Ti-Al-Nb三元系1 100 ℃等温截面的研究

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摘要采用电弧熔炼法制备17个不同成分的Ti-Al-Nb三元合金样品,在1 100 ℃退火1 080 h后取出,在冰水中淬火。利用扫描电镜(SEM)、电子探针(EPMA)和X射线衍射(XRD)等手段对退火后的合金样品进行分析,研究Ti-Al-Nb三元系1 100 ℃等温截面,确定该截面下(Al摩尔分数为0~75%成分区间)的9个单相区、15个两相区和7个三相区,并与Witusiewicz与Cupid的优化计算结果进行比较。结果表明,本研究所得1 100 ℃等温截面的Al摩尔分数为30%~60%的成分区间与Witusiewicz和Cupid的计算结果存在明显差异。采用实验方法确定了Ti-Al-Nb三元系1 100 ℃等温截面与计算结果不同的α₂+β+γ和β+γ+σ两个三相区以及β+γ两相区。

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	李林
	刘立斌
	章立钢

关键词 ： TiAl合金, 金属间化合物, 相图, 微观结构, 等温截面

Abstract：Seventeen Ti-Al-Nb alloy samples were prepared by arc melting, annealing at 1 100 ℃ for 1 080 h, quenching in ice water. Isothermal section of Ti-Al-Nb ternary system at 1 100 ℃ were studied using X-ray diffraction (XRD), scanning electron microscopy (SEM) and electron probe microanalysis (EPMA). Nine single-phase regions, fifteen two-phase regions and seven three-phase regions under the section (0-75%Al composition interval) were identified. The results show that, compared with the isothermal section of 1 100 ℃ obtained from the optimized calculation results of Witusiewicz and Cupid, there is a significant difference between experimental results (30-60%Al composition intervals) and the calculated results. The experimental results show that two three-phase α₂+β+γ and β+γ+σ regions and a two-phase β+γ region of the isothermal section of 1 100 ℃ are different from the calculated results.

Key words： TiAl alloy intermetallics phase diagram microstructure isothermal section

收稿日期: 2017-12-21 出版日期: 2019-07-12

ZTFLH:

TG146.4⁺16

基金资助:科技部重大专项(2016YFB0701301)

通讯作者: 刘立斌,教授,博士。电话：0731-88877732;E-mail: lbliu@csu.edu.cn

引用本文:

李林, 刘立斌, 章立钢. Ti-Al-Nb三元系1 100 ℃等温截面的研究[J]. 粉末冶金材料科学与工程, 2018, 23(4): 341-346.
LI Lin, LIU Libin, ZHANG Ligang. Study on isothermal section of Ti-Al-Nb ternary system at 1 100 ℃. Materials Science and Engineering of Powder Metallurgy, 2018, 23(4): 341-346.

链接本文:

http://pmbjb.csu.edu.cn/CN/ 或 http://pmbjb.csu.edu.cn/CN/Y2018/V23/I4/341

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