L. E. Bodrova, E. Yu. Goida, A. B. Shubin, O. M. Fedorova
{"title":"Interaction of Dispersed Cobalt with Molten Copper under Low-Frequency Vibration","authors":"L. E. Bodrova, E. Yu. Goida, A. B. Shubin, O. M. Fedorova","doi":"10.1134/S0036029523110034","DOIUrl":null,"url":null,"abstract":"<p><b>Abstract</b>—The possibility of increasing the hardness of a Co–Cu binder in single-stage production of WC–Cu–Co composites using pre-solidification low-frequency vibration (LFV) is investigated. Cu–Co and WC–Cu–Co alloys are fabricated by reactive infiltration of liquid copper into uncompacted WC and Co powders under LFV of their compositions (80 Hz for 10 min at 1300–1350°C). Their phase and chemical compositions, structure, and hardness have been studied. We are the first to experimentally show that metastable formations (frozen immiscibility regions of two liquids) are the precursors of (Co) dendrites and have the same composition with them. The cobalt distribution over the height of Cu–Co alloy ingots and over phase components is shown to depend on the cobalt content, the effect of vibration, the geometric arrangement of initial component layers, and the temperature. The optimum conditions for achieving a uniform cobalt distribution over the melt have been determined. Cobalt is shown to ensure precipitation hardening of the Cu–Co metal binder due to the formation of (Cu) solid solutions already at the stage of synthesis of Cu–Co and WC–Cu–Co alloys. Moreover, the potential for additional hardening by subsequent heat treatment or by changing cooling conditions is still incompletely fulfilled.</p>","PeriodicalId":769,"journal":{"name":"Russian Metallurgy (Metally)","volume":"2023 11","pages":"1648 - 1656"},"PeriodicalIF":0.4000,"publicationDate":"2024-03-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Russian Metallurgy (Metally)","FirstCategoryId":"5","ListUrlMain":"https://link.springer.com/article/10.1134/S0036029523110034","RegionNum":0,"RegionCategory":null,"ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q4","JCRName":"METALLURGY & METALLURGICAL ENGINEERING","Score":null,"Total":0}
引用次数: 0
Abstract—The possibility of increasing the hardness of a Co–Cu binder in single-stage production of WC–Cu–Co composites using pre-solidification low-frequency vibration (LFV) is investigated. Cu–Co and WC–Cu–Co alloys are fabricated by reactive infiltration of liquid copper into uncompacted WC and Co powders under LFV of their compositions (80 Hz for 10 min at 1300–1350°C). Their phase and chemical compositions, structure, and hardness have been studied. We are the first to experimentally show that metastable formations (frozen immiscibility regions of two liquids) are the precursors of (Co) dendrites and have the same composition with them. The cobalt distribution over the height of Cu–Co alloy ingots and over phase components is shown to depend on the cobalt content, the effect of vibration, the geometric arrangement of initial component layers, and the temperature. The optimum conditions for achieving a uniform cobalt distribution over the melt have been determined. Cobalt is shown to ensure precipitation hardening of the Cu–Co metal binder due to the formation of (Cu) solid solutions already at the stage of synthesis of Cu–Co and WC–Cu–Co alloys. Moreover, the potential for additional hardening by subsequent heat treatment or by changing cooling conditions is still incompletely fulfilled.
期刊介绍：
Russian Metallurgy (Metally) publishes results of original experimental and theoretical research in the form of reviews and regular articles devoted to topical problems of metallurgy, physical metallurgy, and treatment of ferrous, nonferrous, rare, and other metals and alloys, intermetallic compounds, and metallic composite materials. The journal focuses on physicochemical properties of metallurgical materials (ores, slags, matters, and melts of metals and alloys); physicochemical processes (thermodynamics and kinetics of pyrometallurgical, hydrometallurgical, electrochemical, and other processes); theoretical metallurgy; metal forming; thermoplastic and thermochemical treatment; computation and experimental determination of phase diagrams and thermokinetic diagrams; mechanisms and kinetics of phase transitions in metallic materials; relations between the chemical composition, phase and structural states of materials and their physicochemical and service properties; interaction between metallic materials and external media; and effects of radiation on these materials.
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