2, 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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Effect of cooling rates on microstructures evolution and nanohardnessof rapidly solidified Ti-48Al-4Cr alloy
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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

Clc Number:

TG146.2

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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    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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[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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History
  • Received:September 08,2015
  • Revised:November 14,2015
  • Adopted:December 08,2015
  • Online: October 09,2016
  • Published: