Y对WTaCrVTi高熵合金的组织结构与力学性能的影响

陈时杰; 张世荣; 薛丽红; 严有为; 张五星

Y对WTaCrVTi高熵合金的组织结构与力学性能的影响

华中科技大学　材料科学与工程学院材料成形与模具技术国家重点实验室, 湖北武汉 430074

基金项目: 国家磁约束核聚变能发展研究专项(项目号2018YFE0306104)；材料成形与模具技术国家重点实验室开放课题研究基金(项目号P2023-024)

详细信息

通讯作者:
薛丽红，博士，副教授，硕士生导师，研究方向为功能/结构复合材料　E-mail: xuelh@hust.edu.cn

中图分类号: TB331
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- 被引次数: 0
出版历程
- 收稿日期: 2024-06-19
- 修回日期: 2024-08-27
- 录用日期: 2024-08-28
- 网络出版日期: 2024-09-18

Effect of Y on the microstructure and mechanical properties of WTaCrVTi high-entropy alloys

State Key Laboratory of Materials Processing and Die and Mould Technology, Huazhong University of Science and Tech-nology, Wuhan 430074, PR China

Funds: National Research Project on the Development of Magnetic Confinement Nuclear Fusion Energy (No. 2018YFE0306104); Open Research Fund of the State Key Laboratory of Materials Processing and Die & Mould Technology (No. P2023-024)

摘要

摘要: WTaCrVTi高熵合金具有良好的力学性能和抗辐照性能，且各组元具有低中子活化特性，可用于核聚变堆的中子辐照环境中，因此，该合金在核聚变堆中具有潜在的应用前景。但该合金在制备过程中易发生元素偏析和富集，造成组织结构不均匀，为了提高组织结构的均匀性，采用机械合金化法结合放电等离子体烧结技术制备了WTaCrVTi₆Y_x高熵合金，研究了Y对合金的组织结构和力学性能的影响。结果表明：未添加Y的合金包含固溶体、TiO、Laves相和富Ta相。具有BCC结构的固溶体为基体，其中W、Ta、Cr、V的原子比趋于等原子比；TiO颗粒的平均尺寸为1.08±0.38 μm，均匀分布在基体中；Laves相和富Ta相零星分布在基体中。而添加了6 at% Y的合金主要包含BCC结构的固溶体和Y₂O₃颗粒，Y₂O₃颗粒的平均尺寸约为1.25±0.85 μm，固溶体的W、Ta、Cr、V的原子比趋于1，该合金的室温压缩屈服强度和硬度达到分别为2674 MPa和848.6±9.3 HV。
- 高熵合金 /
- 机械合金化 /
- 放电等离子体烧结 /
- 微观结构 /
- 均匀性 /
- 力学性能
Abstract: WTaCrVTi high entropy alloys have excellent mechanical properties and irradiation resistance, and the individual components have low neutron activity, which can be used in the neutron irradiation environment of nuclear fusion reactors. Thus, they have potential applications in nuclear fusion reactors. However, elemental segregation and enrichment exist in the alloys during the preparation process, resulting in an inhomogeneous microstructure. In order to improve the homogeneity of the microstructures, mechanical alloying combined with spark plasma sintering was adopted to prepare WTaCrVTi₆Y_x high entropy alloys. The effects of Y content on the microstructure and mechanical properties of high-entropy alloys were explored. It is found that the alloys without Y addition include the solid solution, TiO particles, laves phases and Ta-rich phases. The solid solution with BCC structure is the matrix, and the atomic ratios of W, Ta, Cr and V are close to be equal. The TiO particles are uniformly distributed in the matrix with an average particle size of 1.08±0.38 μm. The laves and the Ta-rich phases are sporadically distributed in the matrix. While, the alloys with the addition of 6 at% Y is mainly composed of the solid solution with BCC structure and Y₂O₃ particles. The average size of Y₂O₃ particles is about 1.25 ± 0.85 μm. And the atomic ratios of W, Ta, Cr, and V in the BCC phase tend to be 1. The room-temperature compressive yield strength and hardness of this alloy reach 2674 MPa and 848.6 ± 9.3 HV, respectively.
- Refractory high-entropy alloy /
- Mechanical alloying /
- Spark plasma sintering /
- Microstructure /
- Homogeneous /
- Mechanical properties

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图 1 WTaCrVTi₆Y_x合金粉末的XRD图谱

Figure 1. XRD patterns of the WTaCrVTi₆Y_x alloy powders.

