2相顆粒和片層組織；輥速進一步增加至30m/s時,基體轉(zhuǎn)變?yōu)棣?sub>2相,片層組織消失?？焖倌蘐i-48Al-4Cr納米硬度隨著冷卻速度的增加而增加,納米硬度由常規(guī)凝固時的5.04±0.09GPa增加至輥速為30m/s時的10.48±0.13GPa。該結(jié)果為研究TiAl合金組織轉(zhuǎn)變,減小TiAl合金偏析,提高其力學性能提供了基礎(chǔ)。"/>

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冷卻速度對快速凝固Ti-48Al-4Cr合金組織轉(zhuǎn)變規(guī)律及力學性能研究
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作者單位:

衢州學院,衢州學院,衢州學院,衢州學院,衢州學院,哈爾濱工業(yè)大學,哈爾濱工業(yè)大學

作者簡介:

通訊作者:

中圖分類號:

TG146.2

基金項目:

國家自然科學資助(項目號51501100)衢州市科技計劃項目資助(項目號2014Y014)


Effect of cooling rates on microstructures evolution and nanohardnessof rapidly solidified Ti-48Al-4Cr alloy
Author:
Affiliation:

School of Mechanical Engineering,Quzhou University,School of Mechanical Engineering,Quzhou University,School of Mechanical Engineering,Quzhou University,School of Mechanical Engineering,Quzhou University,School of Mechanical Engineering,Quzhou University,School of Materials Science and Engineering,Harbin Institute of Technology,School of Materials Science and Engineering,Harbin Institute of Technology

Fund Project:

the Equipment Function Developing and Technical Innovation Project of the Chinese Academy of Sciences (Y25ZB13291); National Magnetic Confinement Fusion Science Program (2011GB112004)

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    摘要:

    采用單輥旋淬快速凝固設(shè)備制備了不同輥速條件下的Ti-48Al-4Cr(at.%)薄帶,研究冷卻速度對快速凝固Ti-48Al-4Cr合金的組織及力學性能變化規(guī)律。結(jié)果表明,快速凝固Ti-48Al-4Cr合金凝固在輥速為10m/s和20m/s時,基體為等軸的γ相,基體中含有少量的B2相、α2相顆粒和片層組織；輥速進一步增加至30m/s時,基體轉(zhuǎn)變?yōu)棣?sub>2相,片層組織消失?？焖倌蘐i-48Al-4Cr納米硬度隨著冷卻速度的增加而增加,納米硬度由常規(guī)凝固時的5.04±0.09GPa增加至輥速為30m/s時的10.48±0.13GPa。該結(jié)果為研究TiAl合金組織轉(zhuǎn)變,減小TiAl合金偏析,提高其力學性能提供了基礎(chǔ)。

    Abstract:

    In this work the effect of cooling rates on microstructure of Ti-48Al-4Cr(at.%) alloy rapidly solidified at different wheel speeds were experimentally investigated by using the single roller melt-spinning technique. The results indicate that after rapid solidification at the wheel speed of 10m/s and 20m/s, the microstructures mainly consist of equiaxed γ phase, few volume fraction of α2, B2 phase particles and lamellar structures exists in the γ phase matrix. At the wheel speed of 30m/s, the matrix changes to α2 phase and the lamellar structures disappear. The nanohardness increases with the cooling rate increasing. It enhances from 4.98±0.10GPa under normal pressure to 7.48±0.16GPa under 4GPa. The nanohardness increases from 5.04±0.09GPa of conventional cast Ti-48Al alloy to 10.48±0.13GPa of rapidly solidified Ti-48Al-4Cr alloy with the wheel speed of 30m/s. This research has provided the basis of further studying on the microstructures, reducing the segregation and enhancing the mechanical properites of TiAl alloy.

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朱冬冬,董多,周兆忠,倪成員,賀慶,王宏偉,魏尊杰.冷卻速度對快速凝固Ti-48Al-4Cr合金組織轉(zhuǎn)變規(guī)律及力學性能研究[J].稀有金屬材料與工程,2016,45(7):1745~1748.[Zhu Dongdong, Dong duo, Zhou Zhaozhong, Ni Chengyuan, He Qing, Wang Hongwei, Wei Zunjie. Effect of cooling rates on microstructures evolution and nanohardnessof rapidly solidified Ti-48Al-4Cr alloy[J]. Rare Metal Materials and Engineering,2016,45(7):1745~1748.]
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  • 收稿日期:2015-09-08
  • 最后修改日期:2015-11-14
  • 錄用日期:2015-12-08
  • 在線發(fā)布日期: 2016-10-09
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