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B和Y對(duì)高鈮TiAl合金組織和拉伸性能的影響
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1.天津中德應(yīng)用技術(shù)大學(xué) 機(jī)械工程學(xué)院，天津 300350;2.北京工業(yè)大學(xué) 材料科學(xué)與工程學(xué)院，北京 100124

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基金項(xiàng)目:

the National Natural Science Foundation of China (No. 51301005) and the Tianjin Education Commission Scientific Research Project (No. 2019KJ139)


Effects of B and Y Additions on the Microstructure and Tensile Behaviour of High-Nb TiAl Alloys
Author:
Affiliation:

1.School of Mechanical Engineering, Tianjin Sino-German University of Applied Sciences, Tianjin 300350, China;2.College of Materials Science and Engineering, Beijing University of Technology, Beijing 100124, China

Fund Project:

National Natural Science Foundation of China (51301005); Tianjin Education Commission Scientific Research Project (2019KJ139)

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    摘要:

    研究了B和Y對(duì)Ti45Al8Nb0.2W0.25Cr (at%) 合金的微觀結(jié)構(gòu)、微觀偏析和拉伸行為的影響。結(jié)果表明，高鈮TiAl合金中的β相穩(wěn)定元素促進(jìn)了微觀偏析區(qū)域中γ相以及大塊狀微觀偏析區(qū)域的形成。具有低比表面積的大塊狀微偏析區(qū)域降低了微偏析界面處的空洞和裂紋的成核率，明顯降低了晶界處的強(qiáng)度和合金的抗拉強(qiáng)度。B和Y的添加明顯的細(xì)化了片層團(tuán)，增加了片層團(tuán)處空洞成核的機(jī)會(huì)，從而提高了變形抗力。分析了2種合金的拉伸機(jī)理。

    Abstract:

    The influence of B and Y on the microstructure, microsegregation, and tensile behaviour of the Ti45Al8Nb0.2W0.25Cr (at%) alloy was investigated. The β-stabilizer elements in the high-Nb TiAl alloy promote the formation of the γ phase in the microsegregation region and lead to the formation of large blocky microsegregation areas. The large blocky microsegregation regions with low specific surface areas reduce the nucleation rate of cavities and cracks at the interfaces of the microsegregation, which are harmful to colony boundary strengthening and decrease tensile resistance. The addition of B and Y affords an obvious refinement in the lamellar colony, renders an increasing opportunity for cavity nucleation at the colony boundary, and thus improves the tensile resistance. The tensile mechanisms of the alloys before and after (B, Y) addition were also compared and analysed.

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宮子琪,武晉,孫偉,陳子勇,聶祚仁.B和Y對(duì)高鈮TiAl合金組織和拉伸性能的影響[J].稀有金屬材料與工程,2021,50(8):2760~2764.[Gong Ziqi, Wu Jin, Sun Wei, Chen Ziyong, Nie Zuoren. Effects of B and Y Additions on the Microstructure and Tensile Behaviour of High-Nb TiAl Alloys[J]. Rare Metal Materials and Engineering,2021,50(8):2760~2764.]
DOI：10.12442/j. issn.1002-185X.20200432

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歷史
  • 收稿日期:2020-06-19
  • 最后修改日期:2020-08-22
  • 錄用日期:2020-08-28
  • 在線發(fā)布日期: 2021-09-07
  • 出版日期: 2021-08-31