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首页> 外文期刊>Materials Science and Engineering >Cuboid-like nanostructure strengthened equiatomic Ti-Zr-Nb-Ta medium entropy alloy
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Cuboid-like nanostructure strengthened equiatomic Ti-Zr-Nb-Ta medium entropy alloy

机译：等级纳米结构强化秤Ti-Zr-Nb-Ta中等熵合金

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摘要

This study investigates the effect of annealing treatment on the phase transformation and mechanical properties of the equiatomic TiZrNbTa MEA from room temperature to 1200 °C. After annealing at 1200 °C for 24h, the single solid-solution body-centred cubic (BCC) phase in the as-cast Ta_(25)Zr_(25)Nb_(25)Ti_(25) transformed into an extremely high number density (～10~3/μm~2) of Ta-Nb-rich BCC nanocuboidal phase (28 ± 10 nm square, BCC1) and a nanostrip-like Zr-rich BCC phase (3 ± 2 nm thick, BCC2). The phase separation from BCC to BCC1 and BCC2 arises from two primary reasons: (ⅰ) the high positive mixing enthalpy of both Ta-Zr and Nb-Zr (strong tendency to separation between each pair), and (ⅱ) the 3-4 orders of magnitude higher mobility of Zr than Ta, Nb and Ti in these MEAs (kinetically driven). Detailed CALPHAD simulations of phase formation in this MEA agreed with experiments and provided insightful phase transformation details. The calculated diffusion distance of Zr (～4.1 nm) from the CALPHAD data corresponds to the measured Zr-rich nanostrip thickness (3 ± 2 nm). The nanocuboidal BCC1-BCC2 structure exhibited 112<111>-type of twinning deformation under compression at room temperature. The Ta_(25)Zr_(25)Nb_(25)Ti_(25) MEA retained yield strength of ～410 MPa at 1000 °C and ～210 MPa at 1200 °C. The phase transformation during cooling after annealing and the microstructural evolution during compression at temperatures from 600 °C to 1200 °C were characterized and discussed in detail.
机译：本研究研究了退火处理对从室温至1200℃的阶段Tizrnbta Mea的相变和力学性能的影响。在1200℃下退火24小时后，在AS浇注TA_（25）Zr_（25）中的单个固溶体为中心的立方（BCC）相位，Nb_（25）Ti_（25）转换成极高的数密度（〜10〜3 /μm〜2）TA-NB富含BCC纳米骨相（28±10nm Square，BCC1）和纳米氧化物样Zr的BCC相（3±2nm厚，Bcc2）。从BCC到BCC1和BCC2的相分离产生的主要原因：（Ⅰ）TA-ZR和NB-ZR的高正极混合焓（每对之间的分离的强趋势），（Ⅱ）3-4这些测量中的Zr的数量级比Ta，Nb和Ti更高的次数（动力学上驱动）。详细的CALPHAD模拟此MEA在此MEA中同意实验并提供了洞察力相变细节。 Zr（〜4.1nm）与藻氏数据的计算扩散距离对应于测量的富含型富型纳米薄荷厚度（3±2nm）。纳米骨质BCC1-BCC2结构在室温下在压缩下表现出112 <1111型的孪晶变形。 Ta_（25）Zr_（25）Nb_（25）Ti_（25）MEA在1200℃下在1000℃和〜210MPa下保留〜410MPa的屈服强度。在退火后冷却过程中的相变性和在600℃至1200℃的温度下的压缩期间的微观结构演化的特征和详细讨论。

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  • 来源
    《Materials Science and Engineering》 |2020年第4期|140169.1-140169.12|共12页
  • 作者

    V.T. Nguyen; M. Qian; Z. Shi; X.Q. Tran; D.M. Fabijanic; J. Joseph; D.D. Qu; S. Matsumura; C. Zhang; F. Zhang; J. Zou;

  • 作者单位

    School of Mechanical and Mining Engineering The University of Queensland Brisbane Queensland 4072 Australia;

    Centre of Additive Manufacturing School of Engineering RMIT University Melbourne Victoria 3000 Australia;

    School of Mechanical and Mining Engineering The University of Queensland Brisbane Queensland 4072 Australia;

    Department of Applied Quantum Physics and Nuclear Engineering Kyushu University Fukuoka 819-0395 Japan;

    Institute for Frontier Materials Deakin University Waurn Ponds 3216 Australia;

    Institute for Frontier Materials Deakin University Waurn Ponds 3216 Australia;

    School of Mechanical and Mining Engineering The University of Queensland Brisbane Queensland 4072 Australia;

    Department of Applied Quantum Physics and Nuclear Engineering Kyushu University Fukuoka 819-0395 Japan;

    CompuTherm LLC 8401 Greenway Blvd. Suite 248 Middleton WI 53562 USA;

    CompuTherm LLC 8401 Greenway Blvd. Suite 248 Middleton WI 53562 USA;

    School of Mechanical and Mining Engineering The University of Queensland Brisbane Queensland 4072 Australia Centre of Microscopy and Microanalysis The University of Queensland Brisbane Queensland 4072 Australia;

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  • 正文语种 eng
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  • 关键词

    Tantalum; Zirconium; Medium entropy alloys (MEAs); High entropy alloys (HEAs); Nanocuboidal; Mechanical properties;

    机译：钽;锆;中等熵合金（MEAS）;高熵合金（HEAS）;纳米柔毛;机械性能;

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