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图 2 WTaCrVTi₆Y_x合金粉末的SEM图像: (a) Y0, (b) Y2, (c) Y4, (d) Y6

Figure 2. SEM images of WTaCrVTi₆Y_x alloy powders: (a) Y0,(b) Y2, (c) Y4, (d) Y6

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图 3 WTaCrVTi₆Y_x高熵合金的XRD图谱

Figure 3. XRD patterns of WTaCrVTi₆Y_x high-entropy alloys.

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图 4 不同Y含量合金中BCC相的平均晶粒尺寸

Figure 4. Average grain size of BCC phase in the alloys with different Y contents.

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图 5 WTaCrVTi₆Y_x高熵合金的背散射SEM图像: (a) Y0, (b) Y2, (c) Y4, (d) Y6

Figure 5. BSE-SEM images of WTaCrVTi₆Y_xhigh entropy alloys: (a) Y0,(b) Y2, (c) Y4, (d) Y6.

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图 6 不同Y含量WTaCrVTi₆Y_x高熵合金断口的SEM图像: (a) Y0, (b) Y2, (c) Y4, (d) Y6

Figure 6. SEM images of WTaCrVTi₆Y_xhigh entropy alloys fractures with different Y contents: (a) Y0, (b) Y2, (c) Y4, (d) Y6.

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图 7 WTaCrVTi₆Y_x合金的EPMA图像: (a) Y0, (b) Y4, (c) Y6

Figure 7. EPMA Images of the WTaCrVTi₆Y_x alloy: (a) Y0, (b) Y4, (c) Y6.

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图 8 WTaCrVTi₆Y_x高熵合金力学性能: (a) 室温压缩性能, (b) 显微硬度

Figure 8. The mechanical properties of WTaCrVTi₆Y_x high entropy alloy: (a) room temperature compression properties, (b) microhardness.

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表 1 WTaCrVTi₆Y_x高熵合金中各个相的元素含量

Table 1. Elemental content of individual phases in WTaCrVTi₆Y_x high-entropy alloys

Alloy	Area	Element content (at%)							Phase
Alloy	Area	W	Ta	Cr	V	Ti	Y	O	Phase
Y0	A	24.49	24.36	24.54	24.55	2.06	0	0	Solid solution
	B	9.16	26.94	41.57	17.99	0.79	0	3.55	Laves
	C	1.08	1.42	2.98	6.81	38.11	0	49.60	TiO
	D	1.95	91.68	0.89	1.91	0.47	0	3.10	Ta
Y2	A	43.90	25.29	14.90	12.56	3.35	0	0	Solid solution
	B	8.47	34.01	36.47	18.93	2.12	0	0	Laves
	C	0	0	0	0	17.49	17.40	65.11	(Ti/Y)-O
Y4	A	30.84	28.21	19.27	16.26	5.42	0	0	Solid solution
	B	8.13	33.75	39.25	15.07	3.79	0	0	Laves
	C	0	0	0	0	0	38.86	61.14	Y₂O₃
Y6	A	25.12	24.94	22.03	23.66	4.25	0	0	Solid solution
Y6	C	0	0	0	0	0	39.14	60.85	Y₂O₃

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表 2 WTaCrVTi₆Y_x合金的密度

Table 2. Density of the WTaCrVTi₆Y_x alloys

Alloy	Y0	Y2	Y4	Y6
Actual density /(g/cm^-3)	12.398	12.026	11.706	11.399
Theoretical density /(g/cm^-3)	12.407	12.056	11.722	11.402
Relative density /(%)	99.9	99.8	99.8	99.9

下载: 导出CSV

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