鋳造用ベリリウム銅合金の結晶粒微細化について
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概要
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The effect of cobalt addition on the grain refining of copper beryllium alloy for castings was studied. For this the liquidus part of Cu-Be-Co phase diagram was investigated to clarify the range in which grain size of the alloy was refined by adjusting the ratio of beryllium to cobalt, by using thermal analysis, microscopic and X-ray microanalytic observation. Experimental results were : 1) The grain refining of the alloys was caused due to the peritecto-eutectic reaction of Cu-Be-Co ternary alloys. There were found five primary crystals including Cu-, Co-, β-, BeCo- and X-phase in that range of alloys investigated. 2) In the copper rich part of the ternary alloy diagram there were two eutectic lines on which coarse grains were produced. One consisted of liquid, alpha Co and BeCo, the other consisting of liquid, BeCo and X-phase. The former started from a point of Be1%, Co1.6% and the rest Cu, while the other started from a point of Be4.3%, Co1.7% and the rest Cu. 3) There took place two non-variant reactions, one of which is given by Liquid+(Co)⇌(Cu)+BeCo, and the other is shown by Liquid+X-phase⇌β-phase+BeCo. The former occurred at about 1,031°C and a chemical composition of Be1%, Co1.6% and the rest Cu, the latter occurring at about 866°C and composition of Be4.3%, Co1.6% and the rest Cu. 4) The range of chemical composition in which fine grains were produced can be shown by F1 and F2 in the phase diagram in Fig. 21.
- Japan Foundry Engineering Societyの論文
Japan Foundry Engineering Society | 論文
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