高熵合金<strong>FeCoNiTi</strong>的微观组织演变和强韧化行为

doi:10.11901/1005.3093.2019.557

材料研究学报

2020, Vol. 34

Issue (7): 535-544 DOI: 10.11901/1005.3093.2019.557

研究论文

本期目录 | 过刊浏览

高熵合金FeCoNiTi的微观组织演变和强韧化行为

刘怡¹, 徐康¹, 涂坚¹^,²(

), 黄灿¹, 吴玮¹, 谭力¹, 张琰斌¹, 尹瑞森³, 周志明¹^,²

1.重庆理工大学材料科学与工程学院重庆 400054
2.重庆理工大学重庆市模具技术重点实验室重庆 400054
3.重庆大学航天航空学院重庆 400044

Microstructure Evolution and Strength-ductility Behavior of FeCoNiTi High-entropy Alloy

LIU Yi¹, XU Kang¹, TU Jian¹^,²(

), HUANG Can¹, WU Wei¹, TAN Li¹, ZHANG Yanbin¹, YIN Ruisen³, ZHOU Zhiming¹^,²

1.School of Materials Science and Engineering, Chongqing University of Technology, Chongqing 400054, China
2.Chongqing Municipal Key Laboratory of Institutions of Higher Education for Mould Technology, Chongqing University of Technology, Chongqing 400054, China
3.School of Aerospace Engineering, Chongqing University, Chongqing 400030, China

引用本文:

刘怡, 徐康, 涂坚, 黄灿, 吴玮, 谭力, 张琰斌, 尹瑞森, 周志明. 高熵合金FeCoNiTi的微观组织演变和强韧化行为[J]. 材料研究学报, 2020, 34(7): 535-544.
Yi LIU, Kang XU, Jian TU, Can HUANG, Wei WU, Li TAN, Yanbin ZHANG, Ruisen YIN, Zhiming ZHOU. Microstructure Evolution and Strength-ductility Behavior of FeCoNiTi High-entropy Alloy[J]. Chinese Journal of Materials Research, 2020, 34(7): 535-544.

全文: PDF(24234 KB) HTML

摘要:

使用热力学软件设计了一种新型双相高熵合金(FeCoNiTi)，利用真空电弧熔炼和热处理制备出FeCoNiTi高熵合金块体材料。表征结果表明，FeCoNiTi高熵合金由层状结构的Laves相和魏氏体板条FCC相组成。在室温下FeCoNiTi高熵合金具有良好的综合力学性能(抗压强度σ_b=2.08 GPa，压缩应变ε=20.3%)。高强度来自“硬”Laves相(层状结构)的强化，而“软”FCC相(魏氏体板条)中的位错滑移和变形孪晶提供塑性。

关键词 ：金属材料, 高熵合金, 强韧化, 双相组织, 魏氏体板条

Abstract：

A new type of dual-phase high-entropy alloy (FeCoNiTi) was designed by means of thermodynamic software and then block material of FeCoNiTi high-entropy alloy was prepared via vacuum arc smelting and then heat treatment. Characterization results demonstrate that the as-homogenized FeCoNiTi alloy presents dual-phase microstructure composed of the lamellar structure (hexagonal close packed (Laves) phase) and the Widmanstätten laths (face-centered cubic (FCC) phase). The FeCoNiTi alloy shows excellent comprehensive property at room temperature with compressive strength σ_b=2.08 GPa and compression strain ε=20.3%. The high strength can mainly be attributed to the hard Laves phase (lamellar structure) strengthening; while dislocation slip and deformation twin in the soft FCC phase (Widmanstätten laths) provide the ductility.

Key words： metallic materials high entropy alloy strength-ductility dual-phase widmanstätten laths

收稿日期: 2019-12-02

ZTFLH:

TG113.1

基金资助:重庆市基础与前沿研究计划(2017jcyjAX0381);重庆市教委科技研究项目(KJQN201801139);国家博士面上资助(2018M632250)

作者简介: 刘怡，女，1996年生，硕士生

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	刘怡
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	谭力
	张琰斌
	尹瑞森
	周志明
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https://www.cjmr.org/CN/10.11901/1005.3093.2019.557 或 https://www.cjmr.org/CN/Y2020/V34/I7/535

图1 FeCoNi和FeCoNiTi高熵合金的相组成随温度的变化

图2 呈枝晶结构FeCoNiTi高熵合金铸态金的相图和显示粗晶组织和魏氏体板条的均匀态组织结构金相图

图3 均匀态FeCoNiTi高熵合金的背散射衍射图

图4 背散射电子图、反极图、相图和XRD图谱

图5 两个代表性选区元素的分布

表1 层状结构(位置1和3)和魏氏体板条(位置2和4)的化学成分

图6 FeCoNiTi高熵合金的压缩应力-应变曲线和断口形貌

图7 形变FeCoNiTi高熵合金的不同放大倍数SEM照片

图8 FeCoNiTi高熵合金形变态的EBSD图像

表2 使用Miedema模型计算的二元等原子合金的混合焓、Fe，Co、Ni、Ti的原子半径以及价电子浓度以及杨氏模量

图9 FeCoNiTi高熵合金的微观组织演变

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