Enhanced properties of a WMoTaTi refractory high entropy alloy via a face-centered cubic phase

IF 4.2 2区材料科学 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY

International Journal of Refractory Metals & Hard Materials Pub Date : 2025-03-21 DOI:10.1016/j.ijrmhm.2025.107157

Chang Liu , Keyan Zhu , Muhammad Dilawer Hayat , Jianan Chen , Wangwang Ding , Gang Chen , Lin Zhang , Mingli Qin , Xuanhui Qu

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引用次数: 0

Abstract

Refractory high entropy alloys (RHEAs) are gaining widespread attention recently due to their excellent high-temperature properties. In this study, a WMoTaTi RHEA was fabricated by laser-based powder bed fusion of metals. The microstructure features with nanosized semi-coherent ductile face-centered cubic titanium (Ti_FCC) precipitates in the body-centered cubic (BCC) matrix. The oxygen enrichment and significant thermal stresses induced by the PBF-LB/M process contributed to the formation of Ti_FCC precipitates. The semi-coherent Ti_FCC/matrix interface and the ductile nature of Ti_FCC reduced the cracking defects and greatly improved the printability of the WMoTaTi RHEA, while retaining excellent high-temperature performance. The compressive strengths of the as-printed WMoTaTi RHEA at 25, 1000 and 1600 °C are 1251.2 ± 19.5 MPa, 1159.3 ± 10.6 MPa and 96.4 ± 4.3 MPa, with the compressive strains of 6.7 ± 1.1 %, 18.3 ± 2.3 % and >30.0 %, respectively. The nanoscale Ti_FCC phase underwent a transformation-induced plasticity (TRIP) process from Ti_FCC to hexagonal close-packed Ti (Ti_HCP). The solid solution and secondary phase precipitates mainly contributed to the high strength, and the TRIP effect led to substantial plasticity at elevated temperatures for the as-printed WMoTaTi RHEA. This work offers a novel avenue for designing RHEAs with well printability and desirable performance.

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来源期刊

$International Journal of Refractory Metals & Hard Materials$

International Journal of Refractory Metals & Hard Materials 工程技术-材料科学：综合

CiteScore

7.00

自引率

13.90%

发文量

236

审稿时长

35 days

期刊介绍： The International Journal of Refractory Metals and Hard Materials (IJRMHM) publishes original research articles concerned with all aspects of refractory metals and hard materials. Refractory metals are defined as metals with melting points higher than 1800 °C. These are tungsten, molybdenum, chromium, tantalum, niobium, hafnium, and rhenium, as well as many compounds and alloys based thereupon. Hard materials that are included in the scope of this journal are defined as materials with hardness values higher than 1000 kg/mm2, primarily intended for applications as manufacturing tools or wear resistant components in mechanical systems. Thus they encompass carbides, nitrides and borides of metals, and related compounds. A special focus of this journal is put on the family of hardmetals, which is also known as cemented tungsten carbide, and cermets which are based on titanium carbide and carbonitrides with or without a metal binder. Ceramics and superhard materials including diamond and cubic boron nitride may also be accepted provided the subject material is presented as hard materials as defined above.