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首页> 外文期刊>Materials Science and Engineering >Effects of microstructure on the evolution of dynamic damage of Fe_(50)Mn_(30)Co_(10)Cr_(10) high entropy alloy
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Effects of microstructure on the evolution of dynamic damage of Fe_(50)Mn_(30)Co_(10)Cr_(10) high entropy alloy

机译：微观结构对Fe_（50）Mn_（30）CO_（10）CR_（10）高熵合金的动态损伤演化的影响

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摘要

The Fe_(50)Mn_(30)Co_(10)Cr_(10) high-entropy alloy (HEA) was subjected to plate impact loading with a single-stage light gas gun and the Doppler pin system (DPS) was used to measure the velocity of free surface particles of the sample during loading. The effects of microstructure on the evolution of spallation of the Fe_(50)Mn_(30)Co_(10)Cr_(10) HEA were investigated by means of electron back scattered diffraction (EBSD), optical microscope (OM) and X-ray diffraction (XRD) techniques. The results showed that the voids are neither nucleated at the martensite (M)/ matrix interface nor nucleated in the M aggregated area (M area) with high impact resistance as predicted by impact dynamics, instead, voids nucleated inside the matrix phase with low impact resistance. The reason is that the lattice expansion during M transformation leads to the formation of compressive residual stress at the M/ matrix interface as well as M area and tensile residual stress in the matrix, which promoted the preferential nucleation of voids in the matrix. Void nucleation in the matrix was not random: the tri-junction of general high angle grain boundaries (HAGBs) and the grain boundaries of adjacent grains with a large difference in Taylor Factor (TF) value were prone to stress concentration under tensile loading, which were the priority position for void nucleation. The void nucleation was inhibited by twin boundary (TB) due to its stable structure and low energy. However, the intersections of HAGBs and termination TB are the possible position for void nucleation due to its high interface energy. The compressive residual stress at the M/matrix interface and inside of M area has a closure effect on the microcrack, which caused the microcrack avoided the M area and propagated in the matrix and finally stopped at the M/matrix interface.
机译：FE_（50）MN_（30）CO_（10）CR_（10）CR_（10）高熵合金（HEA）与单级轻气枪进行板冲击载荷，使用多普勒销系统（DPS）测量在装载过程中样品的自由表面颗粒的速度。通过电子背散射衍射（EBSD），光学显微镜（OM）和X射线研究了微观结构对Fe_（50）Mn_（30）CO_（10）CR_（10）HE HE Hea的脱模展开的影响。衍射（XRD）技术。结果表明，随着冲击动力学预测的，空隙在Martensite（M）/基质界面（M）/矩阵界面中也不核，而在Martensite（M）/基质界面中也没有核，而是通过冲击动力学预测的高抗冲击性，而是在基质相位内核心的空隙抵抗性。原因是M转化期间的晶格膨胀导致M / Matrix界面的压缩残余应力以及基质中的割区和拉伸残余应力，其促进了基质中的空隙的优先成核。基质中的空隙成核不是随机：一般大角晶界（HAGB）的三结和相邻颗粒的晶粒的晶界具有很大差异在拉伸载荷下的应力浓度，这是无效成核的优先位置。由于其稳定的结构和低能量，双边界（TB）抑制了空隙成核。然而，HAGBS和终止TB的交叉点是由于其高界面能量而导致的空隙成核的可能位置。 M / Matrix界面和M区域内部的压缩残余应力对微裂纹具有闭合效果，这导致微裂纹避免了M区域并在矩阵中传播，最后在M /矩阵界面处停止。

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  • 来源
    《Materials Science and Engineering》 |2021年第20期|140440.1-140440.9|共9页
  • 作者

    Yang Yang; Shuangjun Yang; Haimin Wang;

  • 作者单位

    School of Material Science and Engineering Central South University Changsha 410083 China Key Laboratory of Ministry of Education for Nonferrous Metal Materials Science and Engineering Central South University Changsha 410083 China;

    School of Material Science and Engineering Central South University Changsha 410083 China;

    School of Material Science and Engineering Central South University Changsha 410083 China;

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  • 正文语种 eng
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  • 关键词

    Spallation; Void nucleation; Martensite; Twin boundary; High entropy alloy;

    机译：介绍;无效成核;马氏体;双边界;高熵合金;

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