Spherical powder preparation and selective laser melting of TiVNbTa refractory high-entropy alloy

被引：0

作者：

Long Y. ^{[1
]}

Jiang Z. ^{[1
]}

Yang J. ^{[1
]}

Peng H. ^{[2
]}

Meng W. ^{[1
]}

Wang F. ^{[1
]}

机构：

[1] National Engineering Research Center of Net-Shape Forming for Metallic Materials, School of Mechanical and Automotive Engineering, South China University of Technology, Guangzhou

[2] School of Mechatronic Engineering, Guangdong Polytechnic Normal University, Guangzhou

来源：

Zhongguo Youse Jinshu Xuebao/Chinese Journal of Nonferrous Metals | 2024年 / 34卷 / 04期

关键词：

hydrogenation-dehydrogenation; mechanical property; microstructure; plasma spheroidization; selective laser melting; TiVNbTa refractory high-entropy alloy;

D O I：

10.11817/j.ysxb.1004.0609.2023-44565

中图分类号：

学科分类号：

摘要：

TiVNbTa refractory high-entropy alloy spherical powder was successfully prepared using hydrogenation-dehydrogenation, ball milling and plasma spheroidization techniques. Subsequently, using the spheroidized powder, the TiVNbTa refractory high-entropy alloy bulk samples were fabricated via the selective laser melting (SLM) process. The microstructure and mechanical properties of the samples were analyzed to investigate the impact of different SLM process parameters. The results reveal that the spheroidized powder, with an average particle size of 48 μm, exhibits excellent dispersion and good sphericity; the SLM-deposited alloy has ultrafine-grained microstructure, characterized by a cellular zone in the center of the melting pool and a columnar zone at the pool edges. Increasing the laser power results in a relatively stable compression yield strength, while decreasing the plastic strain. However, increasing the scanning speed leads to continual decreases in both compression yield strength and plastic strain. The alloy deposited at a laser power of 175 W and scanning speed of 400 mm/s exhibits the lowest porosity. Specifically, the porosity values are 0.26% and 1.42% in the XOY and YOZ planes, respectively. The compression yield strength (σ0.2) of the sample reaches 1001 MPa, the compressive strength (σbc) reaches1741 MPa, and the plastic strain (εp) reaches 10.0%. © 2024 Central South University of Technology. All rights reserved.

引用

页码：1140 / 1153

页数：13

共 21 条

[1] HAN Z, CHEN N, ZHAO S, Et al., Effect of Ti additions on mechanical properties of NbMoTaW and VNbMoTaW refractory high entropy alloys[J], Intermetallics, 84, (2017)
[2] OTTO F, DLOUHY A, SOMSEN C, Et al., The influences of temperature and microstructure on the tensile properties of a CoCrFeMnNi high-entropy alloy, Acta Materialia, 61, 15, (2013)
[3] GLUDOVATZ B, HOHENWARTER A, CATOOR D, Et al., A fracture-resistant high-entropy alloy for cryogenic applications[J], Science, 345, 6201, (2014)
[4] MING K, BI X, WANG J., Microstructures and deformation mechanisms of Cr26Mn20Fe20Co20Ni14 alloys, Materials Characterization, 134, (2017)
[5] JOO S H, KATO H, JANG M J, Et al., Structure and properties of ultrafine-grained CoCrFeMnNi high-entropy alloys produced by mechanical alloying and spark plasma sintering, Journal of Alloys and Compounds, 698, (2017)
[6] DING Q, ZHANG Y, CHEN X, Et al., Tuning element distribution, structure and properties by composition in high-entropy alloys[J], Nature, 574, 7777, (2019)
[7] FU Z, JIANG L, WARDINI J L, Et al., A high-entropy alloy with hierarchical nanoprecipitates and ultrahigh strength, Science Advances, 4, 10, (2018)
[8] GAO N., Preparation, microstructure and mechanical properties of powder metallurgy TiVNbTa (Al) refractory high entropy alloys, (2018)
[9] HAN J S, WU Y Z, MENG J H, Et al., Preparation of MoNbTaW refractory high-entropy alloys by spark plasma sintering, Rare Metal Materials and Engineering, 48, 6, (2019)
[10] ZHANG J X, LIU K G, ZHOU M L., Development and application of spark plasma sintering, Powder Metallurgy Technology, 20, 3, (2002)

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