热压烧结(FeNiCoCr)100-x Al x (x=0、5)高熵合金的微观组织及力学性能

doi:10.11901/1005.3093.2021.383

材料研究学报

2022, Vol. 36

Issue (11): 871-880 DOI: 10.11901/1005.3093.2021.383

研究论文

本期目录 | 过刊浏览

热压烧结(FeNiCoCr)_100-_x Al _x (x=0、5)高熵合金的微观组织及力学性能

王沛锦¹^,², 艾桃桃¹^,²(

), 廖仲尼¹^,², 赵堃¹, 李文虎¹^,², 寇领江¹^,², 赵中国¹^,², 邹祥宇¹^,²

^1.陕西理工大学材料科学与工程学院汉中 723000
^2.陕西理工大学矿渣综合利用环保技术国家地方联合工程实验室汉中 723000

Microstructure and Mechanical Properties of High-entropy Alloys (FeNiCoCr)_100-_x Al _x (x=0, 5) Prepared by Hot-pressing Sintering

WANG Peijin¹^,², AI Taotao¹^,²(

), LIAO Zhongni¹^,², ZHAO Kun¹, LI Wenhu¹^,², KOU Lingjiang¹^,², ZHAO Zhongguo¹^,², ZOU Xiangyu¹^,²

^1.School of Materials Science and Engineering, Shaanxi University of Technology, Hanzhong 723000, China
^2.National & Local Joint Engineering Laboratory for Environmental Protection Technology for Comprehensive Utilization of Slag, Shaanxi University of Technology, Hanzhong 723000, China

引用本文:

王沛锦, 艾桃桃, 廖仲尼, 赵堃, 李文虎, 寇领江, 赵中国, 邹祥宇. 热压烧结(FeNiCoCr)_100-_x Al _x (x=0、5)高熵合金的微观组织及力学性能[J]. 材料研究学报, 2022, 36(11): 871-880.
Peijin WANG, Taotao AI, Zhongni LIAO, Kun ZHAO, Wenhu LI, Lingjiang KOU, Zhongguo ZHAO, Xiangyu ZOU. Microstructure and Mechanical Properties of High-entropy Alloys (FeNiCoCr)_100-_x Al _x (x=0, 5) Prepared by Hot-pressing Sintering[J]. Chinese Journal of Materials Research, 2022, 36(11): 871-880.

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摘要:

采用低能球磨-热压烧结制备了(FeNiCoCr)_100-_x Al _x (x=0、5)高熵合金，并对其进行时效处理，研究了合金的组织结构与力学性能。结果表明：烧结态及时效态合金的微观组织均由FCC相和少量BCC相构成，其中FCC相中均存在孪晶，且未添加Al的合金中孪晶比例相对较高；添加Al的合金中BCC相较高，且时效处理后出现了大量小角度晶界。时效态FeNiCoCr合金具有最佳的综合性能，其压缩真屈服强度达545 MPa，弯曲强度和断裂韧性分别为1342±20 MPa和32.5±2.0 MPa·m^1/2，优异的力学性能归因于FCC相中退火孪晶的形成以及BCC相的析出。

关键词 ：金属材料, 高熵合金, 热压烧结, 微观组织, 力学性能, 孪晶

Abstract：

The high-entropy alloys (FeNiCoCr)_100-_x Al _x (x=0, 5) were prepared via a two-step process i.e., low-energy ball milling and then vacuum hot-pressing sintering, while the alloys were post-aged, afterwards, their microstructure and mechanical properties were assessed. The results show that the microstructure of both the as-sintered and the aged alloys composed of fcc-phase and a small amount of bcc phase, but twins presented in the fcc phase, and the proportion of twins for the alloy without Al was relatively high. The alloy with Al had relatively high bcc phase, and many small-angle grain boundaries appeared after aging treatment. The aged FeNiCoCr alloy has the best comprehensive performance, with a compressive true yield strength of 545 MPa. Moreover, the bending strength and the fracture toughness of the aged FeNiCoCr alloy reached 1342 MPa and 32.5 MPa·m^1/2. The excellent mechanical properties were attributed to the generation of annealing twins in the fcc-phase and the precipitation of the bcc-phase.

Key words： metallic materials high-entropy alloys hot-pressing sintering microstructure mechanical properties twins

收稿日期: 2021-06-26

ZTFLH:

TG146

基金资助:国家自然科学基金(51671116)

作者简介: 王沛锦，男，1998年生，硕士生

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https://www.cjmr.org/CN/10.11901/1005.3093.2021.383 或 https://www.cjmr.org/CN/Y2022/V36/I11/871

图1 时效前后 (FeNiCoCr)100-x Al x (x=0、5)高熵合金的XRD谱

图2 时效前后(FeNiCoCr)100-x Al x (x=0、5)高熵合金的EDS面扫描元素分布图

图3 时效前后(FeNiCoCr)100-x Al x (x=0、5)高熵合金的EBSD图(a1~d1)相位图，(a2~d2)反极图(IPF)图，(a3~d3)晶界和相界图(黑线代表大角度晶界，红线代表小角度晶界，蓝线代表相界)，(a4~d4)KAM图，(a5~d5)FCC相中晶界和孪晶界图(黑线代表相界，红线代表60°<111>孪晶界)

图4 烧结态FeNiCoCr高熵合金局部EBSD图(a)取向成像图；(b)图(a)对应的KAM图；(c)孪晶界取向差图

图5 时效前后(FeNiCoCr)100-x Al x (x=0、5)高熵合金的取向差角度分布图(a1~d1)和晶粒尺寸分布图(a2~d2)

图6 时效前后(FeNiCoCr)100-x Al x (x=0、5)高熵合金弯曲试样断口形貌

图7 时效前后(FeNiCoCr)100-x Al x (x=0、5)高熵合金的压缩真应力应变曲线

图8 时效前后(FeNiCoCr)100-x Al x (x=0、5)高熵合金的弯曲强度、断裂韧性和硬度

表1 热压烧结和电弧熔炼制备FeNiCoCr合金微观组织和力学性能的差异

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