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The effect of heat treatment on the precipitation hardening in FeNiCoAlTa single crystals

机译:热处理对芬科特塔单晶沉淀硬化的影响

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摘要

The main goal of this work was to examine the effect of aging process on the precipitation behavior including phase morphology, chemical composition and degree of coherence in Fe-28Ni-17Co-11.5Al-2.5Ta single crystals. The nano-sized and coherent γ' precipitates were used for strengthening process. The particles were investigated with transmission and scanning electron microscopies along with high energy X-ray diffraction. The single crystalline material of [100] (001) orientation was subjected to three different heat treatments: slowly cooled, quenched and then annealed with various aging conditions. Aging at 973 K for short times results in coherent 2-6 nm-sized γ' precipitates and fully reversible superelastic strains while annealing at 973 K for 5 h and longer times leads to the precipitation of larger γ' particles formed together with β phase which significantly reduces the transformed martensite volume fraction.
机译:这项工作的主要目的是研究老化过程对沉淀行为的影响,包括Fe-28Ni-17Co-11.5Al-2.5TA单晶中的相位形态,化学成分和相干程度。纳米大小和相干γ'沉淀物用于加强工艺。用透射和扫描电子显微镜以及高能X射线衍射研究颗粒。 [100](001)取向的单晶材料进行三种不同的热处理:缓慢冷却,淬火,然后用各种老化条件退火。在973 k时,短时间的老化导致相干的2-6nm大小γ'沉淀物和完全可逆的超弹性菌株,同时在973k下退火5小时,更长的时间导致较大的γ'颗粒与β相形成的沉淀显着降低转化的马氏体体积分数。

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  • 来源
    《Materials Science and Engineering》 |2020年第may15期|139327.1-139327.7|共7页
  • 作者单位

    Institute of Metallurgy and Materials Science Polish Academy of Sciences Krakow Poland;

    Institute of Metallurgy and Materials Science Polish Academy of Sciences Krakow Poland;

    AGH University of Science and Technology Academic Centre for Materials and Nanotechnology Al. Mickiewicza 30 Krakow Poland;

    Institute of Metallurgy and Materials Science Polish Academy of Sciences Krakow Poland;

    Tomsk State University Siberian Physical Technical Institute 634050 Tomsk Russia;

    Institute of Materials Research Helmholtz-Zentrvm Geesmacht Max-Planck-Strasse 1 D-21502 Geesthacht Germany;

    The Henryk Niewodniczanski Istitute of Nuclear Physics Polish Academy of Sciences 152 Radzikowskiego St. 31-342 Krakow Poland;

    Institute of Metallurgy and Materials Science Polish Academy of Sciences Krakow Poland;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    Superelasticity; Single crystal; Iron-based shape memory alloys; Phase transformation; Precipitation;

    机译:超弹性;单晶;基于铁的形状记忆合金;相变;沉淀;

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