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,2017,46(10):3091~3097.[wanghongqiang,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.]
TGZM效应下Co-87.9wt%Sb合金糊状区的组织演化及成分变化
投稿时间:2016-07-19  修订日期:2016-09-28
中文关键词:  TGZM效应  Co-Sb合金  糊状区  CoSb3
基金项目: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
中文摘要:
      以TGZM效应为理论基础,将Co-87.9wt%Sb合金置于定向凝固设备中加热熔化,在一定温度梯度下分别保温20min,2h,4h后淬火,对其糊状区的凝固组织和成分分布进行了研究。结果表明:在一定温度梯度下,介乎于完全液相区和未熔固相区之间存在着固液相共存的糊状区,Co-87.9wt%Sb合金的糊状区沿温度梯度方向分为(CoSb3+L),(CoSb2+L)以及(CoSb+L)三层;在TGZM效应作用下,随着保温时间的增加,糊状区内液相体积分数逐渐减少,糊状区与完全液相区界面向低温区移动;经保温处理后,由EDS获得的糊状区成分分布,糊状区内的溶质浓度明显偏离合金初始浓度,完全液相区溶质浓度高于初始值;通过理论分析与计算解释了上述现象。经过4h保温处理后,糊状区(CoSb3+L)部分中的CoSb3含量大幅增加,在该部分高温端甚至可达98.8%,表明借助TGZM效应经过长时间保温制备CoSb3热电材料的方法是可行的。
MICROSTRUCTURE EVOLUTION AND COMPOSITION VARIATION IN MUSHY ZONE OF CO-87.9wt%SB ALLOY UNDER TGZM EFFECT
英文关键词:TGZM effect  Co-Sb alloy  mushy zone  CoSb3
英文摘要:
      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.
作者单位E-mail
王洪强 西北工业大学材料学院 1078914056@qq.com 
李双明 西北工业大学材料学院 lsm@nwpu.edu.cn 
摘要点击次数: 52
全文下载次数: 22
查看全文  查看/发表评论  下载PDF阅读器
关闭