering Indian Institute of Technology Delhi Hauz Khas New Delhi 110016 India;

    School of Mechanical & Aerospace Engineering Nanyang Technological University 50 Nanyang Avenue 639798 Singapore;

    School of Mechanical & Aerospace Engineering Nanyang Technological University 50 Nanyang Avenue 639798 Singapore;

    School of Mechanical & Aerospace Engineering Nanyang Technological University 50 Nanyang Avenue 639798 Singapore Institute of Materials Research and Engineering Agency for Science Technology and Research (A ☆STAR) Singapore 138634 Republic of Singapore;

    Center for Advancing Materials Performance from the Nanoscale (CAMP-Nano) Hysitron Applied Research Center in China (HARCC) State Key Laboratory for Mechanical Behavior of Materials Xi'an Jiaotong University Xi'an Shaanxi 710049 PR China;

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  • 正文语种 eng
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  • 关键词

    In situ mechanical testing; Dislocations; Plasticity; Composite; Amorphous alloys; bcc crystals;

    机译：原位机械测试;脱臼;可塑性;合成的;非晶合金;BCC水晶;

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