Microstructure and Mechanical Properties of TiVNbTa Refractory High-Entropy Alloy Prepared by Powder Metallurgy

doi:10.11901/1005.3093.2018.742

Chinese Journal of Materials Research

2019, Vol. 33

Issue (8): 572-578 DOI: 10.11901/1005.3093.2018.742

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Microstructure and Mechanical Properties of TiVNbTa Refractory High-Entropy Alloy Prepared by Powder Metallurgy

Nan GAO^1,²,Yan LONG¹(

),Haiyan PENG^1,³,Weihua ZHANG¹,Liang PENG¹

1. Guangdong Provincial Key Laboratory for Processing and Forming of Advanced Metallic Materials, Sourth China University of Technology, Guangzhou 510640，China
2. China (Wuhan) Intellectual Property Protection Center, Wuhan 430023，China
3. Guangdong Polytechnic Normal University，Guangzhou 510635，China

Cite this article:

Nan GAO, Yan LONG, Haiyan PENG, Weihua ZHANG, Liang PENG. Microstructure and Mechanical Properties of TiVNbTa Refractory High-Entropy Alloy Prepared by Powder Metallurgy. Chinese Journal of Materials Research, 2019, 33(8): 572-578.

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Abstract

The TiVNbTa refractory high-entropy alloy (HEA) was fabricated by mechanical alloying (MA) and spark plasma sintering (SPS). The mechanically alloying process, phase composition and microstructure as well as the effect of sintering temperature, O- and N-content on the mechanical properties of the alloy were studied. The mechanically alloyed powders present a single BCC crystal structure, while the spark plasma sintered alloy composed of a FCC matrix with precipitated phases of TiN, TiC and TiO. The alloy sintered at 1100°C performed outstanding mechanical properties with compressive yield strength of 1506 MPa and plastic strain of 33.2%, respectively. As sintering temperature increased, the alloy fracture mechanism basically transformed from quasi-brittle fracture to ductile fracture, and finally to brittle fracture. The increase of O- and N-content had little effect on the strength of the alloy, but negative effect obviously on its plasticity.

Key words: metallic materials refractory high-entropy alloys mechanically alloying spark plasma sintering microstructure mechanical properties

Received: 04 January 2019

ZTFLH:

TG146

Fund: Supported by the Key Science and Technology Project of Guangdong Province(No. 2015A010105011)

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	Nan GAO
	Yan LONG
	Haiyan PENG
	Weihua ZHANG
	Liang PENG

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https://www.cjmr.org/EN/10.11901/1005.3093.2018.742 OR https://www.cjmr.org/EN/Y2019/V33/I8/572

Fig.1 XRD patterns of TiVNbTa alloy powders with different milling time

Fig.2 XRD patterns of TiVNbTa alloy sintered at different temperature

Fig.3 SEM Backscattering Morphology of TiVNbTa alloy sintered at 1100℃

Fig.4 TEM bright-field images of the TiVNbTa alloy, inset: SAED pattern corresponding to a BCC phase along [001] zone axis; SAED pattern corresponding to a FCC phase along [011] zone axis

Table 1 Chemical composition analysis results of bulk TiV-NbTa alloy by EDS/TEM (atomic fraction, %)

Fig.5 Compressive engineering stress-strain curves of the bulk TiVNbTa HEAs sintered at different temperatures

Fig.6 Fracture morphologies of bulk TiVNbTa sintered at different temperatures: (a, b) 900℃; (c) 1000℃; (d) 1100℃; (e)1200℃; (f) 1300℃

Table 2 The O, N content results of TiVNbTa alloy(atomic fraction, %)

Fig.7 Metallographic microstructures of HEA1: (a) 1100℃; (b) 1200℃; (c) 1300℃ and HEA2: (d) 1100℃; (e) 1200℃; (f)1300℃

Fig.8 Comparison of mechanical properties of HEA1 and HEA2 (a) yield strengths；(b) plastic strains

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