Nuclear Techniques ›› 2017, Vol. 40 ›› Issue (3): 30203-030203.doi: 10.11889/j.0253-3219.2017.hjs.40.030203

• LOW ENERGY ACCELERATOR, RAY AND APPLICATIONS • Previous Articles     Next Articles

Ion-irradiation-induced hardening in alloys of V-4Cr-4Ti and V-5Cr-5Ti

YAN Tingxing1,2, YANG Yitao1, MA Tongda3, ZHANG Chonghong1, FAN Jiaqi1, DING Zhaonan1, SONG Yin1   

  1. 1. Institute of Modern Physics, Chinese Academy of Sciences, Lanzhou 730000, China;
    2. University of Chinese Academy of Sciences, Beijing 100049, China;
    3. National Center of Analysis and Testing for Nonferrous Metals and Electronic Materials, General Research Institute for Nonferrous Metals, Beijing 100088, China
  • Received:2016-10-09 Revised:2016-11-08 Online:2017-03-10 Published:2017-03-11
  • Supported by:

    Supported by National Natural Science Foundation of China (No.U1532262), National Magnetic Confinement Fusion Energy Research and Development Program (No.2011GB108003)

Abstract:

Background: Vanadium alloy (V-Cr-Ti) is an important fusion reactor candidate material due to its low activation characteristics, desirable high-temperature strength and good resistance to radiation damage. However, studies at lower temperature have shown a substantially reduced radiation resistance, manifested in a loss of ductility and enhanced hardening. Purpose: This work aims to investigate the irradiation hardening behavior of vanadium alloys under He-ion implantation and displacement damage, and provide an experimental evidence for optimizing the radiation resistance of vanadium alloys. Methods: In this study, irradiation of V-4Cr-4Ti alloy and V-5Cr-5Ti alloy samples were carried out with He-ions and swift-heavy-ions. A thick layer with a uniform damage distribution in samples was produced by varying energy of He ions, or by using an energy degrade wheel for swift-heavy-ion irradiation. The nanoindentation technique was used to measure the irradiation hardening. Cross-sectional transmission electron microscopy (TEM) sample fabricated from the irradiated samples were investigated with TEM. Results: The results show that the hardening saturation occurs when the dose of He-ion implantation is more than 4 200 (Atomic parts per million, APPM)/0.2 (Displacement per atom, DPA). The irradiation hardening by He-ions is far larger than that by the swift-heavy-ions at the same displacement damage level. Conclusion: The phenomenon of the enhanced hardening by He-ions can be attributed to the accelerated formation of defect clusters due to the combination of He-atoms and vacancies.

Key words: V-4Cr-4Ti, V-5Cr-5Ti, Irradiation damage, Irradiation hardening

CLC Number: 

  • TL99