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金属学报  2014, Vol. 50 Issue (7): 832-838    DOI: 10.3724/SP.J.1037.2013.00746
  论文 本期目录 | 过刊浏览 |
间隙原子C作用下TiAl合金中析出相的形成及演变规律*
周欢, 张铁邦, 吴泽恩, 胡锐, 寇宏超, 李金山
(西北工业大学凝固技术国家重点实验室, 西安 710072)
FORMATION AND EVOLUTION OF PRECIPITATE IN TiAl ALLOY WITH ADDITION OF INTERSTITIAL CARBON ATOM
ZHOU Huan, ZHANG Tiebang, WU Zeen, HU Rui, KOU Hongchao, LI Jinshan
State Key Laboratory of Solidification Processing, Northwestern Polytechnical University, Xi'an 710072
全文: PDF(5840 KB)   HTML
摘要: 

采用XRD, SEM及TEM分析研究间隙原子C作用下Ti-46Al-8Nb-xC (x=0, 0.7, 1.4, 2.5, 原子分数, %)合金中析出相的形成规律、析出相与基体相的位向关系及其在热处理过程中的演变规律. 结果表明, 在C含量为1.4%和2.5%的合金中有长条状Ti2AlC析出, 该析出相在铸锭制备的过程中形成, 在时效热处理中尺寸、数量和分布均无明显变化, 表现出较好的稳定性. 不同C含量合金经固溶处理和时效后析出细小针状的Ti3AlC, 该析出相从g相中析出, 并与γ相存在位向关系: , . 延长时效时间, Ti3AlC尺寸略有增大, 数量变化不明显; 升高时效温度, Ti3AlC的尺寸和数量均有显著增加.

关键词 间隙原子高Nb-TiAl合金碳化物演化位向关系    
Abstract:As promising light-weight high-temperature materials, g-TiAl base alloys are considered as prospective candidates for automobile and aerospace application due to their high specific yield strength. Adding Nb to TiAl alloys increases the liquidus temperature and results in improvents of creep resistance, high temperature strength and oxidation resistance. High Nb-containing TiAl alloys have attracted much attention during past decades. With the addition of carbon in Ti-46Al-8Nb-xC alloys (x=0, 0.7, 1.4, 2.5, atomic fraction, %), the formation of precipitates, the orientation relationship between precipitates and the TiAl matrix and the evolution of the precipitates during heat treatments have been investigated in this work by XRD, SEM and TEM. The results show that lath-shaped precipitates of Ti2AlC can be formed during the preparation of ingots with the addition of 1.4% and 2.5% of C. With good thermal stability, the size, amount and distribution of Ti2AlC precipitates remain almost stable during the aging process. Needle-shaped precipitates of Ti3AlC are formed in the aged alloys with 0.7%, 1.4% and 2.5% of C. And the precipitates are preferentially formed in g grains. The orientation relationship between Ti3AlC precipitates and g phase is found to be and . Meanwhile, the precipitation behavior and morphology of Ti3AlC are also discussed. Ti3AlC precipitates grow slightly after prolonged aging, while the amount of the precipitates remains small. With a higher aging temperature, the size of Ti3AlC precipitates increases significantly and an increasing amount of the precipitates is observed.
Key wordsinterstitial atom    high Nb-containing TiAl alloy    carbide    evolution    orientation relationship
收稿日期: 2013-11-19     
ZTFLH:  TG146.2  
基金资助:*国家自然科学基金项目51001086和 51371144及国家重点基础研究发展计划项目2011CB605503资助
Corresponding author: ZHANG Tiebang, associate professor, Tel: (029)88491764,
E-mail: tiebangzhang@nwpu.edu.cn   
作者简介: 周欢, 男, 1990年生, 硕士生

引用本文:

周欢, 张铁邦, 吴泽恩, 胡锐, 寇宏超, 李金山. 间隙原子C作用下TiAl合金中析出相的形成及演变规律*[J]. 金属学报, 2014, 50(7): 832-838.
ZHOU Huan, ZHANG Tiebang, WU Zeen, HU Rui, KOU Hongchao, LI Jinshan. FORMATION AND EVOLUTION OF PRECIPITATE IN TiAl ALLOY WITH ADDITION OF INTERSTITIAL CARBON ATOM. Acta Metall Sin, 2014, 50(7): 832-838.

链接本文:

https://www.ams.org.cn/CN/10.3724/SP.J.1037.2013.00746      或      https://www.ams.org.cn/CN/Y2014/V50/I7/832

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