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王洪强,李双明.TGZM效应下Co-87.9wt%Sb合金糊状区的组织演化及成分变化[J].稀有金属材料与工程(英文),2017,46(10):3091~3097.[wanghongqiang and li shuang ming.MICROSTRUCTURE EVOLUTION AND COMPOSITION VARIATION IN MUSHY ZONE OF CO-87.9wt%SB ALLOY UNDER TGZM EFFECT[J].Rare Metal Materials and Engineering,2017,46(10):3091~3097.]
MICROSTRUCTURE EVOLUTION AND COMPOSITION VARIATION IN MUSHY ZONE OF CO-87.9wt%SB ALLOY UNDER TGZM EFFECT
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Received:July 19, 2016  Revised:September 28, 2016
DOI:
Key words: TGZM effect  Co-Sb alloy  mushy zone  CoSb3
Foundation item:陕西省自然科学基金 凝固实验室自主课题 凝固技术国家重点实验室(西北工业大学)自主研究课题
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wanghongqiang and li shuang ming  
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Abstract:
      Based on TGZM (temperature gradient zone melting) effect ,experiments on Co-87.9wt%Sb alloy consisting of melting followed by thermal stabilization ranging from 20min,2h,4h and quenching were carried out in a directional solidification apparatus, after which the solidified phases and the composition distribution were researched. The results showed that, under the temperature gradient, there exists a mushy zone between the complete liquid zone and the non-melted solid zone. Along the direction of the temperature gradient, the mushy zone of Co-87.9wt%Sb alloy is divided into three parts including (CoSb3+L),(CoSb2+L) and (CoSb+L). Due to TGZM effect, the volume fraction of the liquid phase in the mushy zone gradually decreases and the interface between the mushy zone and the complete liquid zone moves towards the low-temperature zone as thermal stabilization time increases. According to the composition distribution of the mushy zone, after thermal stabilization, the solute concentration obviously deviates from the initial concentration of Co-87.9wt%Sb alloy which is smaller than that of the complete liquid zone. Theoretical analysis and computation explain the above experimental observations. After 4h thermal stabilization, the volume fraction of CoSb3 in (CoSb3+L) of the mushy zone increases significantly up to 98.8%, which shows that it is feasible to prepare CoSb3 material via TGZM effect.
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