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Microstructure and mechanical properties of partially amorphous Al_(85)Y_8Ni_5Co_2 plate produced by spray forming

机译:喷射成形制备的部分非晶Al_(85)Y_8Ni_5Co_2板的组织和力学性能

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摘要

A 12 mm thick Al_(85)Y_8Ni_5Co_2 plate was spray deposited on a 30 mm thick copper substrate pre-heated to 383 K. The deposit microstructure consists of an amorphous phase, 50-150 nm fcc-Al grains, 0.2-0.7 μm Al_2Y and Al_3Y intermetallic phases and some unidentified phases. The hardness of different microstruc-tural features and the compressive strength of the deposit, after extrusion at 723 K, were evaluated. The small size overspray particles as well as the deposit show a glass transition phenomenon. The total crystallization energy of the deposit is 121 J/g compared to 83.9 J/g for the small sized overspray powder, indicating its high metastability. A compressive strength of 925 MPa and a deformation strain of 9% were achieved for the deposit after extrusion. The novel microstructural features in the deposit are attributed to the "chilling effect" on highly undercooled or partially solidified large-size droplets during deposition onto the pre-heated substrate, and the rapid heat extraction thereof due to a close contact at the deposit/substrate interface.
机译:将12毫米厚的Al_(85)Y_8Ni_5Co_2板喷涂到30毫米厚的预热至383 K的铜基板上。该沉积物的微结构由非晶相,50-150 nm fcc-Al晶粒,0.2-0.7μmAl_2Y组成Al_3Y金属间化合物相和一些未知的相。在723 K挤压后,评估了不同微观结构特征的硬度和沉积物的抗压强度。小尺寸的过喷颗粒以及沉积物显示出玻璃化转变现象。沉积物的总结晶能为121 J / g,而小尺寸过喷粉末的总结晶能为83.9 J / g,表明其高亚稳性。挤出后的沉积物的抗压强度为925 MPa,变形应变为9%。沉积物中的新型微结构特征归因于在沉积到预热基底上的过程中对高度过冷或部分固化的大液滴的“冷却效应”,以及由于在沉积物/基底上的紧密接触而导致的快速吸热接口。

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  • 来源
    《Materials Science and Engineering》 |2010年第11期|2747-2758|共12页
  • 作者单位

    Institut fuer Werkstofftechnik, Universitaet Bremen, Badgasteiner Str. 3, D-28359 Bremen, Germany Metal Extraction & Forming Division, National Metallurgical Laboratory, Jamshedpur 831007, India;

    IFW Dresden, Institute for Complex Materials, P.O. Box 27 01 16,D-01171 Dresden, Germany;

    IFW Dresden, Institute for Complex Materials, P.O. Box 27 01 16,D-01171 Dresden, Germany;

    Institut fuer Festkoerperphysik, Universitaet Bremen, Otto-Hahn-Allee 1, D-28359 Bremen, Germany;

    Institut fuer Werkstofftechnik, Universitaet Bremen, Badgasteiner Str. 3, D-28359 Bremen, Germany;

    Institut fuer Werkstofftechnik, Universitaet Bremen, Badgasteiner Str. 3, D-28359 Bremen, Germany;

    IFW Dresden, Institute for Complex Materials, P.O. Box 27 01 16,D-01171 Dresden, Germany TU Dresden, Institute of Materials Science, D-01062 Dresden, Germany;

    Institut fuer Festkoerperphysik, Universitaet Bremen, Otto-Hahn-Allee 1, D-28359 Bremen, Germany;

    Institut fuer Werkstofftechnik, Universitaet Bremen, Badgasteiner Str. 3, D-28359 Bremen, Germany;

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  • 原文格式 PDF
  • 正文语种 eng
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  • 关键词

    spray deposition; bulk amorphous materials; Al-alloys; hardness; compressive strength;

    机译:喷雾沉积大块无定形材料;铝合金;硬度;抗压强度;

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