粉末冶金(FeNiMnAlx)50Cu50中熵合金的微观组织与力学性能

doi:10.11868/j.issn.1001-4381.2021.000919

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摘要

对物理法制备的再生铜合金粉末进一步合金化，通过机械合金化（MA）结合放电等离子烧结（SPS）的方法制备了（Fe₄₀Ni₄₀Mn₂₀）₅₀Cu₅₀，（Fe₃₈Ni₃₈Mn₁₉Al₅）₅₀Cu₅₀，（Fe₃₆Ni₃₆Mn₁₈Al₁₀）₅₀Cu₅₀和（Fe₃₂Ni₃₂Mn₁₆Al₂₀）₅₀Cu₅₀四种中熵合金块体，并研究了Al元素的含量对中熵合金微观组织与力学性能的影响。结果表明：在高能球磨60 h之后合金粉末完成合金化，四种中熵合金粉末均形成单一FCC相的过饱和固溶体且有微量WC杂质。经SPS烧结后，（Fe₄₀Ni₄₀Mn₂₀）₅₀Cu₅₀，（Fe₃₈Ni₃₈Mn₁₉Al₅）₅₀Cu₅₀和（Fe₃₆Ni₃₆Mn₁₈Al₁₀）₅₀Cu₅₀形成了由富Cu的FCC1相和富Fe-Ni的FCC2相组成的双相FCC结构，并具有超细晶+微米晶的多尺度结构；而（Fe₃₂Ni₃₂Mn₁₆Al₂₀）₅₀Cu₅₀由富Cu的FCC主相和少量富Fe-Mn的FCC2相及富Ni-Al的BCC相（B2）组成。随着Al含量的提高，四种中熵合金的塑性逐渐降低，而强度和硬度逐渐提高。（Fe₄₀Ni₄₀Mn₂₀）₅₀Cu₅₀合金的压缩屈服强度、抗压强度和维氏硬度分别为878 MPa，1257 MPa和248.5HV。与（Fe₄₀Ni₄₀Mn₂₀）₅₀Cu₅₀相比，（Fe₃₂Ni₃₂Mn₁₆Al₂₀）₅₀Cu₅₀的压缩屈服强度和硬度分别提高了50.1%和50.4%，断裂应变由19.55%下降至8.31%。

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	陈维平
	陈焕达
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	付志强

关键词 ：中熵合金, 再生铜, 机械合金化, 放电等离子烧结, 微观组织, 力学性能

Abstract：

The recycled copper alloy powders prepared by physical method were further alloyed, and therefore four medium entropy alloys (MEAs), (Fe₄₀Ni₄₀Mn₂₀)₅₀Cu₅₀, (Fe₃₈Ni₃₈Mn₁₉Al₅)₅₀Cu₅₀, (Fe₃₆Ni₃₆Mn₁₈Al₁₀)₅₀Cu₅₀ and (Fe₃₂Ni₃₂Mn₁₆Al₂₀)₅₀Cu₅₀were successfully prepared via mechanical alloying (MA) and spark plasma sintering (SPS). The influence of Al content on the microstructure and mechanical properties of the MEAs were systematically studied. Following 60 h of MA, the mechanical alloyed powders of the four MEAs consist of a primary supersaturated FCC solid solution along with a trace amount of WC contaminants. Following SPS, the (Fe₄₀Ni₄₀Mn₂₀)₅₀Cu₅₀, (Fe₃₈Ni₃₈Mn₁₉Al₅)₅₀Cu₅₀ and (Fe₃₆Ni₃₆Mn₁₈Al₁₀)₅₀Cu₅₀ show a dual-phase structure consisting of a Cu-rich phase (FCC1) and a Fe-Ni-rich phase (FCC2), displaying a multiscale grain structure of ultrafine grains and micron grains. However, the (Fe₃₂Ni₃₂Mn₁₆Al₂₀)₅₀Cu₅₀ alloy shows a primary Cu-rich phase (FCC1) with a small amount of Fe-Mn rich phase (FCC2) and Ni-Al rich B2 phase. The plasticity of the four MEAs is gradually decreased, while the strength and hardness are gradually increased with the increase of Al content. The compressive yield strength, compressive strength and Vickers hardness of (Fe₄₀Ni₄₀Mn₂₀)₅₀Cu₅₀ MEAs are 878 MPa, 1257 MPa and 248.5HV, respectively. Compared with (Fe₄₀Ni₄₀Mn₂₀)₅₀Cu₅₀, the compressive yield strength and hardness of (Fe₃₂Ni₃₂Mn₁₆Al₂₀)₅₀Cu₅₀ are increased by 50.1% and 50.4%, respectively, whereas the fracture strain is decreased from 19.55% to 8.31%.

Key words： medium entropy alloy recycled copper mechanical alloying spark plasma sintering microstructure mechanical property

收稿日期: 2021-09-17 出版日期: 2022-10-24

中图分类号:

TG135

基金资助:广东省基础与应用基础研究基金项目(2020A1515111104)

通讯作者: 付志强 E-mail: zhiqiangfu2019@scut.edu.cn

作者简介: 付志强(1986—), 男, 博导, 博士, 研究方向: 新型合金的设计、成形加工、力学行为与极端环境服役行为, 联系地址: 广州市天河区华南理工大学38号楼(510641), E-mail: zhiqiangfu2019@scut.edu.cn

引用本文:

陈维平, 陈焕达, 褚晨亮, 付志强. 粉末冶金(FeNiMnAl_x)₅₀Cu₅₀中熵合金的微观组织与力学性能[J]. 材料工程, 2022, 50(10): 55-62.
Weiping CHEN, Huanda CHEN, Chenliang CHU, Zhiqiang FU. Microstructure and mechanical properties of (FeNiMnAl_x)₅₀Cu₅₀ medium entropy alloy fabricated by powder metallurgy. Journal of Materials Engineering, 2022, 50(10): 55-62.

链接本文:

http://jme.biam.ac.cn/CN/10.11868/j.issn.1001-4381.2021.000919 或 http://jme.biam.ac.cn/CN/Y2022/V50/I10/55

Fig.1 再生铜合金粉末粒径分布

Table 1 再生铜合金粉末的成分(质量分数/%)

Fig.2 再生铜合金粉末的SEM照片

Fig.3 四种中熵合金元素粉末不同球磨时间的XRD图谱
(a)MEA1;(b)MEA2;(c)MEA3;(d)MEA4

Fig.4 四种中熵合金块体的XRD图谱

Fig.5 四种中熵合金块体的SEM照片
(a)MEA1;(b)MEA2;(c)MEA3;(d)MEA4

Table 2 四种中熵合金EDS/BSE能谱分析结果

Fig.6 MEA2的TEM明场照片
(a)晶粒1(FCC1)和对应的衍射花样；(b)超细晶区和晶粒2(FCC2)对应的衍射花样

Table 3 两种中熵合金EDS/TEM能谱分析结果

Fig.7 MEA4的TEM明场照片
(a)微米晶区；(b)超细晶区

Fig.8 MEA4的HAADF STEM照片及元素面扫描

Fig.9 图 8中不同相的衍射斑点
(a)区域4；(b)区域5；(c)区域6

Fig.10 四种中熵合金室温压缩应力-应变曲线

Table 4 四种中熵合金室温下的力学性能

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