(Fe0.33Co0.33Ni0.33)84 -x Cr8Mn8B x 高熵非晶合金薄带的结构特征及其晶化行为

doi:10.11900/0412.1961.2021.00100

金属学报

2022, Vol. 58

Issue (2): 215-224 DOI: 10.11900/0412.1961.2021.00100

研究论文

本期目录 | 过刊浏览

(Fe_0.33Co_0.33Ni_0.33)₈₄_-_x Cr₈Mn₈B _x 高熵非晶合金薄带的结构特征及其晶化行为

张金勇¹^,²(

), 赵聪聪¹, 吴宜谨¹, 陈长玖¹, 陈正¹, 沈宝龙¹(

)

^1.中国矿业大学材料与物理学院徐州 221116
^2.西北工业大学凝固技术国家重点实验室西安 710072

Structural Characteristic and Crystallization Behavior of the (Fe_0.33Co_0.33Ni_0.33)₈₄_-_x Cr₈Mn₈B _x High-Entropy-Amorphous Alloy Ribbons

ZHANG Jinyong¹^,²(

), ZHAO Congcong¹, WU Yijin¹, CHEN Changjiu¹, CHEN Zheng¹, SHEN Baolong¹(

)

^1.School of Materials and Physics, China University of Mining and Technology, Xuzhou 221116, China
^2.State Key Laboratory of Solidification Processing, Northwestern Polytechnical University, Xi'an 710072, China

引用本文:

张金勇, 赵聪聪, 吴宜谨, 陈长玖, 陈正, 沈宝龙. (Fe_0.33Co_0.33Ni_0.33)₈₄_-_x Cr₈Mn₈B _x 高熵非晶合金薄带的结构特征及其晶化行为[J]. 金属学报, 2022, 58(2): 215-224.
Jinyong ZHANG, Congcong ZHAO, Yijin WU, Changjiu CHEN, Zheng CHEN, Baolong SHEN. Structural Characteristic and Crystallization Behavior of the (Fe_0.33Co_0.33Ni_0.33)₈₄_-_x Cr₈Mn₈B _x High-Entropy-Amorphous Alloy Ribbons[J]. Acta Metall Sin, 2022, 58(2): 215-224.

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摘要:

基于前期的研究结果，降低Mn和Cr元素的含量，将2者的原子分数均固定在8%，设计出(Fe_0.33Co_0.33Ni_0.33)_{84 -}_x Cr₈Mn₈B _x (x = 10、11、13、15和18)合金(简称10B、11B、13B、15B和18B)，采用真空熔融甩带法制备出该系列合金的薄带。将合金薄带在不同温度下进行退火处理，通过XRD、DSC、TEM、SEM、万能拉伸试验机、OM、Vickers硬度计等研究了合金薄带的结构特征、晶化行为和力学性能。结果表明：11B合金薄带已完全形成非晶相(am)，11B~18B合金薄带加热时都有2个结晶转变放热峰，B元素的添加提高了该系列合金的非晶形成能力(GFA)和热稳定性。11B~18B合金薄带在不同温度退火，bcc相、fcc相和硼化物(M₂₃B₆)等1种或多种混合物析出，其结晶行为分别为：11B和13B，[am]→[am′ + bcc]→[am″ + bcc + fcc]→[bcc + fcc + M₂₃B₆]→[fcc + M₂₃B₆]；15B，[am]→[am′ + fcc + bcc]→[am″ + bcc + fcc + M₂₃B₆]→[bcc + fcc + M₂₃B₆]→[fcc + M₂₃B₆]；18B，[am]→[am′ + fcc]→[am″ + fcc + M₂₃B₆]→[fcc + M₂₃B₆] (其中，am′和am″分别为第1次和第2次结晶残余非晶相)。

关键词 ：高熵非晶合金薄带, 结构特征, 热诱导晶化行为, 相组成, 力学性能

Abstract：

The high-entropy-amorphous alloy (also called a pseudo-high-entropy alloy), as one of the categories of high-entropy alloys, is being developed as a new type of functional and structural high-strength material due to its advantages of high entropy and amorphousness. To further develop a new high-entropy-amorphous alloy, based on the results of previous studies, (Fe_0.33Co_0.33Ni_0.33)_{84 -}_x Cr₈Mn₈B _x (x = 10-18, atomic fraction, %) alloys were synthesized (hereafter, alloys 10B, 11B, 13B, 15B, and 18B). The ribbons with a thickness of 20-30 μm and a width of about 1.5 mm were produced by single-roller melt-spinning. The alloy ribbons were annealed at different temperatures and then characterized by XRD, DSC, TEM, SEM, OM, universal tensile testing machine, and Vickers hardness tester. The results show that the addition of B improves the glass-forming ability and thermal stability of these alloys. The ribbons are fully amorphous at the low B content of 11%. Two exotherms were observed based on the DSC curves for the 11B-18B as-spun ribbons. The crystallization behaviors of 11B-18B alloy ribbons are as follows during heating: 11B and 13B, [am]→[am′ + bcc]→[am″ + bcc + fcc]→[bcc + fcc + M₂₃B₆]→[fcc + M₂₃B₆]; 15B, [am]→[am′ + fcc + bcc]→[am″ + bcc + fcc + M₂₃B₆]→[bcc + fcc + M₂₃B₆]→[fcc+ M₂₃B₆]; and 18B, [am]→[am′ + fcc]→[am″ + fcc + M₂₃B₆]→[fcc + M₂₃B₆] (The am′ and am″ are the residual amorphous phases after the first and the second exotherms, respectively)

Key words： high-entropy-amorphous alloy ribbon structural characteristic heating-induced crystallization behavior phase composition mechanical property

收稿日期: 2021-03-03

ZTFLH:

TG139.8

基金资助:中央高校基本科研业务费专项资金项目(2018GF13)

作者简介: 沈宝龙，shenbaolong@cumt.edu.cn，主要从事高熵合金、非晶合金材料的研究张金勇，jyzhang@cumt.edu.cn，主要从事钛合金、高熵合金材料的研究
张金勇，男，1982年生，副教授，博士

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https://www.ams.org.cn/CN/10.11900/0412.1961.2021.00100 或 https://www.ams.org.cn/CN/Y2022/V58/I2/215

图1 10B~18B合金细棒和薄带的XRD谱

图2 11B合金薄带TEM明场像、SAED花样及HRTEM像

图3 11B~18B合金薄带的DSC曲线及晶化峰起始温度随B元素含量变化

图4 升温速率为0.17~0.67 K/s时11B~18B合金薄带的DSC曲线，及第1和第2放热峰的Kissinger常数分布

图5 11B、15B和18B合金薄带在不同温度退火1800 s后的XRD谱

图6 11B非晶合金薄带经725 K退火1800 s后的TEM像、SAED花样和HRTEM像

图7 15B非晶合金薄带经711 K退火1800 s后的TEM像、SAED花样和HRTEM像

图8 11B~15B合金薄带的相组成、Vickers硬度随退火温度的变化(退火1800 s)

图9 未经退火处理的11B合金薄带弯折180°后折痕处的SEM像及未经退火处理的10B~18B合金薄带的Vickers硬度随B元素含量的变化

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