Interaction of Dispersed Cobalt with Molten Copper under Low-Frequency Vibration

IF 0.4 Q4 METALLURGY & METALLURGICAL ENGINEERING
L. E. Bodrova, E. Yu. Goida, A. B. Shubin, O. M. Fedorova
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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.

Abstract Image

低频振动下分散钴与熔融铜的相互作用
摘要 研究了在单级生产 WC-Cu-Co 复合材料过程中使用预凝固低频振动 (LFV) 提高 Co-Cu 粘结剂硬度的可能性。Cu-Co 和 WC-Cu-Co 合金是在低频振动(80 Hz,10 分钟,1300-1350°C)条件下,通过将液态铜反应渗入未压实的 WC 和 Co 粉末中制成的。我们对它们的相和化学成分、结构和硬度进行了研究。我们首次通过实验证明,钴枝晶的前驱体是(Co)枝晶的可转移形态(两种液体的冻结不溶区),并且与(Co)枝晶具有相同的成分。研究表明,钴在铜钴合金铸锭高度和相成分上的分布取决于钴含量、振动效应、初始成分层的几何排列和温度。确定了在熔体上实现均匀钴分布的最佳条件。钴在铜-钴和 WC-Cu-Co 合金的合成阶段就已形成(铜)固溶体,从而确保了铜-钴金属粘合剂的沉淀硬化。此外,通过后续热处理或改变冷却条件实现额外硬化的潜力仍未完全发挥出来。
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来源期刊
Russian Metallurgy (Metally)
Russian Metallurgy (Metally) METALLURGY & METALLURGICAL ENGINEERING-
CiteScore
0.70
自引率
25.00%
发文量
140
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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