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李志平,骆良顺,孙雄凯,杨慧敏,刘桐,王亮,张东徽,苏彦庆,郭景杰,傅恒志.热稳定处理时间对TNM合金糊状区组织的影响[J].稀有金属材料与工程(英文),2020,49(11):3938~3942.[Li Zhiping,Luo Liangshun,Sun Xiongkai,Yang Huimin,Liu Tong,Wang Liang,Zhang Donghui,Su Yanqing,Guo Jingjie and Fu Hengzhi.Effect of Thermal Stabilization Time on Microstructure of Mushy Zone of TNM Alloy[J].Rare Metal Materials and Engineering,2020,49(11):3938~3942.]
Effect of Thermal Stabilization Time on Microstructure of Mushy Zone of TNM Alloy
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Received:November 29, 2019  Revised:March 13, 2020
DOI:
Key words: TNM Alloy  Thermal Stabilization Time  Mushy Zone  Microstructure  Structure Evolution
Foundation item:国家重点研发计划项目(2016YFB0301201);国家自然科学(51671073);云南省重大科技专项计划(2018ZE002);云南稀贵金属材料基因工程一期项目(2018ZE013)
Author NameAffiliation
Li Zhiping,Luo Liangshun,Sun Xiongkai,Yang Huimin,Liu Tong,Wang Liang,Zhang Donghui,Su Yanqing,Guo Jingjie and Fu Hengzhi  
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Abstract:
      In this paper, the ingots of TNM alloy(Ti-44Al-4Nb-1Mo-0.1B at.%) were obtained using a non-consumable electric arc melting furnace. As-cast microstructure of TNM alloy was investigated. Liquid metal cooling Bridgman-type apparatus was employed in the heat stabilization experiment of TNM alloy and the effect of thermal stabilization time on the mushy zone of TNM alloy during directional solidification has been investigated. The results show the as-cast microstructure of TNM alloy consists of a major of (α2+γ) lamellar colonies, network-like B2 phase, small γ phase and boride located at the interface of colonies. With the thermal stabilization time increasing, the solid/liquid interface will come to a planar one and the field of temperature and solute in the melt in front of solid/liquid interface will become more homogenous in thermal stabilization test. However, overmuch thermal stabilization time will make the melt contaminated by the crucible. The study shows the thermal stabilization time of 30~60 min is sufficient to provide a planar starting interface for directional solidification. Thermal stabilization affects the distribution of Al in solid and liquid phases near the solid/liquid interface of TNM alloy, and further affects the distribution of borides.