TiC对Fe43Ni35Co22中熵合金微观组织与性能的影响

来源期刊:中国有色金属学报优先出版20210825

论文作者:李睿锴 陈维平 王浩 陈强 曾大海 付志强

文章页码:145 - 155

关键词:中熵合金;机械合金化;放电等离子烧结;力学性能;软磁性能

Key words:medium-entropy alloys; mechanical alloying; spark plasma sintering; mechanical properties; soft magnetic properties

摘    要:本文系统研究了TiC含量对Fe43Ni35Co22中熵合金微观组织、力学性能以及磁性能的影响。添加5%和10%(摩尔分数)Ti至中熵合金Fe43Ni35Co22,通过原位自生反应形成TiC/Fe43Ni35Co22合金块体,制备方法为“机械合金化(MA)+放电等离子烧结(SPS)”。研究结果表明:经40h球磨后, Fe43Ni35Co22粉末相的组成为FCC主相+少量BCC,两种TiC/Fe43Ni35Co22粉末的相组成为BCC主相+FCC相。经SPS烧结后,Fe43Ni35Co22块体为单相FCC和少量的杂质;两种TiC/Fe43Ni35Co22块体均由FCC+TiC两相组成,其中FCC相呈现“微米晶+超细晶”构成的多尺度结构,且随着TiC含量的增加,超细晶区增多。性能上,TiC的添加大幅提高了Fe43Ni35Co22的压缩屈服强度和矫顽力,同时也导致了材料的塑性和饱和磁化强度的降低。Ti添加量为5%的TiC/Fe43Ni35Co22综合性能最优异,其压缩屈服强度为1352 MPa,压缩断裂应变为24.5%,矫顽力为12.4 Oe,饱和磁化强度为138.7 emu/g。

Abstract: This paper systematically studied the influence of TiC on the microstructure, mechanical and magnetic properties of Fe43Ni35Co22 medium-entropy alloy (MEA). Adding 5% or 10% (mole fraction) Ti to theFe43Ni35Co22 MEA, the bulk TiC/Fe43Ni35Co22composite was achieved via in-situ reaction, using the combination of mechanical alloying (MA) and spark plasma sintering (SPS). The results showed that after 40hof ball milling, Fe43Ni35Co22 MEA powder was composed of a major face-centered cubic (FCC) phase and a small amount of body-centered cubic (BCC) phase, and the two TiC/Fe43Ni35Co22 powders were composed of a primary BCC phase and an FCC phase. Following by SPS, the bulk Fe43Ni35Co22MEA showed a single FCC phase with a small amount of contamination, and the two bulk TiC/Fe43Ni35Co22 consisted of a primary FCC phase with some TiC. Note that the FCC phase in the two bulk TiC/Fe43Ni35Co22 exhibited a multi-scale structure consisting of micron grains and ultra-fine grains. In addition, the volume fraction of ultra-fine grains increased as the TiC increased. In terms of properties, the addition of TiC evidently improved the compressive yield strength and coercivity of Fe43Ni35Co22, there by leading to a decrease in the plasticity and magnetic saturation of the material simultaneously. The bulk TiC/Fe43Ni35Co22 with 5% Ti addition showed the best performance, in detail, showing a compressive yield strength of 1352 MPa and a compressive fracture strain of 24.5%, along with a coercivity of 12.4 Oe and a saturation magnetization of 138.7emu/g.

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