CrMoVNbFe<i><sub>x</sub></i>高熵合金微观组织结构与力学性能

doi:10.11901/1005.3093.2015.460

材料研究学报

2016, Vol. 30

Issue (8): 609-613 DOI: 10.11901/1005.3093.2015.460

本期目录 | 过刊浏览

CrMoVNbFe_x高熵合金微观组织结构与力学性能

王江, 黄维刚

四川大学材料科学与工程学院成都 610065

Microstructure and Mechanical Properties of CrMoVNbFe_x High-entropy Alloys

WANG Jiang, HUANG Weigang^*

College of Materials Science and Engineering, Sichuan University, Chengdu 610065, China

引用本文:

王江, 黄维刚. CrMoVNbFe_x高熵合金微观组织结构与力学性能[J]. 材料研究学报, 2016, 30(8): 609-613.
Jiang WANG, Weigang HUANG. Microstructure and Mechanical Properties of CrMoVNbFe_x High-entropy Alloys[J]. Chinese Journal of Materials Research, 2016, 30(8): 609-613.

全文: PDF(2679 KB) HTML

摘要:

通过XRD, SEM, EDS分析和显微硬度测试, 研究了Fe含量对CrMoVNbFe_x高熵合金铸态组织的相结构变化、微观组织和力学性能的影响。结果表明, 随Fe含量的增加, 合金相结构由单一的bcc结构固溶体逐步转化为bcc和σ两相结构。合金的铸态组织为典型树枝晶, Mo主要分布在枝晶内, Fe和Cr主要分布在枝晶间, 随Fe含量的增加, Nb在枝晶间的含量增加。随Fe含量的增加, 合金的组织显著细化, 而且显著提高合金的硬度, 最高硬度达到HV950。

关键词 ：金属材料, 高熵合金, 相结构, 微观组织, 力学性能

Abstract：

The effect of Fe content on the phase constituent, microstructure and mechanical properties of CrMoVNbFe_x high-entropy alloys were investigated by using of XRD, SEM, EDS and microhardness tester. The results reveal that CrMoVNbFe_x alloys exhibited as a solid solution of single bccphase without Fe, whereas bcc solid solution+ intermetallic σ phase was observed with the increase of Fe content. The as-cast alloys show a microstructure with typical casting dendrites. It was found that Mo mainly exist in the dendrite, Fe and Cr concentrated mainly in the interdendriticspace and the Nb content in the interdendriticspace was slightly higher than that in the dendrite. With the increasing Fe content, the microstructure of alloys is refined and the hardness is enhanced significantly and the maximum hardness value of the CrMoVNbFe_x high-entropy alloys reaches HV950.

Key words： metallic materials high-entropy alloy phase structure microstructure mechanical property

收稿日期: 2015-08-17

作者简介: 本文联系人: 黄维刚, 教授

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https://www.cjmr.org/CN/10.11901/1005.3093.2015.460 或 https://www.cjmr.org/CN/Y2016/V30/I8/609

图1 铸态CrMoVNbFex(x=0, 0.2, 0.4, 0.6, 0.8, 1.0)高熵合金的X射线衍射谱

表1 CrMoVNbFex高熵合金的△Smix、δ、△Hmix和VEC值

表2 各元素之间的结合焓

图2 铸态CrMoVNbFex高熵合金的背散射电子像

表3 铸态CrMoVNbFex (x=0, 0.2, 0.4, 0.6, 0.8, 1)合金系中不同显微组织区域的的化学成分

图3 不同Fe含量的CrMoVNbFex合金的硬度

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