Synergistic effect of NiB/Co variation on microstructural evolution, shape distortion, mechanical, and thermal properties of 90W-10(NiB-Co) alloys

IF 4.6 2区材料科学 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY

International Journal of Refractory Metals & Hard Materials Pub Date : 2025-10-24 DOI:10.1016/j.ijrmhm.2025.107511

Deepak Adhikari , Pradyut Sengupta , Mayadhar Debata

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Abstract

The present investigation delves into the vital role of NiB and Co ratio on the sintered densification, phase, microstructure, distortion, mechanical, and thermal characteristics of 90W-xNiB-(10-x)Co alloys. The sintered density of the alloys showed an upward trend with an increase in the NiB/Co ratio. The phase analysis confirmed W-containing intermetallic formation in the sintered alloys. FESEM micrographs depicted the prevalence of a third phase or W-rich phases along with W and matrix phases. The grain size of W and the grain growth rate were found to increase with an increase in the NiB/Co ratio. EPMA analysis was also carried out to get a deeper insight into the distribution of the elements in W-rich intermetallics. The highest compressive strength of ∼1672 MPa was obtained in the W alloys with a NiB/Co ratio of 5, whereas the highest tensile strength of ∼710 MPa was offered by W-alloys with NiB/Co of 2. The maximum bulk hardness of 462 ± 36 HV₃ was obtained in W-alloys with the NiB/Co ratio of 1. It was noticed that with an increase in the NiB/Co ratio, the shape distortion of the investigated alloys was prevented. The W-alloy with a NiB/Co ratio = 2 resulted in the lowest coefficient of thermal expansion.

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NiB/Co变化对90W-10（NiB-Co）合金组织演变、形状变形、力学和热性能的协同效应

本研究探讨了NiB和Co配比对90W-xNiB-(10-x)Co合金烧结致密化、相、显微组织、变形、力学和热特性的重要作用。随着NiB/Co比的增加，合金的烧结密度呈上升趋势。物相分析证实了烧结合金中存在含w的金属间化合物。FESEM显微照片描绘了第三相或富W相以及W和基体相的普遍存在。随着NiB/Co比的增大，W的晶粒尺寸和晶粒生长速率增大。为了更深入地了解富w金属间化合物中元素的分布，还进行了EPMA分析。NiB/Co比值为5的W合金抗压强度最高，为~ 1672 MPa，而NiB/Co比值为2的W合金抗拉强度最高，为~ 710 MPa。当NiB/Co比为1时，w合金的最大体硬度为462±36 HV3。结果表明，随着NiB/Co比的增加，合金的形状变形得到了抑制。当NiB/Co = 2时，w合金的热膨胀系数最低。

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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.