Microstructure and mechanical characterizations of liquid phase sintered W-Ni-Cu heavy alloy modified with La2O3 and Fe addition

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

International Journal of Refractory Metals & Hard Materials Pub Date : 2024-11-26 DOI:10.1016/j.ijrmhm.2024.106981

Navindra Shekhar Shakunt, Gouthama, Anish Upadhyaya

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引用次数: 0

Abstract

A novel tungsten heavy alloy (WHA), with composition 89 W-5.1Ni-3.4Cu-1.5Fe-1La₂O₃ (wt%) (Modified WHA) and the Ni/Cu ratio of 6/4, was sintered at 1400 °C for 1 h. The synergetic effects of La₂O₃ dispersion strengthening, which controls W particle growth, and Fe solid solution strengthening within the matrix, enhancing the compressive and bending strength of modified WHA. Microstructural analysis showed tungsten particle size and contiguity of 21 μm and 0.41, while mechanical testing revealed substantial improvements, with a hardness of 343 HV₅, compressive strength of 2250 MPa, and bending strength of 1417 MPa. Fractography indicated failure modes involving WW and W-matrix de-cohesion, transgranular fractures, and dimpled fractures, attributed to the combined strengthening mechanisms. Transmission electron microscopy (TEM) analysis provided detailed insights into the sintered alloys, particularly revealing the locations of La₂O₃, WW, and W-matrix interfaces, as well as the distribution of precipitates within the matrix and tungsten. This study demonstrates that the tailored addition of La₂O₃ and Fe significantly enhances WHA properties, positioning this alloy as a robust candidate for high-strength applications.

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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.