Al含量对CrFeNiAlxSi系高熵合金性能的影响

doi:10.11901/1005.3093.2020.402

材料研究学报

2021, Vol. 35

Issue (9): 712-720 DOI: 10.11901/1005.3093.2020.402

研究论文

本期目录 | 过刊浏览

Al含量对CrFeNiAl_xSi系高熵合金性能的影响

李刚¹^,²(

), 温影¹, 于中民¹, 刘囝¹, 熊梓连¹

^1.辽宁工程技术大学矿业学院阜新 123000
^2.营口理工学院营口 115000

Effect of Al Content on Properties of CrFeNiAl_xSi High Entropy Alloy

LI Gang¹^,²(

), WEN Ying¹, YU Zhongmin¹, LIU Jian¹, XIONG Zilian¹

^1.College of Mines, Liaoning Technical University, Fuxin, 123000, China
^2.Yingkou Institute of Technology, Yingkou 115000, China

引用本文:

李刚, 温影, 于中民, 刘囝, 熊梓连. Al含量对CrFeNiAl_xSi系高熵合金性能的影响[J]. 材料研究学报, 2021, 35(9): 712-720.
Gang LI, Ying WEN, Zhongmin YU, Jian LIU, Zilian XIONG. Effect of Al Content on Properties of CrFeNiAl_xSi High Entropy Alloy[J]. Chinese Journal of Materials Research, 2021, 35(9): 712-720.

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摘要:

选取与天然铬铁矿粉有效成分相近的Al、Cr、Fe、Ni、Si元素为高熵合金成分，采用激光烧结技术制备CrFeNiAl_xSi系高熵合金，研究了Al含量对CrFeNiAl_xSi系高熵合金的物相结构、显微组织、密度和孔隙率、显微硬度、耐磨和抗高温氧化性能的影响。结果表明：CrFeNiAl_xSi(x=0.2、0.4、0.6、0.8、1.0)系高熵合金由BCC+FCC相构成，随着Al含量的提高FCC相减少；x=0.6的合金硬度最高，为813.3HV；合金的密度降低孔隙率提高，x=0.2的合金密度最大，为4.21 g·cm^-³，孔隙率最低，为26.46%；x=0.6的合金耐磨性能最佳，磨损率为69.50 mg·cm^-²；随着Al含量的提高，合金的抗高温氧化性能明显提高。

关键词 ：金属材料, 高熵合金, 相结构, 硬度, 抗高温氧化

Abstract：

CrFeNiAl_xSi high entropy alloys were prepared via laser sintering with Al, Cr, Fe, Ni, Si and natural ferrochrome ore powder as raw materials. The effect of Al content on the phase structure, microstructure, density and porosity, microhardness, wear resistance and high temperature oxidation resistance of CrFeNiAl_xSi high entropy alloys were investigated. The results show that CrFeNiAl_xSi (x=0.2, 0.4, 0.6, 0.8, 1.0) high-entropy alloys composed of BCC+FCC phase. With the increase of Al content, the amount of FCC phase decreases gradually; when x=0.6, the hardness of the alloy reaches 813.3HV and the density of the alloy decreases and the porosity increases; when x=0.2, the density of the alloy is 4.21 g·cm^-³ and the porosity is 26.46%; whilst when x=0.6, the wear resistance of the alloy is the best with wear rate of 69.50 mg·cm^-²; Furthermore, the high temperature oxidation resistance of the alloy was obviously improved with the increasing Al-content.

Key words： metallic materials high entropy-alloy phase structure hardness high temperature oxidation resistance

收稿日期: 2020-09-27

ZTFLH:

TG113

基金资助:国家自然科学基金(51805235);营口理工学院创新团队支持计划(TD202001);营口理工学院高层次人才科研启动项目(YJRC202014)

作者简介: 李刚，男，1969年生，教授

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https://www.cjmr.org/CN/10.11901/1005.3093.2020.402 或 https://www.cjmr.org/CN/Y2021/V35/I9/712

表1 实验用粉末材料及其参数(质量分数，%)

表2 合金元素的基本物理参数

表3 合金元素间的混合焓[19]

表4 CrFeNiAlxSi高熵合金的相稳定参数

图1 CrFeNiAlxSi系高熵合金的XRD谱

表5 CrFeNiAlxSi系高熵合金的相体积分数

图2 CrFeNiAlxSi系高熵合金的微观组织

图3 CrFeNiAlSi高熵合金的扫描电镜照片

表6 CrFeNiAlSi合金各区域元素含量(原子分数，%)

图4 CrFeNiAlxSi系高熵合金的密度和孔隙率

图5 CrFeNiAlxSi系高熵合金的显微硬度和磨损率

图6 CrFeNiAlxSi系高熵合金磨损的显微形貌

图7 单位质量CrFeNiAlxSi高熵合金在800℃氧化的增重曲线

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